Text

NAC International, Submittal of SAR, Revision 18C for the STC, Non-Proprietary Version, (Redacted)
	ML19002A314
Person / Time
Site:	07109235
Issue date:	04/30/2018
From:	; NAC International
To:	Nishka Devaser; Spent Fuel Licensing Branch
	Devaser N
References
	Download: ML19002A314 (78)
	v • d • e

ANAC fdfl INTERNATIONAL Atlanti Corporate Headquaners: 39SO East Jones Bnd1e Road, Norc;ro$$, Georgia 30092 USA Phone 770-447-1144, Fu 770-447-1797, www.nacintl.com April 2018 Revision 18C

Enclosure I to ED20180044 Page I of2 Additional Information and Supporting Documents for NAC-STC SAR, Revision 18C April 2018 to ED20180044 Page 2 of2 List of Calculations and Supporting Documents

1. Calculation 423-2010, Revision 4 Calculation withheld in its entirety per 10 CFR 2.390.

to ED20180044 Page 1 of3 List of Changes NAC-STC SAR, Revision 18C April 2018

to ED20180044 Page 2 of3 List of Changes, NAC-STC SAR, Revision 18C Chapter I Page 1-v, updated List of Drawings.

Chapter 2 Page 2.6.12.6-1, modified text in the middle of the page, and modified the equation near the bottom of the page.

Page 2.6.12.13-1, added third paragraph at the bottom of the page.

Page 2.7.8.2-1, modified text in the middle of the page, and modified the equation at the bottom of the page.

Page 2.7.8.2-2, modified the first equation on the page.

Page 2.7.8.3-7, modified the last sentence of the fifth paragraph on the page.

Page 2.7.8.3-8, modified the text and the equation in the middle of the page.

Pages 2.7.8.3-10 thru 2.7.8.3-12, modified the text and equations throughout the pages.

Page 2.7.8.5-1, added the third paragraph at the bottom of the page.

Chapter 3 No changes.

Chapter 4 No changes.

Chapter 5 Pages 5-iii, 5-xii and 5-xix, modified table of contents, list of figures, and list of tables to reflect addition of new Sections 5.9 and 5.10.

Pages 5.9-1 thru 5.9-7, added new Section 5.9.

Pages 5.10-1 thru 5.10-3, added new Section 5.10.

Chapter 6 No changes Chapter 7 No changes.

Chapter 8 Page 8.1-12, modified the third paragraph of Section 8.1.5.1, and added new Section 8.1.5.1.1.

to ED20180044 Page 3 of3 Pages 8.1-13 thru 8.1-25, text flow changes.

Chapter 9 No changes.

to ED20180044 Page 1 of2 List of Drawing Changes NAC-STC SAR, Revision 18C April 2018

to ED20180044 Page 2 of2 List of Drawing Changes, NAC-STC SAR, Revision 18C Drawing 423-872, Revision 7

1. B.O.M., Add Item 5, Qty "A/R" for Assy 99, Name "Shield Plate", Material "304 St.

Stl.", Spec "ASTM A240" and Description "1 1/4 Plate".

2. Add a delta note 5 that reads "Item 5 (Shield Plate) is optional as defined by the NRC Certificate of Compliance."

3. Update graphics of Assy 99 to show Item 5 placed approximately as shown.

to ED20180044 Page 1 of3 Proposed Changes for Certificate of Compliance Revision 18 NAC-STC SAR, Revision 18C April 2018

to ED20180044 Page 2 of3 CoC Sections (revised)

Page 5 of22 5.(a)(3) Drawings (i)

The cask is constructed and assembled in accordance with the following Nuclear Assurance Corporation (now NAC International) Drawing Nos.:

423-800, sheets 1-3, Rev. 18P & 18NP 423-802, sheets 1-7, Rev. 22 423-803, sheets 1-2, Rev. 14 423-804, sheets 1-3, Rev. 11 423-805, sheets 1-2, Rev. 7 423-806, sheets 1-2, Rev. 12 423-807, sheets 1-3, Rev. 4 423-811, sheets 1-2, Rev. 12 423-812, Rev. 6 423-900, Rev. 8 423-209, Rev. 0 423-210, Rev. 0 423-901, sheets 1-2, Rev. 3 (ii)

For the directly loaded configuration, the basket is constructed and assembled in accordance with the following Nuclear Assurance Corporation (now NAC International)

Drawing Nos.:

423-870, Rev. 6 423-871, Rev. 5 423-872, Rev. 7 423-873, Rev. 2 423-874, Rev. 2 423-875, sheets 1-2, Rev. 11 423-878, sheets 1-2, Rev. 4 423-880, Rev. 2P & lNP Page 21 of22

14.

Transport by air is not authorized.

15.

The package authorized by this certificate is hereby approved for use under the general license provisions of 10 CFR 71.17.

16.

Expiration date:

May 31, 2019

to ED20180044 Page 3 of3 CoC Sections (new)

Page21 o/22

13.

For casks fabricated and accepted using the gamma shielding integrity acceptance criteria described in Chapter 8, Section 8.1.5.1.1 of the NAC-STC SAR for the upper 10.18 inches of the cask upper lead region, the cask user shall use the optional shield plate for the basket top weldment as detailed in license drawing 423-872 when conducting a shipment of directly loaded fuel. The cool times for the use of the alternate upper weldment basket configuration have been compared to the cool times for the design basis directly loaded low burnup and HBU fuel and are bounded.

to ED20180044 Page I of 1 NAC-STC SAR Changes Pages and LOEP NAC-STC SAR, Revision 18C April 2018

NAC-STC NAC Storage Transport Cask SAFETY ANALYSIS REPORT Volume 1 of 2 Non-Proprietary Version Docket No. 71-9235 ANAC ffifl INTERNATIONAL Atlanta Corporate Headquarters: 3950 East Jol'te's 8'i.dge Road, Norcross, Georsf.a 30092 USA Phone n0-447*1144,Fax 770-447*1797, www.nacint l.com April 2018 Revision 18C

NAC-STC SAR Docket No. 71-9235 April 2018 Revision 1 SC List of Effective Pages Chapter 1 Pages 2.6.1-1 thru 2.6.1-7............. Revision 18 Pages 2.6.2-1 thru 2.6.2-8............. Revision 18 Page 1-i thru 1-iv.......................... Revision 18 Page 2.6.3-1.................................. Revision 18 Page 1-v...................................... Revision I SC Page 2.6.4-1.................................. Revision 18 Page I-vi thru 1-ix........................ Revision 18 Pages 2.6.5-1 thru 2.6.5-2............. Revision 18 Pages 1-1 thru 1-12....................... Revision 18 Page 2.6.6-1.................................. Revision 18 Pages 1. 1-1 thru 1.1-46................. Revision 18 Page 2.6.7-1.................................. Revision 18 Pages 1.2-1 thru 1.2-49................. Revision 18 Pages 2.6.7.1-1 thru 2.6.7.1-17.... Revision 18 Page 1.3-1..................................... Revision 18 Pages2.6.7.2-l thru2.6.7.2-19..... Revision 18 Pages 1.4-1 thru 1.4-24................. Revision 18 Pages 2.6.7.3-1 thru 2.6.7.3-11..... Revision 18 Pages 2.6.7.4-1 thru 2.6.7.4-59..... Revision 18 Chapter 2 Pages 2.6.7.5-1 thru 2.6.7.5-13..... Revision 18 Pages 2.6.7.6-1 thru 2.6.7.6-13..... Revision 18 Pages 2-i thru 2-lxviii.................... Revision 18 Pages 2.6.7.7-1 thru 2.6.7.7-5....... Revision 18 Page 2-1........................................ Revision 18 Page 2.6.8-1.................................. Revision 18 Pages 2.1.1-1 thru 2.1.1-5............. Revision 18 Page 2.6.9-1.................................. Revision 18 Pages 2.1.2-1 thru 2.1.2-5............. Revision 18 Page 2.6.10-1................................ Revision 18 Pages 2.1.3-1 thru 2.1.3-15........... Revision 18 Pages 2.6.10.1-1 thru Pages 2.2-1 thru 2.2-8................... Revision 18 2.6.10.1-2................................ Revision 18 Pages 2.3.1-1 thru 2.3.1-2............. Revision 18 Pages 2.6.10.2-1 thru Pages 2.3.2-1 thru 2.3.2-5............. Revision 18 2.6.10.2-4................................ Revision 18 Pages 2.3.3-1 thru 2.3.3-2............. Revision 18 Pages 2.6. 10.3-1 thru Pages 2.3.4-1 thru 2.3.4-3............. Revision 18 2.6.10.3-7................................ Revision 18 Pages 2.3.5-1 thru 2.3.5-2............. Revision 18 Pages 2.6.11-1 thru Pages 2.3.6-1 thru 2.3.6-5............. Revision 18 2.6.11-2................................... Revision 18 Page 2.3.7-1.................................. Revision 18 Pages 2.6.11.1-1 thru Page 2.3.8-1.................................. Revision 18 2.6.11.1-4................................ Revision 18 Page 2.4-1..................................... Revision 18 Pages 2.6.11.2-1 thru Page 2.4.1-1.................................. Revision 18 2.6.11.2-1 1.............................. Revision 18 Page 2.4.2-1.................................. Revision 18 Page 2.6.11.3-1............................. Revision 18 Page 2.4.3-1.................................. Revision 18 Pages 2.6.12-1 thru Pages 2.4.4-1 thru 2.4.4-10........... Revision 18 2.6.12-5................................... Revision 18 Page 2.4.5-1.................................. Revision 18 Page 2.6.12.1-1............................. Revision 18 Page 2.4.6-1........ '.......................... Revision 18 Pages 2.6.12.2-1 thru Pages2.5.l-l thru2.5.l-38........... Revision 18 2.6.12.2-5................................ Revision 18 Pages 2.5.2-1 thru 2.5.2-29........... Revision 18 Pages 2.6.12.3-1 thru Pages 2.6-1 thru 2.6-2................... Revision 18 2.6.12.3-7................................ Revision 18 1 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision l 8C List of Effective Pages (continued)

Pages 2.6.12.4-1 thru Pages 2.6.13.11-1 thru 2.6.12.4-3................................. Revision 18 2.6.13.11-3............................... Revision 18 Pages 2.6.12.5-1 thru Pages 2.6.13.12-1 thru 2.6.12.5-3................................. Revision 18 2.6.13.12-2............................... Revision 18 Page 2.6.12.6-1........................... Revision 18C Pages 2.6.14-1 thru Page 2.6.12.6-2.............................. Revision 18 2.6.14-8.................................... Revision 18 Pages 2.6.12.7-1 thru Pages 2.6.14.1-1 thru 2.6.12. 7-22............................... Revision 18 2.6.14.1-2................................. Revision 18 Pages 2.6.12.8-1 thru Pages 2.6.14.2-1 thru 2.6.12. 8-2................................. Revision 18 2.6.14.2-16............................... Revision 18 Pages 2.6.12.9-1 thru Pages 2.6.14.3-1 thru 2.6.12.9-11............................... Revision 18 2.6.14.3-3................................. Revision 18 Page 2.6.12.10-1............................ Revision 18 Pages 2.6.14.4-1 thru Page 2.6.12. 11-1............................ Revision 18 2.6.14.4-4................................. Revision 18 Page 2.6.12.12-1............................ Revision 18 Pages 2.6.14.5-1 thru Pages 2.6.12.13-1....................... Revision 18C 2.6.14.5-3................................. Revision 18 Pages 2.6.12.13-2 thru Page 2.6.14.6-1.............................. Revision 18 2.6.12.13-4............................... Revision 18 Pages 2.6.14.7-1 thru Pages 2.6.13-1 thru 2.6.14. 7-14............................... Revision 18 2.6.13-3.................................... Revision 18 Pages 2.6.14.8-1 thru Pages 2.6.13.1-1 thru 2.6.14. 8-6................................. Revision 18 2.6.13.1-2................................. Revision 18 Page 2.6.14.9-1.............................. Revision 18 Pages 2.6.13.2-1 thru Page 2.6.14.10-1............................ Revision 18 2.6.13.2-7................................. Revision 18 Pages 2.6.14.11-1 thru Pages 2.6.13.3-1 thru 2.6.14.11-5............................... Revision 18 2.6.13.3-4................................. Revision 18 Pages 2.6.14.12-1 thru Pages 2.6.13.4-1 thru 2.6.14.12-5............................... Revision 18 2.6.13.4-5................................. Revision 18 Page 2.6.15-1................................. Revision 18 Pages 2.6.13.5-1 thru Pages 2.6.15.1-1 thru 2.6.13.5-2................................. Revision 18 2.6.15.1-2................................. Revision 18 Pages 2.6.13.6-1 thru Pages2.6.15.2-l thru 2.6.13.6-2................................. Revision 18 2.6.15.2-7................................. Revision 18 Pages 2.6.13.7-1 thru Pages 2.6.15.3-1 thru 2.6.13.7-2................................. Revision 18 2.6.15.3-4................................. Revision 18 Page 2.6.13.8-1.............................. Revision 18 Pages 2.6.15.4-1 thru Page 2.6.13. 9-1.............................. Revision 18 2.6.15.4-4................................. Revision 18 Page 2.6.13.10-1............................ Revision 18 Page 2.6.15.5-1.............................. Revision 18 2 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision l 8C List of Effective Pages (continued)

Pages 2.6.15.6-1 thru Pages 2.6.17-1 thru 2.6.15.6-3................................ Revision 18 2.6.17-13................................. Revision 18 Page 2.6.15.7-1............................. Revision 18 Pages 2.6.18-1 thru Page 2.6.15.8-1............................. Revision 18 2.6.18-6................................... Revision 18 Page2.6.15.9-1............................. Revision 18 Pages 2.6.19-1 thru Page 2.6.15.10-1........................... Revision 18 2.6.19-23................................. Revision 18 Pages 2.6.15.11-1 thru Pages 2.6.20-1 thru 2.6.15.11-3.............................. Revision 18 2.6.20-20................................. Revision 18 Pages 2.6.15.12-1 thru Pages 2.6.21-1 thru 2.6.15.12-2.............................. Revision 18 2.6.21.-2.................................. Revision 18 Pages 2.6.16-1 thru Pages 2.7-1 thru 2.7-2................... Revision 18 2.6.16-6................................... Revision 18 Page2.7.l-1 thru2.7.l-2............... Revision 18 Pages 2.6.16.1-1 thru Pages 2.7.1.1-1 thru 2.6.16.1-2................................ Revision 18 2.7.1.1-15................................ Revision 18 Pages 2.6.16.2-1 thru Pages 2.7.1.2-1 thru 2.6.16.2-11.............................. Revision 18 2.7.1.2-15................................ Revision 18 Pages 2.6.16.3-1 thru Pages 2.7.1.3-1 thru 2.6.16.3-3................................ Revision 18 2.7.1.3-9.................................. Revision 18 Pages 2.6.16.4-1 thru Pages 2. 7.1.4-1 thru 2.6.16.4-3................................ Revision 18 2.7.1.4-11................................ Revision 18 Pages 2.6.16.5-1 thru Pages 2.7.1.5-1 thru 2.6.15.5-3................................ Revision 18

2. 7.1.5-3.................................. Revision 18 Pages 2.6.16.6-1 thru Pages 2.7.1.6-1 thru 2.6.16.6-3................................ Revision 18 2.7.l.6-16................................ Revision 18 Pages 2.6.16. 7-1 thru Page 2.7.2-1.................................. Revision 18 2.6.16.7-12.............................. Revision 18 Pages 2.7.2.1-1 thru Pages 2.6.16.8-1 thru 2.7.2.1-5.................................. Revision 18 2.6.16.8-7................................ Revision 18 Pages 2.7.2.2-1 thru Page 2.6. 16.9-1............................. Revision 18 2.7.2.2-9.................................. Revision 18 Page 2.6.16.10-1........................... Revision 18 Pages 2.7.2.3-1 thru Pages2.6.16.11-1 thru 2.7.2.3-6.................................. Revision 18 2.6.16.11-4.............................. Revision 18 Pages 2.7.2.4-1 thru Pages 2.6.16.12-1 thru 2.7.2.4-7.................................. Revision 18 2.6.16.12-2.............................. Revision 18 Page 2.7.2.5-1............................... Revision 18 Pages 2.6.16.13-1 thru Page 2.7.2.6-1............................... Revision 18 2.6.16.13-2.............................. Revision 18 Page2.7.3.l-l............................... Revision 18 Page 2.6.16. I 4-1........................... Revision 18 Pages 2. 7.3.2-1 thru 2. 7.3.2-5....... Revision 18 3 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision 1 SC List of Effective Pages (continued)

Pages 2.7.3.3-1 thru 2.7.3.3-3........ Revision 18 Pages 2.7.3.4-1 thru 2.7.3.4-2........ Revision 18 Page 2.7.3.5-1................................ Revision 18 Page 2.7.3.6-1................................ Revision 18 Page 2.7.4-1................................... Revision 18 Page 2.7.5-1................................... Revision 18 Page 2.7.6-1................................... Revision 18 Pages 2.7.7-1 thru 2.7.7-4.............. Revision 18 Pages 2.7.8-1 thru 2.7.8-4.............. Revision 18 Pages 2.7.8.1-1 thru 2.7.8.1-43...... Revision 18 Pages 2.7.8.2-1 thru 2.7.8.2-2..... Revision 18C Pages 2.7.8.3-1 thru 2.7.8.3-6........ Revision 18 Pages 2.7.8.3-7 thru 2.7.8.3-8..... Revision 18C Page 2.8-1...................................... Revision 18 Pages 2.9-1 thru 2.9-11.................. Revision 18 Pages 2.10. 1-1 thru 2.10.1-4.......... Revision 18 Pages 2.10.2-1 thru 2.10.2-93........ Revision 18 Pages 2.10.3-1 thru 2.10.3-7.......... Revision 18 Pages 2.10.4-1 thru 2.10.4-288................................ Revision 18 Pages 2.10.5-1 thru 2.10.5-22........ Revision 18 Pages 2.10.6-1 thru 2.10.6.-36....... Revision 18 13 drawings in Sections 2.10.6.6 and 2.10.6.7 Page 2.7.8.3-9................................ Revision 18 Pages 2.10.6-37 thru Pages 2.7.8.3-10 thru 2.7.8.3-12. Revision I 8C 2.10.6-88.................................. Revision 18 Page 2.7.8.3-13.............................. Revision 18 Pages 2.10.7-1 thru 2. 10.7-26........ Revision 18 Pages 2.7.8.4-1 thru 2.7.8.4-10...... Revision 18 Pages 2.10.8-1 thru 2.10.8-24........ Revision 18 Page 2.7.8.5-1............................. Revision 18C Pages 2.10.9-1 thru 2.10.9-11........ Revision 18 Pages 2.7.9-1 thru 2.7.9-40............ Revision 18 Pages 2.10.10-1 thru Pages 2. 7.10-1 thru 2.7.10-12........ Revision 18 2.10.10-11................................ Revision 18 Pages 2.7.11-1 thru 2.7.11-16........ Revision 18 Pages 2.10.11-1 thru Pages 2.7.12-1 thru 2.7.12-10........ Revision 18 2.10.11-8.................................. Revision 18 Pages 2.7.13-1 thru 2.7.13-4.......... Revision 18 Pages 2.10.12-1 thru Pages2.7.13.l-l thru 2.10.12-31................................ Revision 18 2.7.13.1-18............................... Revision 18 Pages 2.7.13.2-1 thru 4 drawings in Section 2.10.12 2.7.13.2-2................................. Revision 18 Pages 2. 7.13.3-1 thru Pages 2.11.1-1 thru 2.11.1-2.......... Revision 18 2.7.13.3-4................................. Revision 18 Pages 2.11.2-1 thru 2.11.2-2.......... Revision 18 Pages 2. 7.13.4-1 thru Page 2.11.3-1................................. Revision 18 2.7.13.4-8................................. Revision 18 Page 2.11.4-1................................. Revision 18 Pages 2.7.13.5-1 thru Page 2.11.5-1................................. Revision 18 2.7.13.5-2................................. Revision 18 Pages 2.11.6-1 thru 2. 11.6-6.......... Revision 18 Pages 2. 7.14-1 thru Page 2.11.6. l 2-1 thru 2.7.14-13.................................. Revision 18 2.ll.6.12-62............................. Revision 18 Pages 2. 7. 15-1 thru Pages 2.11.6.13-l thru 2.7.15-16.................................. Revision 18 2.11.6.13-35............................. Revision 18 4 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision 18C List of Effective Pages (continued)

Pages 2.11.6.14-1 thru Pages 3.6.4-1 thru 3.6.4-24........... Revision 18 2.11.6.14-10............................ Revision 18 Pages 3.6.5-1 thru 3.6.5-3............. Revision 18 Page 2.11.6.15-1........................... Revision 18 Page3.7-1..................................... Revision 18 Pages 2.11.7-1 thru 2.11.7-8......... Revision 18 Pages 3.7.1-1 thru 3.7.1-3............. Revision 18 Pages 2. l l. 7.8-1 thru Pages 3.7.2-1 thru 3.7.2-2............. Revision 18 2.11.7.8-34.............................. Revision 18 Pages 3.7.3-1 thru 3.7.3-2............. Revision 18 Pages 2.11.7.9-1 thru Pages 3.7.4-1 thru 3.7.4-9............. Revision 18 2.11.7.9-14.............................. Revision 18 Page 3.7.5-1 thru 3.7.5-2............... Revision 18 Pages 2.11.7.10-1 thru Page 3.8-1..................................... Revision 18 2.11.7.10-5.............................. Revision 18 Pages 3.8.1-1 thru 3.8.1-4............. Revision 18 Page 2.11.8-1................................ Revision 18 Pages 3.8.2-1 thru 3.8.2-3............. Revision 18 Pages 2.11.9-1 thru 2.11.9-10....... Revision 18 Pages 3.8.3-1 thru 3.8.3-3............. Revision 18 Page 2.12.1-1................................ Revision 18 Pages 3.8.4-1 thru 3.8.4-17........... Revision 18 Pages 2.12.2-1 thru 2.12.2-2......... Revision 18 Pages 3.8.5-1 thru 3.8.5-2............. Revision 18 Page 2.12.3-1................................ Revision 18 Page 3.8.6-1.................................. Revision 18 Page 2.12.4-1................................ Revision 18 Page 2.12.5-1................................ Revision 18 Chapter 4 Page 2.12.6-1 thru 2.12.6-29......... Revision 18 Page 2.13.1-1................................ Revision 18 Page 4-i thru 4-iii.......................... Revision 18 Pages2.13.2-l thru2.13.2-2......... Revision 18 Pages 4.1-1 thru 4.1-10................. Revision 18 Page 2.13.3-1................................ Revision 18 Pages 4.2-1 thru 4.2-18................. Revision 18 Page 2. l 3.4-1................................ Revision 18 Pages 4.3-1 thru 4.3-4................... Revision 18 Page2.13.5-l................................ Revision 18 Page 4.4-1..................................... Revision 18 Pages 2. l 3.6-1 thru 2. l 3.6-62....... Revision 18 Pages 4.5-1 thru 4.5-35................. Revision 18 Pages 4.6-1 thru 4.6-2................... Revision 18 Chapter 3 Pages 4.7-1 thru 4.7-3................... Revision 18 Pages 3-i thru 3-viii....................... Revision 18 Chapter 5 Pages 3.1-1 thru 3.1-12................. Revision 18 Pages 3.2-1 thru 3.2-14................. Revision 18 Page 5-i thru 5-ii........................... Revision 18 Pages 3.3-1 thru 3.3-6................... Revision 18 Page 5-iii..................................... Revision l 8C Pages 3.4-1 thru 3.4-89................. Revision 18 Page 5-iv thru 5-xi........................ Revision 18 Pages 3.5-1 thru 3.5-16................. Revision 18 Page 5-xii.................................... Revision I 8C Page 3.6-1..................................... Revision 18 Page 5-xiii thru 5-xviii.................. Revision 18 Pages 3.6. 1-1 thru 3.6.1-4............. Revision 18 Page 5-xix................................... Revision l 8C Pages 3.6.2-1 thru 3.6.2-3............. Revision 18 Page 5-i thru 5-xix........................ Revision 18 Pages 3.6.3-1 thru 3.6.3-3............. Revision 18 Pages 5-1 thru 5-4......................... Revision I 8 5 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision l 8C List of Effective Pages (continued)

Pages 5.1-1 thru 5.1-30.................. Revision 18 Pages 6.3-1 thru 6.3-10.................. Revision 18 Pages 5.2-1 thru 5.2-40.................. Revision 18 Pages 6.4-1 thru 6.4-2.................... Revision 18 Pages 5.3-1 thru 5.3-33.................. Revision 18 Page 6.4.1-1................................... Revision 18 Pages 5.4-1 thru 5.4-41.................. Revision 18 Pages 6.4.2-1 thru 6.4.2-11............ Revision 18 Pages 5.5-1 thru 5.5-61.................. Revision 18 Pages 6.4.3-1 thru 6.4.3-29............ Revision 18 Page 5.6-1...................................... Revision 18 Pages 6.4.4-1 thru 6.4.4-30............ Revision 18 Pages 5.6.1-1 thru 5.6.1-9.............. Revision 18 Pages 6.5-1 thru 6.5-2.................... Revision 18 Pages 5.6.2-1 thru 5.6.2-20............ Revision 18 Pages 6.5.1-1 thru 6.5.1-21............ Revision 18 Pages 5.6.3-1 thru 5.6.3-13............ Revision 18 Pages 6.5.2-1 thru 6.5.2-20............ Revision 18 Pages 5.6.4-1 thru 5.6.4-34............ Revision 18 Pages 6.6-1 thru 6.6-2.................... Revision 18 Page 5.6.5-1................................... Revision 18 Pages 6.7-1 thru 6.7-333................ Revision 18 Pages 5.6.6-1 thru 5.6.6-57............ Revision 18 Page 6.8-1...................................... Revision 18 Page 5.7-1...................................... Revision 18 Pages 6.8.1-1 thru 6.8.1-6.............. Revision 18 Pages 5.7.1-1 thru 5.7.1-5.............. Revision 18 Pages 6.8.2-1 thru 6.8.2-2.............. Revision 18 Pages 5.7.2-1 thru 5.7.2-5.............. Revision 18 Pages 6.8.3-1 thru 6.8.3-20............ Revision 18 Pages 5.7.3-1 thru 5.7.3-10............ Revision 18 Pages 6.8.4-1 thru 6.8.4-34............ Revision 18 Pages 5.7.4-1 thru 5.7.4-14............ Revision 18 Pages 6.8.5-1 thru 6.8.5-34............ Revision 18 Page 5.7.5-1................................... Revision 18 Page 6.8.6-1................................... Revision 18 Pages 5.7.6-1 thru 5.7.6-22............ Revision 18 Pages 6.8.7-1 thru 6.8.7-27............ Revision 18 Page 5.8-1...................................... Revision 18 Page 6.9-1...................................... Revision 18 Pages 5.8.1-1 thru 5.8.1-9.............. Revision 18 Page 6.9.1-1................................... Revision 18 Pages 5.8.2-1 thru 5.8.2-7.............. Revision 18 Page 6.9.2-1................................... Revision 18 Pages 5.8.3-1 thru 5.8.3-6.............. Revision 18 Pages 5.8.4-1 thru 5.8.4-3.............. Revision 18 Chapter 7 Pages 5.8.5-1 thru 5.8.5-4.............. Revision 18 Pages 5.8.6-1 thru 5.8.6-5.............. Revision 18 Pages 7-i thru 7-ii.......................... Revision 18 Pages 5.8.7-1 thru 5.8.7-5.............. Revision 18 Page 7-1 thru 7-3........................... Revision 18 Pages 5.8.8-1 thru 5.8.8-5.............. Revision 18 Pages 7.1-1 thru 7.1-18.................. Revision 18 Pages 5.8.9-1 thru 5.8.9-26............ Revision 18 Pages 7.2-1 thru 7.2-5.................... Revision 18 Pages 5.9-1 thru 5.9-6................. Revision l 8C Pages 7.3-1 thru 7.3-10.................. Revision 18 Pages 5.10-1 thru 5.10-3............. Revision l 8C Pages 7.4-1 thru 7.4-11.................. Revision 18 Page 7.5-1...................................... Revision 18 Chapter 6 Pages 7.6-1 thru 7.6-6.................... Revision 18 Pages 6-i thru 6-ix......................... Revision 18 Pages 6.1-1 thru 6.1-6.................... Revision 18 Pages 6.2-1 thru 6.2-11.................. Revision 18 6 of7

NAC-STC SAR Docket No. 71-9235 Chapter 8 List of Effective Pages (continued)

Page 8-i thru 8-ii........................... Revision 18 Page 8-1........................................ Revision 18 Pages 8.1-1 thru 8.1-11................. Revision 18 Pages 8.1-12 thru 8.1-25............. Revision l 8C Pages 8.1-1 thru 8.1-38................. Revision 18 Pages 8.2-1 thru 8.2-8................... Revision 18 Page 8.3-1..................................... Revision 18 Pages 8.4-1 thru 8.4-9................... Revision 18 Chapter 9 Page 9-i......................................... Revision 18 Pages 9-1 thru 9-13....................... Revision 18 7 of7 April 2018 Revision 18C

THIS PAGE INTENTIONALLY LEFT BLANK

NAC-STC SAR Docket No. 71-9235 Drawing Number 423-800, sheets 1-3 423-800, sheets 1-3 423-802, sheets 1-7 423-803, sheets 1-2 423-804, sheets 1-3 423-805, sheets 1-2 423-806, sheets 1-2 423-807, sheets 1-3 423-209 423-210 423-257 423-258 423-811, sheets 1-2 423-812 423-843 423-859 423-870 423-871 423-872 423-873 423-874 423-875, sheets 1-2 423-878, sheets 1-2 423-880 423-880 423-900 423-901, sheets 1-2 455-800, sheets 1-2 Revision No.

Rev I 8P< 1)

Rev 18NP(J)

Rev 22 Rev 14 Rev 11 Rev 7 Rev 12 Rev 4 Rev 0 Rev 0 Rev 2 Rev 2 Rev 12 Rev 6 Rev 6 Rev 0 Rev 6 Rev 5 Rev 7 Rev 2 Rev 2 Rev 11 Rev 4 Rev 2p(l)

Rev JNp(I)

Rev 8 Rev 3 Rev 2 List of Drawings Title Cask Assembly - NAC-STC Cask Cask Assembly - NAC-STC Cask Cask Body - NAC-STC Cask Lid Assembly - Inner, NAC-STC Cask Details - Inner Lid, NAC-STC Cask Lid Assembly - Outer, NAC-STC Cask April 2018 Revision I 8C Port Coverplate Assy - Inner Lid, NAC-STC Cask Assembly, Port Cover, NAC-STC Cask Impact Limiter Assy - Upper, NAC-STC Cask Impact Limiter Assy - Lower, NAC-STC Cask Balsa Impact Limiter, Upper, NAC-STC Cask Balsa Impact Limiter, Lower, NAC-STC Cask Details - NAC-STC Cask Nameplates - NAC-STC Cask Transport Assembly, Balsa Impact Limiters, NAC-STC Attachment Hardware, Balsa Limiters, NAC-STC Fuel Basket Assembly, PWR, 26 Element, NAC-STC Cask Bottom Weldment, Fuel Basket, PWR, 26 Element, NAC-STC Cask Top Weldment, Fuel Basket, PWR, 26 Element, NAC-STC Cask Support Disk and Misc. Basket Details, PWR, 26 Element, NAC-STC Cask Heat Transfer Disk, Fuel Basket, PWR, 26 Element, NAC-STC Cask Tube, NAC-STC Cask Alternate Tube Assembly, NAC-STC Cask Shielded Thermal Shunt Assembly, NAC-STC Cask Shielded Thermal Shunt Assembly, NAC-STC Cask Package Assembly Transportation, NAC-STC Cask Transportation Package Concept, NAC-STC Cask Assembly, Transport Cask, MPC-Yankee (I) Proprietary and Non-proprietary drawing versions are only included in their respective SAR versions.

1-v

NAC-STC SAR Docket No. 71-9235 Drawing Number 455-801, sheets 1-2 455-820, sheets 1-2 455-870 455-871, sheets 1-2 455-871, sheets 1-3 455-872, sheets 1-2 455-872, sheets 1-2 455-873 455-881, sheets 1-3 455-887, sheets 1-3 455-888, sheets 1-2 455-891, sheets 1-2 455-891, sheets 1-3 455-892, sheets 1-2 455-892, sheets 1-3 455-893 455-894 455-895, sheets 1-2 455-895, sheets 1-2 455-919 414-801, sheets 1-2 414-820 414-870 414-871, sheets 1-2 414-872, sheets 1-3 414-873 414-874 414-875 414-881, sheets 1-2 414-882, sheets 1-2 March 2017 Revision 18 List of Drawings ( continued)

Revision No.

Title Rev 4 Assembly, Transport Cask, NAC-MPC Rev 3 Spacers, Transpo11 Cask, MPC-Yankee Rev 5 Canister Shell, MPC-Yankee Rev 8 Details, Canister, MPC-Yankee Rev 7P2 Details, Canister, MPC-Yankee Rev 12 Assembly, Transportable Storage Canister (TSC),

MPC-Yankee Rev l lPl Assembly, Transportable Storage Canister (TSC),

MPC-Yankee Rev 4 Assembly, Drain Tube, Canister, MPC-Yankee Rev 8 PWR Fuel Tube, MPC-Y ankee Rev 4 Basket Assembly, 24 GTCC Container, MPC-Yankee Rev 8 Assembly, Transportable Storage Canister (TSC), 24 GTCC Container, MPC-Yankee Rev I Bottom Weldment, Fuel Basket, MPC-Yankee Rev 2PO Bottom Weldment, Fuel Basket, MPC-Yankee Rev 3 Top Weldment, Fuel Basket, MPC-Yankee Rev 3PO Top Weldment, Fuel Basket, MPC-Yankee Rev 3 Support Disk and Misc. Basket Details, MPC-Yankee Rev 2 Heat Transfer Disk, Fuel Basket, MPC-Yankee Rev 5 Fuel Basket Assembly, MPC-Yankee Rev 5PO Fuel Basket Assembly, MPC-Yankee Rev 2 Retainer, United Nuclear Test Assy, MPC-Yankee Rev 2 Cask Assembly, NAC-STC, CY-MPC Rev 0 Canister Spacer CY-MPC Rev 3 Canister Shell, CY-MPC Rev 6 Details, Canister CY-MPC Rev 6 Assembly, Transportable Storage Canister (TSC),

CY-MPC Rev 2 Drain Tube Assembly, CY-MPC Rev 0 Shim, Canister, CY-MPC Rev 0 Spacer Shim, Canister, CY-MPC Rev 4 Fuel Tube, Transpo11able Storage Canister (TSC),

CY-MPC Rev 4 Oversize Fuel Tube, Transportable Storage Canister (TSC),

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NAC-STC SAR Docket

o. 71-9235 April 20 18 Revision I SC 2.6.1 2.6 Stress Evaluation of Threaded Rods and Spacer Nuts for a 1-Foot End Drop Load Cond ition (Directly Loaded Fuel Configuration)

The deceleration for the NAC-STC for the normal conditions of transport 1-foot end drop is 19.6

g. During the I-foot end drop, the threaded rods and spacer nuts in the directly loaded fuel configuration fuel basket are loaded with the weight of the 31 support disks, 20 aluminum heat transfer disks, one end plate and the weights of the threaded rods and spacer nuts.

A conservative basket weight of 17,000 pounds is used. The loads are calculated as fo llows:

Total weight of basket

=

17,000 lbs Less weight of bottom weldment

=

-67 J lbs Less weight of fuel tubes

=

-3,666 lbs 1-g load on the tie rods and spacer nuts

=

12,663 lbs A conservative load ( I g) of 13,500 lbs i used for the evaluation of the tie rods and spacer nut.

This load bounds the weight of the top weldment configuration with optional shield plates at the periphery of the top weldment assembly (shielding augmented top weldment). For the I-foot end drop ( 19.6g), the load on the tie rod and spacer nuts is 264,600 lbs (=13,500x 19.6).

The effective area of one threaded rod and spacer nut at each of the six locations supporting the weight of the support disks is equivalent to the gross area of the square spacer nut and is calculated as:

A= (2.5)(2.5)

= 6.25 in2 The average compressive stress in the threaded rods and spacer nuts is:

Sc= 264.6/(6x6.25) = 7.06 ksi The allowable stress of the 17-4 PH stainless tee I under normal conditions of tran port is Sm.

2.6. 12.6-1

L NAC-STC SAR Docket No. 71-9235 Then, the margin of safety is:

(S 111 )

MS = --- 1 = +Large Sc where:

Sm = 43.8 ksi ( 17-4 PH stainless steel at 405°F)

March 20 17 Revision 18 Therefore, the threaded rods and spacer nuts in the directly loaded fuel configuration of the fuel basket are structura lly adequate for a 19.6-g end impact under normal conditions of transport.

2.6.1 2.6-2

NAC-STC SAR Docket No. 7 J-9235 April 2018 Revision I 8C 2.6.12.1 3 Fue l Basket (Directly Loaded Fuel Configuration) Weldment Analysis for 1-Foot End Drop The responses of the top and the bottom we ldment plates of the fuel basket assembly to a 19.6g normal operation deceleration load are examined. The top and the bottom weldment plates are both I-inch thick and fabricated from SA 240, Type 304 stainless steel.

The top weldment supports its own we ight and 26 fuel tubes (without the fuel assemb lies) during a ]-foot top end drop. Simi larly the bottom weldment upports its own weight and 26 fuel tubes (without the fuel assemblies) during a I-foot bottom end drop. The responses of the end plates to the 1-foot end drop are analyzed using ANSYS ST1F63 three-dimensional, six degrees-of-freedom, elastic quadrilateral shell elements.

The finite element model for both plates is shown in Figure 2.6.1 2. 13-1. Figure 2.6. 12. 13-2 and 2.6. 12. 13-3 display the boundary conditions for the top weldment plate and the bottom we ldment plate respectively. The evaluation is based on material properties of SA 240, Type 304 at a conservative temperature of 500°F. The hottest steel support disk during normal transport conditions is 498°F, see Table 3.4-1.

The primary membrane plus primary bending stress in the top weldment plate for the 1-foot top end drop is 21.5 ksi.

T he primary membrane plus primary bending stress in the bottom weldment plate for the I-foot bottom end drop is 17.9 ksi. At 500°F, the normal condition stress allowable, 1.5 Srn, is 26.25 ksi. T he minimum margin of safety for the top we ldment plate and the bottom weldment plate are +0.22 and +0.47 respectively. Therefore, the structura l adequacy of the NAC-STC fuel basket weld ment end plates (directly loaded fuel configuration) for the normal condition of transport is demo nstrated.

Note that optional shield plates may be added to the periphery of the top we ldment to prov ide augmented shielding at top region of the fuel basket. The shie ld plates are 1.25 inches thick w ith a same height (width) as the existing support plates and the ring in basket axial direction. T he shield plates are fab ri cated from the same material as the top weldment p lates (SA 240, Type 304 stai nless steel).

Since the shield plates provide additiona l stiffness to the top weldment assembly, the 1-foot end drop ana lysis for top we ldment presented above is bounding and no further analysis is required.

2.6. 12. 13-1

NAC-STC SAR Docket No. 7 l -9235 Figure 2.6. l 2. l 3-l March 2017 Revision l 8 Fuel Basket Weldment Model (Directly Loaded Fuel Configuration) 2.6. 12.13-2

AC-STC SAR Docket No. 71-9235 April 2018 Revision I 8C 2.7.8.2 Stress Evaluation of the Directly Loaded Fuel Basket Threaded Rods and Spacer Nuts - Accident Cond ition In accordance w ith IO CFR 71.73(c)( 1 ), a spent-fuel shipping cask is subject to a free drop from a height of 30 feet onto a flat, unyielding surface. The design deceleration for the NAC-STC for the hypothetical acc ident 30-foot end drop i 56.1 g (Table 2.6.7.4.1-2).

For a bottom end drop, the threaded rods and spacer nuts are loaded with the weight of the 3 I support disks, the top plate, the 20 aluminum heat transfer disks, and the weights of the threaded rods and spacer nuts. These loads are calculated a fo llows:

Total weight of basket Less weight of bottom plate Less weight of fuel tubes 1 g load on the tie rods and spacer nut 17,000 lb

=

-671 lb

=

-3,666 lb

=

12,663 lb A conservative load ( I g) of 13,500 lb is used for the eval uation of the tie rods and spacer nuts.

This load bounds the weight of the top we ldment configuration with optional shield plates at the periphery of the top weldment assemb ly (sh ielding augmented top we ldment). For the 30-foot end drop (56. 1 g), the load on the tie rod and spacer nuts is 757,350 lbs (= 13,500x56. I).

The effective area of one threaded rod and spacer nut at each of the six locations supporting the weight of the support disks is eq ui va lent to the gross area of the square spacer nut and is calculated as:

A= (2.5)(2.5)

= 6.25 in2 The average compressive stress in the threaded rods and spacer nuts is:

Sc = 757.4/(6 x6.25) = 20.2 ksi 2.7.8.2-1

AC-STC SAR Docket No. 71-9235 Then, the margin of safety is:

M.S.

= 0.7 s"- 1 =+3.6 Sc where Su = 13 I.43 ksi

( 17-4 PH stainless steel at 405°F)

April 2018 Revision I 8C Therefore, the threaded rods and spacer nuts are structura lly adequate for a 56.1 g end impact.

2.7.8.2-2

NAC-STC SAR Docket No. 7 1-9235 2.7.8.3.2 Assessment of Buckling of the 17-4 PH T hreaded Rods 2.7.8.3.2. 1 Maximum Compressive Load April 20 18 Rev ision 18C The maximum compressive load applied to the threaded rods are during the 30 foot (9 meter) end drop, which corresponds to a max imum deceleration of 56. 1 g's.

During the end impact, the weight of the support disks, aluminum heat transfer disks, are transferred to the threaded rods. The forces due to the weight of the fuel assemblies is transmitted directly to the end plate of the cask cavity.

The threaded rods transferring the load can be represented as a direct stress (i.e., uniaxial stress).

This characterization categorizes the rod as a linear support (Section NF-3300).

To address the accident condition, Section NF-3340 can be applied w hich uses limit analyses to establish allowable loads acti ng on the support disks. Since out of plane loading is not present, the governing conditions are detailed in equation (5) of Secti on NF-3342.2, which specifies the allowable compressive fo rce (Per).

Per= 1.7 A Fa The maximum force (Pmax ::; Per ) transmitted to a threaded rod is based on the weight of the basket less the we ight of the fuel tubes and the bottom weldment (The bottom weldment weighs 671 pounds whi le the fue l tubes weight 3,666 pounds). A bounding weight of 13,500 pounds is conservatively used as the tota l weight transmi tted by the six rods.

The design of the basket is not sufficiently symmetrical to distribute the loading to the threaded rods in an eq ual fashion. To determine the di stributi on of the loads to the threaded rods in an end drop orientati on, a finite element model of a ingle support disk was generated. The model of the enti re disk shown in Figure 2.7.8.3-1 uses the ANSYS plate element (STIF63). T he material properties for 17-4 PH employed in the model correspond to the maximum basket temperature at 500°F. While the temperature does vary throughout the basket, the effect on the variation

2. 7.8.3-7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision 18C of the modulus of elasticity and the corresponding effect on the load distribution to the rods is considered to be insignificant.

The support of the threaded rod is simulated by restraining the out of plane degree of freedom at the centerline of the location of the threaded rod connection with the support disk. A Jg load was applied to the elements comprising the support disk. The nodal reactions were used to determine the load distribution to the threaded rods. The fou r threaded rods at location A in Figure 2.7.8.3-]

have the same reaction value and carry 74.5% of the we ight of the support disk, J 8.6% per rod.

The remaining two threaded rods, which are also of equal value carry 25.5% of the weight of the disk, 12.8% per rod. The limiting load fo r the threaded rod is 18.6% of the weight of the support disk.

The maxim um load to be considered for the threaded rod is 13,500 pounds amplified by 56.1 g and factored by 0.186, or Pmax = 140.9 kips.

The axial compressive stress permitted in the threaded rod, Fa, is computed in the same manner as in Section 2.7.8.3.1. In the section of the threaded rod experiencing the maximum compressive load, the span is considered as a simple span configuration and the length corresponds to the centerline to centerline distance between the support disks. The simple span condition requires the effective length factor, K, to equal 1.0 (A ISC Steel Construction Code, Eight Edition). Using the minor diameter to compute the rad ius of gyration, Kl/r = 13.279 < Cc. Using Cc = 75.70, Fa is determined to be 52.87 ksi and Per is 154.58 kips.

The margin of safety for equation (5) ofNF-3342.2 is:

M.S. = 154.58/140.9 - I = + 0. 10 2.7.8.3.2.2 Maximum Combined Ax ial and Bending Loads ln drop orientations other than the end drop, the aluminum heat transfer disks, which are supported by the threaded rods, wi ll exert a lateral component on the threaded rods. This will induce bending moment into the threaded rod.

It is assumed that the entire weight of one aluminum heat transfer disk will be carried by a single threaded rod carrying the maximum compressive load. This is conservative since the location of the closest aluminum fin to the 2.7.8.3-8

NAC-STC SAR Docket No. 71-9235 March 20 17 Revision 18 bottom of the cask will only experience the weight of 20 support disks instead of 3 I disks as in this calculation.

The combined loading is governed by equations NF-3342.2 (6) and (7).

For equation NF-3342.2 (6),

p CmM 5.,J.O

+

Per

[ I - (P/ Pe)] Mm Assuming that the mass of the heat transfer disk acts as a point load at the mid span, the maximum moment for a simple span beam is:

M

= F l / 4 where:

F

= weight of the heat transfer disk times the lateral deceleration As the cask assumes other angles, the maximum deceleration vanes. Since the maximum decelerations decrease from 56.1 g's at 0° (end drop) to 33.8 g's at 60°, it is conservative to assume the maximum deceleration i 56. 1 g*s. The lateral deceleration is 56. l sin q, where q is the angle measured from the vertical to the center! ine of the cask body. The weight of the aluminum heat transfer disk is I 05 pounds.

F

= 56.1 (. I 05) sin q (k ips)

= 4.88 inches M

= 7.186 sin q (kip-in) 2.7.8.3-9

NAC-STC SAR Docket No. 71-9235 April 2018 Revision I 8C The axial load on the rod at some angle of notation, q, is determined by 140.9 cos q kips, then P in the above equation is 140.9 cos q.

Pe

= 1.92 A Fe' where Fe_ is defined by equation NF-3322.1 (e)

Fe Fe Pe Pe Mp where z

z I 21r2 E

= 23(KI/ r )2

= 773.87

= 1.92 A F/

= 2644.78

= Sy Z

= plastic modulus for the weak ax is M bending 1.333 R3

= 1.333 (.735)3 inch 3

= 47.53 kip-in The maximum critical moment that can be resisted by a plastically designed member in the absence of axial load, Mm = Mp Mm

= 47.53 ki p-in By substituting the computed quantities into equation (6) of NF-3342.2, 140.9cos8 (1)(7.186 si n 8)

~~~~+

s; 1.0 154.58 (1 - 140.9 cos 8/2644.78) 47.53 2.7.8.3-10

NAC-STC SAR Docket No. 71-9235 or 0.1512 sin 8 0.9115 cos 8 +

0533 8 ::; 1.0 1 -.

cos April 2018 Revision I 8C It is necessary to determine the angle 8 which maximizes the left side of the inequality. The maximum ratio of 0.925 occurs at 8 = 9.9°.

The margin of safety for equation NF-3342.2 (6) is:

M.S.

= 1.0/0.925 - I = +0.08 Equation (7) ofNF-3342.2 is specified as:

p

+

M 5JO where:

substituting or Py

= the axial plastic load = yield strength times cross sectional area Py

= ( l.78)(89.8)kips Py

= 159.84 kips 140.9 cos 8 (1)(7.186 sin 8) 159.84 + 1.18(47.53) 0.88 15 cos 8 + 0.1281 sin 8.s;; 1.0 2.7.8.3-1 1

NAC-STC SAR Docket No. 71-9235 April 2018 Revision J 8C By taking the derivative and setting it to zero the maximum angle is determined to be 8 = 8.3°.

Substituting for 8 = 8.3, Equation (7) ofNF-3342.2 becomes:

0.891 ~ 1.0 The margin of safety for equation NF-3342.2 (7) is:

M.S.

= 1.0/0.891 - I = +0. 12 Also note that for M = 1.156 kip-in and Mp = 47.53 kip-in, M < Mp fo r wh ich the margin of safety is:

M.S.

= 47.53/ 1.1 56 - I = +40. 12 2.7.8.3.3 Summaries of Margins for NF-3400 Evaluation of Buckling For the 17-4 PH stainless steel support disk and threaded rod, the margins of safety are summarized below:

Equation Support Disk Threaded Rod NF-3342.2 (5)

+2.30

+0.10 NF-3342.2 (6)

+2.11

+0.08 NF-3342.2 (7)

+3. 13

+0.12 Based on Subsection NF-3340 of the ASME Bo iler and Pressure Vessel Code, Section Ill, the NAC 17-4 PH stainless steel basket design will mai ntain stability against buckl ing fo r the hypothetical 30 foot (9 meter) drop onto an unyielding surface.

2.7.8.3-1 2

NAC-STC SAR Docket No. 71 -9235 April 2018 Revision I 8C 2.7.8.5 Directly Loaded Fuel Basket Weldment Analysis for 30-Foot End Drop The response of the top and the bottom weldment plates of the fuel basket assembly to a 56. 1 g accident condition deceleration load are examined. The top and bottom weldment plates are both I-inch thick and fa bricated from SA 240, Type 304 stainless steel. The top weldment supports its own weight as well as the weight of the 26 fuel tubes (without the fuel assemblies) during a 30-foot top end drop. Similarly the bottom weldment supports its own weight and also the weight of the 26 fuel tubes (without the fuel assemblies) during a 30-foot bottom end drop. The responses of the end plates to the 30-foot end drop are analyzed using ANSYS STJF63 three-dimensional, six degrees of freedom, elastic quadrilateral shell elements. The fi nite element model for both weldment plates and the corresponding boundary condition of each weldment plate are shown in Section 2.6. 12. 13, Figure 2.6. 12. 13-1 through Figure 2.6.1 2.13-3.

The evaluation is based on material properties of SA 240, Type 304 at a conservative temperature of 500°F. The hottest steel support disk during normal transport conditions is 498°F, see Table 3.4-1.

The primary membrane plus primary bending stress in the top weldment plate for the 30-foot top end drop is 61.9 ksi.

The primary membrane plus primary bending stress in the bottom weldment plate fo r the 30-foot bottom end drop is 5 1.3 ksi. At 500°F, the accident condition stress allowable, Su is 63.5 ksi. The minimum margin of safety for the top weldment plate and the bottom weldment plate are +0.03 and +0.24 respecti vely. Therefore, the structural adequacy of the NAC-STC fuel basket weldment end plates for the accident condition of transport is demonstrated.

Note that optional shield plates may be added to the periphery of the top weldment to provide augmented shielding at the top region of the fuel basket. The shield plates are 1.25 inches thick with a same height (width) as the existing support plates and the ri ng in the basket axial di rection. The shield plates are fabricated from the same materia l as the top weldment plates (SA 240, Type 304 stainless steel). Since the shield plates prov ide additional stiffness to the top weldment assembly, the 30-foot end drop analysis fo r top weldment presented above is bounding and no further analysis is required.

2.7.8.5-1

THIS PAGE INTENTIONALLY LEFT BLANK

April 2018 Revision 18C ANAC ii INT E RN AT ION AL Atlantil Corporite He*dquuters; 3950 fut Jones Bnd&e Road, Norcross, Georgia 30092 USA.

Phon* 770-447*1144, Fax 770-447*1797, www.nacintl.com

NAC-STC SAR Docket No. 7 l -9235 Apri l 2018 Revision I 8C List of Effective Pages Chapter 1 Pages 2.6.1-1 thru 2.6.1 -7............. Revision 18 Pages 2.6.2-1 thru 2.6.2-8............. Revision 18 Page 1-i thru 1-iv.......................... Revision 18 Page 2.6.3-1.................................. Revision 18 Page 1-v...................................... Revision I 8C Page 2.6.4-1.................................. Revision 18 Page I-vi thru I-ix........................ Rev ision 18 Pages 2.6.5-1 thru 2.6.5-2............. Revision 18 Pages 1-1 thru 1-1 2....................... Revision 18 Page 2.6.6-1.................................. Revision 18 Pages I.I-I thru 1.1-46................. Revision 18 Page 2.6.7-1.................................. Revision l 8 Pages 1.2-1 thru 1.2-49................. Rev ision 18 Pages2.6.7. 1-I thru 2.6.7. 1-17.... Revision 18 Page 1.3-1..................................... Revision 18 Pages 2.6.7.2-1 thru 2.6.7.2-19..... Revision 18 Pages 1.4-1 thru 1.4-24................. Revision 18 Pages 2.6.7.3-1 thru 2.6.7.3-11..... Revision 18 Pages 2.6.7.4-1 thru 2.6.7.4-59..... Revision 18 Chapter 2 Pages 2.6.7.5-1 thru 2.6.7.5-13..... Revision 18 Pages 2.6.7.6-1 thru 2.6.7.6-13..... Revision 18 Pages 2-i thru 2-lxvi ii.................... Rev ision 18 Pages 2.6.7.7-1 thru 2.6.7.7-5....... Revision 18 Page 2-1........................................ Revi ion 18 Page 2.6.8-1.................................. Revision 18 Pages 2.1. 1-1 thru 2. 1.1-5............. Rev ision 18 Page 2.6.9-1.................................. Revision 18 Pages 2.1.2-1 thru 2. 1.2-5............. Rev ision 18 Page 2.6.10-1................................ Revision 18 Pages 2.1.3-1 thru 2. 1.3-15........... Revision 18 Pages 2.6. 10. 1-1 thru Pages 2.2-J thru 2.2-8................... Rev ision 18 2.6. 10.1-2................................ Revision 18 Pages 2.3.1-1 thru 2.3. 1-2............. Rev ision 18 Pages 2.6. 10.2-1 thru Pages 2.3.2-1 thru 2.3.2-5............. Revision 18 2.6. 10.2-4................................ Revision 18 Pages 2.3.3-1 thru 2.3.3-2............. Rev ision 18 Pages 2.6. I 0.3-1 thru Pages 2.3.4-1 thru 2.3.4-3............. Revision 18 2.6. I 0.3-7................................ Revision 18 Pages 2.3.5-1 thru 2.3.5-2............. Rev ision 18 Pages 2.6.11-1 thru Pages 2.3.6-1 thru 2.3.6-5............. Revision 18 2.6. 1 1-2................................... Revision 18 Page 2.3.7-1.................................. Revision 18 Page 2.6. 1 1.1-1 thru Page 2.3.8-1.................................. Rev ision 18 2.6. 1 1.1-4................................ Revision 18 Page 2.4-1..................................... Revision 18 Pages 2.6.1 I.2-1 thru Page 2.4. 1-1.................................. Revision 18 2.6. 11.2-11.............................. Rev ision 18 Page 2.4.2-1.................................. Revision 18 Page 2.6.11.3-1............................. Rev ision 18 Page 2.4.3-1.................................. Revision 18 Page 2.6. 12-1 thru Pages 2.4.4-1 thru 2.4.4-10........... Rev ision 18 2.6. 12-5................................... Revision 18 Page 2.4.5-1.................................. Revi ion 18 Page 2.6.12. 1-1............................. Revision 18 Page 2.4.6-1.................................. Revi ion 18 Pages 2.6. 12.2-1 thru Pages 2.5. 1-1 thru 2.5. 1-38........... Revi ion 18 2.6. 12.2-5................................ Rev ision 18 Pages 2.5.2-1 thru 2.5.2-29........... Revision 18 Pages 2.6.12.3-1 thru Pages 2.6-1 thru 2.6-2................... Revision I 8 2.6. 12.3-7................................ Revision 18 I of 7

AC-STC SAR Docket No. 71-9235 April 201 8 Revision I 8C List of Effective Pages (continued)

Pages 2.6. 12.4-1 thru Pages 2.6. 13. 11 -1 thru 2.6.1 2.4-3................................. Revision 18 2.6. 13. 11-3............................... Revision 18 Pages 2.6. 12.5-1 thru Pages 2.6. 13. 12-1 thru 2.6. 12.5-3................................. Revision 18 2.6. I 3.12-2............................... Revision 18 Page 2.6.1 2.6-1........................... Revision I 8C Pages 2.6.14-1 thru Page 2.6.12.6-2.............................. Revision 18 2.6.1 4-8.................................... Revision 18 Pages 2.6. l 2.7-1 thru Pages 2.6.14.1-1 thru 2.6.12.7-22............................... Revision 18 2.6.1 4.1-2................................. Revision 18 Pages 2.6. l 2.8-1 thru Pages 2.6. 14.2-1 thru 2.6.1 2.8-2................................. Revision 18 2.6.14.2-16............................... Revision 18 Pages 2.6. 12.9-1 thru Pages 2.6.14.3-1 thru 2.6.12.9-1 I............................... Revision 18 2.6. 14.3-3................................. Revision 18 Page 2.6.12. 10-1............................ Revision I 8 Pages 2.6. 14.4-1 thru Page 2.6. I 2.1 I - I............................ Revision I 8 2.6. 14.4-4................................. Revision 18 Page 2.6. 12.12-1............................ Revision I 8 Pages 2.6. 14.5-1 thru Pages 2.6. 12.1 3-1....................... Revision I 8C 2.6. 14.5-3................................. Revision 18 Pages 2.6.12. 13-2 thru Page 2.6. 14.6-1.............................. Revision 18 2.6. 12.1 3-4............................... Revision 18 Pages 2.6.14.7-1 thru Pages 2.6.13-1 thru 2.6. 14.7-14............................... Revision 18 2.6.13-3.................................... Revision 18 Pages 2.6. 14.8-1 thru Pages 2.6.1 3.1 -1 thru 2.6. 14.8-6................................. Revision 18 2.6.1 3.1-2................................. Revision 18 Page 2.6.14.9-1.............................. Revision 18 Pages 2.6.1 3.2-1 thru Page 2.6.14. 10- 1............................ Revision 18 2.6.1 3.2-7................................. Revision 18 Pages 2.6.14. l 1-1 thru Pages 2.6. 13.3-1 thru 2.6.1 4.1 1-5............................... Revision 18 2.6.13.3-4................................. Revision 18 Pages 2.6. 14. 12-1 thru Pages 2.6. 13.4-1 thru 2.6. 14. 12-5............................... Revision 18 2.6. 13.4-5................................. Revision 18 Page 2.6. 15-1................................. Revision 18 Pages 2.6.1 3.5-1 thru Pages 2.6. 15. 1-1 thru 2.6. 13.5-2................................. Revision I 8 2.6.15.1-2................................. Revision 18 Pages 2.6. 13.6-1 thru Pages 2.6.15.2-1 thru 2.6. 13.6-2................................. Revision 18 2.6.15.2-7................................. Revision 18 Pages 2.6.13.7-1 thru Pages 2.6. 15.3-1 thru 2.6.1 3.7-2................................. Re ision 18 2.6. 15.3-4................................. Revision 18 Page 2.6.1 3.8-1.............................. Revision 18 Pages 2.6.15.4-1 thru Page 2.6.1 3.9-1.............................. Revision 18 2.6.15.4-4................................. Revision 18 Page 2.6.1 3. 10-1............................ Revision 18 Page 2.6. 15.5-1.............................. Revision 18 2 of 7

NAC-STC SAR Docket o. 71-9235 April 2018 Revision I 8C List of Effective Pages (continued)

Pages 2.6.15.6-1 thru Pages 2.6. 17-1 thru 2.6.15.6-3................................ Revision 18 2.6. 17-1 3................................. Revision 18 Page 2.6.15.7-1............................. Revision 18 Pages 2.6.18-1 thru Page 2.6.15.8-1............................. Revision 18 2.6.18-6................................... Revision 18 Page 2.6. 15.9-1............................. Revision 18 Pages 2.6.19-1 thru Page 2.6.15.10-1........................... Revision 18 2.6. 19-23................................. Revision J 8 Pages 2.6.15.1 1-1 thru Pages 2.6.20- 1 thru 2.6.15.11-3.............................. Revision 18 2.6.20-20................................. Revision 18 Pages 2.6.15. J 2-J thru Pages 2.6.2 1-1 thru 2.6.15.12-2.............................. Revision 18 2.6.2 1.-2.................................. Revision 18 Pages 2.6.16-1 thru Pages 2.7-1 thru 2.7-2................... Revision 18 2.6.16-6................................... Revision 18 Page 2.7.1-1 thru 2.7.1-2............... Revision 18 Pages 2.6. 16. l-J thru Page 2.7. 1.1-1 thru 2.6.1 6.1-2................................ Revision 18 2.7.l.1-1 5................................ Revision 18 Pages 2.6. 16.2-1 thru Pages2.7.l.2-I thru 2.6.16.2-11.............................. Revision 18 2.7.1.2-1 5................................ Revision J 8 Pages 2.6.16.3-1 thru Pages 2.7.1.3-1 thru 2.6.1 6.3-3................................ Revision 18 2.7. 1.3-9.................................. Revision 18 Pages 2.6.16.4-J thru Pages 2.7. 1.4-1 thru 2.6. 16.4-3................................ Revision 18 2.7. l.4-11................................ Revision 18 Pages 2.6. 16.5-J thru Page 2.7.1.5-1 thru 2.6. 15.5-3................................ Revision 18 2.7.1.5-3.................................. Revision J 8 Pages 2.6. 16.6-1 thru Pages 2.7.1.6-1 thru 2.6.16.6-3................................ Revision 18 2.7. 1.6-16................................ Revision 18 Pages 2.6. 16.7-1 thru Page 2.7.2-1.................................. Revision 18 2.6.16.7-1 2.............................. Revision 18 Pages 2.7.2.1-1 thru Pages 2.6. 16.8-1 thru 2.7.2. 1-5.................................. Revision 18 2.6. 16.8-7................................ Revision 18 Pages 2.7.2.2-1 thru Page 2.6. 16.9-1............................. Revision 18 2.7.2.2-9.................................. Revision 18 Page 2.6.16.10-1........................... Revision 18 Pages 2.7.2.3-1 thru Pages 2.6.16.1 1-1 thru 2.7.2.3-6.................................. Revision 18 2.6.1 6. 1 J -4.............................. Revision 18 Page 2.7.2.4-1 thru Pages 2.6. 16. 12-1 thru 2.7.2.4-7.................................. Revision 18 2.6.1 6.12-2.............................. Revision 18 Page 2.7.2.5-1............................... Revision 18 Pages 2.6. 16.13-1 thru Page 2.7.2.6-1............................... Revision 18 2.6. 16. 13-2.............................. Revision 18 Page 2.7.3.1-1............................... Revision 18 Page 2.6.16.14-1........................... Revision 18 Pages 2.7.3.2-1 thru 2.7.3.2-5....... Revision 18 3 of 7

AC-STC SAR Docket No. 71-9235 April 20 18 Revision l 8C List of Effective Pages (continued)

Pages 2.7.3.3-1 thru 2.7.3.3-3........ Revision 18 Pages 2.7.3.4-1 thru 2.7.3.4-2........ Revision 18 Page2.7.3.5-I................................ Revision 18 Page 2.7.3.6-1................................ Revision 18 Page 2.7.4-1................................... Revision 18 Page 2.7.5-1................................... Revision 18 Page 2.7.6-1................................... Revision 18 Pages 2.7.7-1 thru 2.7.7-4.............. Revision 18 Pages 2.7.8-1 thru 2.7.8-4.............. Revision 18 Pages 2.7.8. 1-1 thru 2.7.8.1-43...... Revision 18 Pages 2.7.8.2-1 thru 2.7.8.2-2..... Revision 18 Pages 2.7.8.3-1 thru 2.7.8.3-6........ Revision 18 Pages 2.7.8.3-7 thru 2.7.8.3-8..... Revision I 8C Page 2.7.8.3-9................................ Revision 18 Pages 2.7.8.3-10 thru 2.7.8.3-12. Revision 18C Page 2.7.8.3-13.............................. Revision 18 Pages 2.7.8.4-1 thru 2.7.8.4-1 O...... Revision 18 Page 2.7.8.5-1............................. Revision I 8C Pages 2.7.9-1 thru 2.7.9-40............ Revision 18 Pages 2.7.10-1 thru 2.7.1 0-12........ Revision 18 Pages 2.7.11-1 thru 2.7. 11-1 6........ Revision 18 Pages 2.7. 12-1 thru 2.7.1 2-10........ Revision I 8 Pages 2.7. 13-1 thru 2.7.13-4.......... Revision 18 Pages2.7.J3. I-I thru 2.7.13. J-1 8............................... Revision 18 Pages 2.7. 13.2-1 thru 2.7.13.2-2................................. Revision 18 Pages 2.7. 13.3-1 thru 2.7.13.3-4................................. Revision 18 Pages 2.7. 13.4-1 thru 2.7.13.4-8................................. Revision 18 Pages 2.7.1 3.5-1 thru 2.7.13.5-2................................. Revision 18 Pages 2. 7.14-1 thru 2.7.14-13.................................. Revision 18 Pages 2.7.15-1 thru 2.7.15-16.................................. Revision 18 Page 2.8-1...................................... Revision 18 Pages 2.9-1 thru 2.9-1 I.................. Revision 18 Pages 2. 10.1-1 thru 2.10.1-4.......... Revision 18 Pages 2.10.2-1 thru 2.1 0.2-93........ Revision 18 Pages 2. 10.3-1 thru 2. 10.3-7.......... Revision 18 Pages 2. 10.4-1 th ru

2. 10.4-288................................ Revision 18 Pages 2. 10.5-1 thru 2.10.5-22........ Revision 18 Pages 2. 10.6-1 thru 2. 10.6.-36....... Revision 18 13 drawings in Sections

2. 10.6.6 and 2. 10.6.7 Pages 2. 10.6-37 thru

2. 10.6-88.................................. Revision 18 Pages 2. 10.7-1 thru 2. 10.7-26........ Revision 18 Pages 2. 10.8-1 thru 2. 10.8-24........ Revision 18 Pages 2. 10.9-1 thru 2. 10.9-1 1........ Revision 18 Pages 2. 10.10-1 thru

2. 10.10- 1 I................................ Revision 18 Pages 2. 10.1 1-1 thru

2. I0.11-8.................................. Revision 18 Pages 2. 10.1 2-1 thru

2. 10. 12-3 1................................ Revision 18 4 drawings in Section 2. 10.12 Pages 2. 11.1-1 thru 2. 11.1-2.......... Revision 18 Pages 2. 11.2-1 thru 2. 11.2-2.......... Revision 18 Page 2. 11.3-1................................. Rev ision 18 Page 2. 11.4-1................................. Revision l 8 Page 2. 1 I.5-1................................. Revision 18 Pages 2.1 1.6-1 thru 2. I I.6-6.......... Revision 18 Page 2. 1 I.6.1 2-1 thru

2. I I.6. 12-62............................. Revision 18 Pages 2. 1 1.6. 13-1 thru 2.1 1.6. 13-35............................. Revision 18 4 of7

NAC-STC SAR Docket No. 71-9235 Apri l 2018 Revision 18C List of Effective Pages (continued)

Pages 2.11.6. 14-1 thru Pages 3.6.4-1 thru 3.6.4-24........... Revision 18 2.11.6. 14-10............................ Revision 18 Pages 3.6.5-1 thru 3.6.5-3............. Revision 18 Page 2. 1 l.6.15-1........................... Revision 18 Page 3.7-1..................................... Revision 18 Pages 2.11.7-1 thru 2. 11.7-8......... Revision 18 Pages 3.7.1-1 thru 3.7.1-3............. Revision 18 Pages 2.11.7.8-1 thru Pages 3.7.2-1 thru 3.7.2-2............. Revision 18 2.1 l.7.8-34.............................. Revision 18 Pages 3.7.3-1 thru 3.7.3-2............. Revision 18 Pages 2.11.7.9-1 thru Pages 3.7.4-1 thru 3.7.4-9............. Revision 18

2. 1 l.7.9-14.............................. Revision 18 Page 3.7.5-1 thru 3.7.5-2............... Revision 18 Pages 2.11.7. 10- l thru Page 3.8-1..................................... Revision 18 2.1].7.10-5.............................. Revision 18 Pages 3.8.1-1 thru 3.8. 1-4............. Revision 18 Page2.11.8-l................................ Rev ision 18 Pages 3.8.2-1 thru 3.8.2-3............. Revision 18 Pages 2.11.9-1 thru 2. 11.9-10....... Revision 18 Pages 3.8.3-1 thru 3.8.3-3............. Revision 18 Page 2.12.1-1................................ Revision 18 Pages 3.8.4-l thru 3.8.4-17........... Revision 18 Pages 2.12.2-1 thru 2. 12.2-2......... Revision 18 Pages 3.8.5-1 thru 3.8.5-2............. Revision 18 Page 2.12.3-1................................ Revision 18 Page 3.8.6-1.................................. Revision 18 Page 2.12.4-1................................ Revision 18 Page 2. 12.5-1................................ Revision 18 Chapter 4 Page 2. 12.6-1 thru 2.1 2.6-29......... Revision 18 Page 2. 13.1-1................................ Revision 18 Page 4-i thru 4-iii.......................... Revision 18 Pages 2.13.2-1 thru 2.13.2-2......... Revision 18 Pages 4.1 -1 thru 4.1-10................. Revision l 8 Page 2.1 3.3-1................................ Revision 18 Pages 4.2-1 thru 4.2-1 8................. Revision 18 Page 2.13.4-1................................ Revision 18 Pages 4.3-1 thru 4.3-4................... Revision 18 Page 2. 13.5-1................................ Revision 18 Page 4.4-1..................................... Revision ] 8 Pages 2. 13.6-1 thru 2. 13.6-62....... Revision 18 Pages 4.5-1 thru 4.5-35................. Revision 18 Pages 4.6-1 thru 4.6-2................... Revision 18 Chapter 3 Pages 4.7-1 thru 4.7-3................... Revision 18 Pages 3-i thru 3-viii....................... Revision 18 Chapter 5 Pages3.I -I thru 3. l-12................. Rev ision 18 Pages3.2-1 thru 3.2-14................. Revision 18 Page 5-i thru 5-ii........................... Revision 18 Pages 3.3-1 thru 3.3-6................... Revision 18 Page 5-i ii..................................... Revision 18C Pages 3.4-1 thru 3.4-89................. Revision 18 Page 5-iv thru 5-xi........................ Revision 18 Pages 3.5-1 thru 3.5-16................. Revision 18 Page 5-xii.................................... Revision 18C Page 3.6-1..................................... Revision 18 Page 5-xiii thru 5-xv iii.................. Rev ision 18 Pages 3.6.1-1 thru 3.6.1-4............. Revision 18 Page 5-xix................................... Revision 18C Pages 3.6.2-1 thru 3.6.2-3............. Revision 18 Page 5-i thru 5-x ix........................ Revision 18 Pages 3.6.3-1 thru 3.6.3-3............. Revision 18 Pages 5-1 thru 5-4......................... Revision 18 5 of7

NAC-STC SAR Docket No. 71-9235 April 2018 Revision 18C List of Effective Pages (continued)

Pages 5.1-1 thru 5.1-30.................. Revision 18 Pages 6.3-1 thru 6.3-1 O.................. Revision 18 Pages 5.2-1 thru 5.2-40.................. Revision 18 Pages 6.4-1 thru 6.4-2.................... Revision 18 Pages 5.3-1 thru 5.3-33.................. Revision 18 Page 6.4.1 -1................................... Revision 18 Pages 5.4-1 thru 5.4-4 1.................. Revision 18 Pages 6.4.2-1 thru 6.4.2-11............ Revision 18 Pages 5.5-1 thru 5.5-6 1.................. Revision 18 Pages 6.4.3-1 thru 6.4.3-29............ Revision 18 Page 5.6-1...................................... Revision 18 Pages 6.4.4-1 thru 6.4.4-30............ Revision 18 Pages 5.6. 1-1 thru 5.6. 1-9.............. Revision 18 Pages 6.5-1 thru 6.5-2.................... Revision 18 Pages 5.6.2-1 thru 5.6.2-20............ Revision 18 Pages 6.5.1-1 thru 6.5.1 -2 1............ Revision 18 Pages 5.6.3-1 thru 5.6.3-1 3............ Revision 18 Pages 6.5.2-1 th ru 6.5.2-20............ Revision J 8 Pages 5.6.4-1 thru 5.6.4-34............ Revision 18 Pages 6.6-1 thru 6.6-2.................... Revision 18 Page 5.6.5-1................................... Revision 18 Pages 6.7-1 thru 6.7-333................ Revision 18 Pages 5.6.6-1 thru 5.6.6-57............ Revision 18 Page 6.8-1...................................... Revision 18 Page 5.7-1...................................... Revision 18 Pages 6.8. 1-1 thru 6.8. 1-6.............. Revision 18 Pages 5.7.1-1 thru 5.7. 1-5.............. Revision 18 Pages 6.8.2-1 thru 6.8.2-2.............. Revision 18 Pages 5.7.2-1 thru 5.7.2-5.............. Revision 18 Pages 6.8.3-1 thru 6.8.3-20............ Revision 18 Pages 5.7.3-1 thru 5.7.3-1 O............ Revision 18 Pages 6.8.4-1 thru 6.8.4-34............ Revision 18 Pages 5.7.4-1 thru 5.7.4-14............ Revision 18 Pages 6.8.5-1 thru 6.8.5-34............ Revision 18 Page 5.7.5-1................................... Revision 18 Page 6.8.6-1................................... Revision 18 Pages 5.7.6-1 thru 5.7.6-22............ Revision 18 Pages 6.8.7-1 thru 6.8.7-27............ Revision 18 Page 5.8-1...................................... Revis ion I 8 Page 6.9-1...................................... Revision 18 Pages 5.8. 1-1 thru 5.8.1-9.............. Revision 18 Page 6.9.1 -1................................... Revision 18 Pages 5.8.2-1 thru 5.8.2-7.............. Revision 18 Page 6.9.2-1................................... Revision 18 Pages 5.8.3-1 thru 5.8.3-6.............. Revision 18 Pages 5.8.4-1 thru 5.8.4-3.............. Revision 18 Chapter 7 Pages 5.8.5-1 thru 5.8.5-4.............. Revision 18 Pages 5.8.6-1 thru 5.8.6-5.............. Revision 18 Pages 7-i thru 7-ii.......................... Revision 18 Pages 5.8.7-1 thru 5.8.7-5.............. Revision 18 Page 7-1 thru 7-3........................... Revision 18 Pages 5.8.8-1 thru 5.8.8-5.............. Revision 18 Pages 7. 1-1 thru 7. 1-1 8.................. Revision 18 Pages 5.8.9-1 thru 5.8.9-26............ Revision 18 Pages 7.2-1 thru 7.2-5.................... Revision 18 Pages 5.9-1 thru 5.9-6................. Revision I 8C Pages 7.3-1 thru 7.3-10.................. Revision 18 Pages 5. 10-1 thru 5. I 0-3............. Revision I 8C Pages 7.4-1 thru 7.4-1 I.................. Revision 18 Page 7.5-1...................................... Revision 18 Chapter 6 Pages 7.6-1 thru 7.6-6.................... Revision 18 Pages 6-i thru 6-ix......................... Revision 18 Pages 6.1 -1 thru 6. 1-6.................... Revision 18 Pages 6.2-1 thru 6.2-1 1.................. Revision I 8 6 of 7

NAC-STC SAR Docket No. 71-9235 Chapter 8 List of Effective Pages (continued)

Page 8-i thru 8-ii........................... Revision 18 Page 8-1........................................ Revision 18 Pages 8.1-1 thru 8.1-11................. Revision 18 Pages 8.1-12 thru 8.1-25............. Revision l 8C Pages 8.1-1 thru 8.1-38................. Revision 18 Pages 8.2-1 thru 8.2-8................... Revision 18 Page 8.3-1..................................... Revision 18 Pages 8.4-1 thru 8.4-9................... Revision 18 Chapter 9 Page 9-i......................................... Revision 18 Pages 9-1 thru 9-13....................... Revision I 8 7 of 7 April 2018 Revision l 8C

THISPAGEINTENTIONALLYLEFTBLANK

NAC-STC SAR Docket No. 7 1-9235 NAC PROPRIETARY INFORMATION REMOVED April 20 18 Revision I 8C Table of Contents (continued) 5.7.4 Shielding Evaluation - STC-WVDP................................................................... 5.7.4-1 5.7.4. 1 Calculational Methods.......................................................................... 5.7.4-l 5.7.4.2 MCNP Flux-to-Dose Rate Conversion Factors................................... 5.7.4-1 5.7.4.3 1-fLW Dose Rates.................................................................................. 5.7.4-1 5.7.5 References - STC-WVDP.................................................................................... 5.7.5-1 5.7.6 Sample Input Files-STC-WYDP....................................................................... 5.7.6-1 5.8 Shielding Evaluation - Directly Loaded STC-1 JBU Evaluation........................................ 5.8-1 5.8.1 Discussion and Results - STC with HBU........................................................... 5.8. 1-1 5.8. 1.1 Design Criteria...................................................................................... 5.8. 1-1 5.8.1.2 5.8. 1.3 Design Basis Fuel................................................................................. 5.8.1-2 Maximum STC-HBU Dose Rates........................................................ 5.8. l-2 5.8.2 Source Specification - STC-HBU....................................................................... 5.8.2-1 5.8.2.1 Directly Loaded Fuel Neutron Source................................................. 5.8.2-2 5.8.2.2 Directly Loaded Fuel Gamma Sources................................................ 5.8.2-3 5.2.1.3 Directly Loaded Fuel Source Axial Profiles........................................ 5.8.2-3 5.8.3 Model Speci tication - STC-HBU........................................................................ 5.8.3-1 5.8.4 5.8.5 5.8.6 5.8.7 5.8.8 5.8.9 5.8.3.1 Fuel Assembly Model........................................................................... 5.8.3-1 5.8.3.2 5.8.3.3 5.8.3.4 5.8.3.5 Directly Loaded Basket Model............................................................ 5.8.3-1 STC Model............................................................................................ 5.8.3-2 Detector Mesh Definition..................................................................... 5.8.3-2 Shield Regional Densities..................................................................... 5.8.3-3 Shielding Evaluation Methodology - STC-1 IBU............................................... 5.8.4-1 5.8.4. 1 Calculational Methods.......................................................................... 5.8.4-1 5.8.4.2 MCNP Flux-to-Dose Rate Conversion Factors................................... 5.8.4-2 Loading Tables-STC-HBU................................................................................ 5.8.5-1 Loading Configuration Results - STC-H BU................................ 5.8.6-1 Loading Configuration Results - STC-HBU................................ 5.8.7-1 Loading Configuration Results - STC-HBU................................ 5.8.8-J Sample Input Files - STC-H BU.......................................................................... 5.8.9-l 5.9 Shielding Evaluation - Directly Loaded STC-HBU Fuel, Flat Bed with Shielding Augmented Top Weldment and Reduced Lead Shielding Configuration........... 5.9-1 5.10 Shielding Evaluation - Directly Loaded Low Burn up Fuel, Flat Bed with Shielding Augmented Top Weldment and Reduced Lead Shielding Configuration......... 5.10-1 5-iii

AC-STC SAR Docket No. 71-9235 March 20 17 Revision 18 Figure 5. 1-1 Figure 5.1-2 Figure 5. 1-3 Figure 5.1-4 Figure 5.1-5 Figure 5. 1-6 Figure 5. 1-7 Figure 5.2-1 Figure 5.2-2 Figure 5.2-3 Figure 5.2-4 List of Figures Detector Locations for Yankee Class Canistered Fuel and GTCC Waste...... 5. 1-1 0 Maximum Dose Rate Locations fo r the Three-Dimensional Directly Loaded Fuel Analysis in Normal Conditions.................................................. 5.1 - 11 Design Basis Yankee Class Combustion Engineering Fuel Assembly.......... 5.1-1 2 Yankee GTCC Waste Container..................................................................... 5.1-1 3 Connecticut Yankee Design Ba is Fuel Assembly Source Region and Elevations........................................................................................................ 5.1 -14 Location of Maximum Dose Rates fo r CY-MPC Fuel and GTCC Waste in Normal Conditions of Transport................................................................. 5. 1-15 Location of Maximum Dose Rate for CY-MPC Fuel and GTCC Waste 111 ccident Conditions................................................................................... 5. 1-16 Directly Loaded Fuel Design Basis Burnup Profile....................................... 5.2-14 Directly Loaded Fuel Neutron and Gamma Source Pro files.......................... 5.2-15 Design Basis Yankee Class Fuel Burnup Profile............................................ 5.2-16 Yankee GTCC Waste Container Gamma Source Proi~le Based on Dose Rate Measure1nents......................................................................................... 5.2-17 Figure 5.2-5 Connecticut Yankee Design Basis Fuel Neutron and Gamma Burnup Profi !es............................................................................................................ 5.2-1 8 Figure 5.3-1 Three-Dimensional MCBEND Model fo r Directly Loaded Fuel -

ormal Conditions - Axial Detail............................................................................... 5.3-11 Figure 5.3-2 Three-Dimensional MCBEND Model for Directly Loaded Fuel - Accident Conditions - Axial Detail............................................................................... 5.3-12 Figure 5.3-3 Three-Dimensional MCBEN D Model for Directly Loaded Fuel - Radial De ta i I............................................................................................................... 5. 3-I 3 Figure 5.3-4 One-Dimensional Radial Shielding Model with Canistered Yankee Class Fuel........................................................................................................ 5.3-14 Figure 5.3-5 One-Dimensional Axial Shielding Model with Canistered Yankee Class Fuel........................................................................................................ 5.3-15 Figure 5.3-6 One-Dimensional Top Axial Model with Canistered Yankee la Fuel...... 5.3-1 6 Figure 5.3-7 One-Dimensional Radial Shielding Mode l with Canistered Yankee GTCC Waste................................................................................................... 5.3-17 Figure 5.3-8 One-Dimensional Bottom Ax ial Model with Canistered Yankee GTCC Waste................................................................................................... 5.3-18 5-iv

NAC-STC SAR Docket No. 71 -9235 NAC PROPIETARY INFORMATION REMOVED April 2018 Revision I 8C Figure 5.8.8-5 Figure 5.8.8-6 Figure 5.8.9-J Figure 5.8.9-2 Figure 5.8.9-3 Figure 5.9-1 Figure 5.9-2 Figure 5.9-3 Figure 5. 10-1 List of Figures (contin ued)

Surface Dose Rate Profile by Source Type for Loading-Nrm - 0.4 g/kg Cobalt Content................................................................ 5.8.8-4 1 m Dose Rate Profile by Source Type for Loading - Ace

- 0.4 g/kg Cobalt Content........................................................................ 5.8.8-4 STC-1-JBU MCNP Input File for ~

ormal Conditions Radial Biasing - Fuel Gamma Response from Energy Group 7............. 5.8.9-2 STC-HBU MCNP Input File for Accident Conditions Radial Biasing-Fuel Neutron Response from Energy Group 2........... 5.8.9-14 STC-HBU SAS2H Light Element Input File for 49 GWd/MTU Burnup, 2.7 wt.% Initial Enrichment, and Cool Time Range of 18 to 40 Years................................................................................................... 5.8.9-2 XZ VISED Slice for the STC with Reduced Lead..................................... 5.9-2 XY VISED Slice for the STC Augmented Top Weldment........................ 5.9-2 XZ VISED Slice for the STC Accident Condition Led Sump with Reduced Lead.............................................................................................. 5.9-3 XZ VISED Slice LBU Flat Bed with Non-Truncated Impact Lirniters..................................................................................................... 5. J 0-2 5-xii

NAC-STC SAR Docket No. 7 1-9235 List of Tables March 20 17 Revision 18 Table 5. 1-1 Type, Form, Quantity and Potential Sources of the Fuel Used for Design Basis Directly Loaded and Canistered Fuel.................................................... 5. 1-17 Table 5.1 -2 Design Basis Canistered Fuel - Physical Parameters...................................... 5.1-19 Table 5. 1-3 Nuclear Parameters of the Canistered Fuels and GTCC Waste............................................................................................ 5.1-20 Table 5.1-4 Directly Loaded Fuel Maximum Dose Rates for Normal Conditions of Transport..................................................................................................... 5.1-21 Table 5. 1-5 Directly Loaded Fuel Maximum Dose Rates for Hypothetical Accident Conditions....................................................................................................... 5.1-22 Ta ble 5. 1-6 Combined Top, Radial Midplane, and Bottom Canistered Yankee Class Fuel Dose Rates for Normal Conditions of Transport.................................... 5. 1-23 Table 5. 1-7 Combined Top, Radial Midplane, and Bottom Canistered Yankee Class Fuel Dose Rates for Hypothetical Accident Conditions................................. 5.1-24 Table 5. 1-8 Can istered Yankee GTCC Waste Dose Rates for Norma l Conditions of Transport......................................................................................................... 5.1-25 Table 5. 1-9 Canistered Yankee GTCC Waste Dose Rates for Hypothetical Acc ident Conditions........................................................................................ 5. 1-26 Table 5. 1-10 Connecticut Yankee Stainless Steel Clad Fuel Max imum Dose Rates for Normal Conditions of Transport..................................................................... 5.1-27 Table 5. 1-1 I Connecticut Yankee Zircaloy Clad Fuel Maximum Dose Rates fo r Normal Conditions of Transport..................................................................... 5. 1-28 Table 5.1-1 2 Connecticut Yankee Stainless Steel Clad Fuel Max imum Dose Rates for Hypothetical Accident Conditions............................................................ 5. 1-29 Table 5. 1-1 3 Connecticut Yankee Zircaloy Clad Fuel Maximum Dose Rates fo r Hypothetical Accident Conditions.................................................................. 5. 1-29 Table 5.1 -14 Connecticut Yankee GTCC Waste Maximum Dose Rates fo r Normal Cond itions of Transport.................................................................................. 5. 1-30 Table 5. 1-15 Connecticut Yankee GTCC Waste Maximum Do e Rates fo r Hypothetical Accident Conditions.................................................................. 5. 1-30 Table 5.2-1 Directly Loaded Three-Dimensional PWR Reference Fuel Assembly Descriptions.................................................................................................... 5.2-19 5-x iii

NAC-STC SAR Docket No.7 1-9235 NAC PROPRIETARY INFORMATION REMOVED April 2018 Revision I 8C List of Tables (continued)

Table 5.8.5-5 Loading Source Terms for Maximum Dose Rates -

Accident Conditions..................................................................................... 5.8.5-3 Table 5.8.5-6 Loading Source Terms for Maximum Dose Rates -

Norn1al Conditions....................................................................................... 5.8.5-3 Table 5.8.5-7 Loading Source Terms for Maximum Dose Rates -

Accident Conditions..................................................................................... 5.8.5-4 Table 5.8.6-1 Loading Maximum Dose Rates for Normal Conditions........ 5.8.6-5 Table 5.8.6-2 Loading Maximum Im Dose Rates for Accident Conditions.................................................................................................... 5.8.6-5 Table 5.8.7-1 Loading Maximum Dose Rates for Normal Conditions........ 5.8.7-5 Table 5.8.7-2 Loading Maximum I 111 Dose Rates for Accident Conditions.................................................................................................... 5.8.7-5 Table 5.8.8-1 Loading Maximum Dose Rates for Normal Conditions........ 5.8.8-5 Table 5.8.8-2 Loading Maximum Im Dose Rates for Accident Conditions.................................................................................................... 5.8.8-5 Table 5.9-1 HBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead -

........................................... 5.9-4 Table 5.9-2 HBU Flat Bed Change in Cool Time [years] with Augmented Top Weldmenl and Reduced Lead -

.......................................... 5.9-5 Table 5.9-3 HBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead -

........................................... 5.9-6 Table 5.10-1 LBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead....................................................................... 5.10-3 5-xix

NAC-STC SAR Docket No. 71-9235 NAC PROPRlETARY INFORMATION REMOVED Apri l 2018 Revision I 8C 5.9 Shieldin~ Evaluation -

Directly Loaded STC-HBU Fuel. Flat Bed with Shielding Augmented Top Weldment and Reduced Lead Shielding Configuration Using the same methodology discussed in Sections 5.8.6, 5.8.7 and 5.8.8 the directly loaded STC is evaluated with an alternative (shielding augmented via an optional shield plate) top weldment and reduced lead shielding requirement in the cask top forging area.

The reduction in lead is modeled as a 0.65-inch thick and 10-inch tall void around the top outer circumference of the lead shield. This 10-inch void starts at the bottom surface of the Fiberfrax coverplate, which results in the void extending J 0.18 inches from the bottom of the upper forging as illustrated in Figure 5.9.1. The lead insulation is also modeled as void. A VJSED sl ice of the modified lead shield is shown in Figure 5.9-1. The alternative top weldment is augmented with additional sh ield plates.

A VlSED slice of the modeled augmented top wcldment is shown in Figure 5.9-2.

STC partial loadings are evaluated. Cobalt impurity levels of 0.4, 0.8, and 1.2 g/kg arc evaluated. The resulting cool time tables are compared to the cool time tables from Section 5.8. 1-2, with cool times rounded up to the nearest tenth of a year. The change in cool times are shown in Table 5.9-1. Increased cool times do not exceed 0.1 years. This difference can be attributed to the statistical uncertainty in the mesh tally resu Its.

The accident condition lead slump is evaluated with the augmented top wcldment and reduced lead volume. A VISED slice of the lead slump with the reduced lead volume is shown in Figure 5.9-3. Note that lead slumps in both the radial and axial directions are modeled for all cases, conservatively increasing the lead void. All accident condition dose rates remain below the limit of I 000 mrem/hr at I meter. The maximum accident condition dose rate is 818 mrem/hr for the loading with 0.4 g/kg cobalt impurity.

5.9-1

NAC-STC SAR Docket No. 7 1-9235 NAC PROPRJETARY 1NFORMAT10N REMOVED Figure 5.9-1 XZ VISED Slice for the STC w ith Reduced Lead

~--~--J Figure 5.9-2 XY VISED Slice for the STC Augmented Top Weldment 5.9-2 April 2018 Revis ion I 8C

NAC-STC SAR Docket No. 71 -9235 April 2018 Revision I 8C Figure 5.9-3 XZ VISED Slice for the STC Accident Condition Lead Slump with Reduced Lead 5.9-3

AC-STC SA R Docket o. 71-9235 NAC PROPRI ETA RY I FORMATION REMOVED April 20 18 Revision I 8C Table 5.9-1 HBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead - -

Min. initial Assembly /\\vcragc Burnup IGWd/MTUl Cobalt

[g/kgl Assembly Avg.

B:S46 46<B:S4 7 4 7<13:S48 48<B:S49 49<B:S50 50<13:S5 I 51 <B:S52 52<B:S53 53<B:S54 54<B:S55 55<B:S56 56<B:S57 57<B:S58 58<13:S59 59<B:S60 Enr. iwt.%1 2.9:SE<3. I 0.0 0.0 0.0

-0. 1

-0.2

-0. 1

-0.2

3. l<E<3.3 0.0 0.0 0.0 0.0

-0.1

-0.2

-0.2 3.3:SE<3.5 0.0 0.0 0.0 0.0 0.0

-0.1

-0.2

-0.2 3 5:SE<3.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0

-0. 1

-0.1

-0.2

-0.2 3.7<E<3.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

-0.1

-0. 1

-0.1

-0.2

-0.2 0.4 3.9<E<4. I 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

-0.1

-0.2

4. l<E<4.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

-0. 1

-0.2

-0.2 4.3:SE<4.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

-0. 1

-0. 1 4.5<E<4.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.7<E<4.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.9<E 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.9<E<3. I

-0.4

-0.3

-0.4

-0.3

3. 1 :SE<3.3

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

-0.3 3.3<E<3.5

-0.3

-0.4

-0.3

-0.4

-0.3

-0.3 3.5<E<3.7

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

-0.3 3.7<E<3.9

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

-0.2 0.8 3.9:SE<4. I 0

-0.2

-0.3

-0.4

-0.3

-0.4

4. l<E<4.3 0

0

-0.2

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4 4.3<C<4.5 0

0 0

-0.2

-0.3

-0.4

-0.3

-0.4

-0.3 4.5:SC<4.7 0

0 0

0

-0. 1

-0.2

-0.3

-0.3 4.7<E<4.9 0

0 0

0

-0.2

-0.3

-0.2

-0.3

-0.3 4.9<E 0

0 0

-0.1

-0.2

-0.3

-0.4 2.9<E<3. I

-0.4

-0.5

-0.4

-0.3

3. l<E<3.3

-0.5

-0.4

-0.4 3.3:SE<3.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.3

-0.3 3.5<C<3.7

-0.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.4 3.7<E<3.9

-0.4

-0.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.3 1.2 3.9:SE<4. I

-0.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.3

-0.4

-0.3

4. l<E<4.3

-0.4

-0.5

-0.4

-0.3

-0.4

-0.4 4.3<E<4.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.5

-0.4

-0.4 4.5:SE<4.7

-0.4

-0.3

-0.4

4. 7:SE<4.9

-0.3

-0.4

-0.4 4.9<E

-0.3

-0.4

-0.4 5.9-4

e NAC-STC SA R NAC PROPRI ETARY l FORMATIO REMOVED April 201 8 Docket No. 7 1-9235 Revision I 8C Table 5.9-2 HBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead -

Min. initial Assembly Average Burnup rGWd/MTU J Cobalt Jg/kg l Assembly /\\ vg.

B:S46 46<B:S47 47<B:S48 48<B:S49 49<B:S50 50<B:S5 I 51<B:S52 52<B:S53 53<B:S54 54<B:S55 55<8:S56 56<B:S57 57<B:S58 58<B:S59 59<B:S60 Enr. [wt. %1 2 9:SE<3 I 0.0

-0.2

-0. 1 0.0

3. 1<[ <3.3

0. 1 0.1

-0.2

-0.1

-0. 1

-0. 1 0.0 3.3<[ <3.5 0.0 0.0 0.0

0. 1

-0.1

-0.2

-0.1

-0.2

-0.1

-0.2

-0. 1

-0. 1 3 5:SE<3. 7 0.0

0. 1

0. 1 0.0

-0. 1

-0.2

-0. 1

-0. 1 0.0 0.0 3.7:SE<3.9 0.0 0.0 0.0 0.0 0.1 0.0 0.0

-0. 1

-0.2

-0.1

-0.2

-0. 1 0.0 0.0 0.4 3.9<E<4. I 0.0

0. 1

0. 1 0.0 0.0

0. 1

0. 1 0.0

-0. 1

-0.2

-0. 1

4. l<E<4.3 0.0 0.0 0.0 0.0 0.0 0.1 0.0

0. 1

-0.2

-0. 1

-0. 1 4.3:SE<4.5 0.0

0. 1 0.0 0.0 0.0 0.0

0. 1 0.0 0.0 0.0 0.1

-0. 1

-0. 1 4.5<E<4.7 0.0 0.0 0.0 0.1

0. 1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1

-0.1

-0. 1 4.7<E<4.9 0.0 0.0 0.0 0.0 0.0 0.0

0. 1 0.0 0.0

0. 1 0.0 0.0 0.0 0.0

-0. 1 4.9<E 0.0

0. 1

0. 1 0.0 0.0 0.0 0.0

0. 1 0.0 0.0 0.1 0.0 0.1 0.0 2.9<E<3. I

-0.5

-0.4

-0.3

-0.2

3. l:SE<3.3

-0.5

-0.4

-0.3

-0.2

-0.2 3.3<E<3.5

-0.5

-0.4

-0.5

-0.4

-0.3

-0.2 3.5<E<3.7

-0.4

-0.5

-0.4

-0.3

-0.2

-0.2 3.7<E<3.9

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

-0.2

-0.2 0.8 3.9<E<4. 1

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3

4. l<E<4.3

-0. 1

-0.3

-0.4

-0.5

-0.4

-0.3

-0.2 4.3:SE<4.5 0.0 0.0

-0.2

-0.3

-0.4

-0.3

-0.4

-0.3 4.5<E<4.7 0.0 0.0 0.0 0.0

-0.3

-0.4

-0.3

-0.4

-0.3

-0.4

-0.3 4.7<E<4.9 0.0 0.0 0.0 0.0 0.0

-0.3

-0.4

-0.4 4.9<E 0.0 0.0

0. 1 0.0 0.0 0.0

-0. 1

-0.3

-0.4

-0.3

-0.4

-0.3 2.9<E<3. I

-0.5

-0.4

-0.5

-0.4

-0.3

-0.4

3. l<E<3.3

-0.5

-0.6

-0.4

-0.3

-0.4

-0.3

-0.3 3.3<E<3.5

-0.6

-0.5

-0.6

-0.5

-0.4

-0.3

-0.4

-0.3 3.5<E<3. 7

-0.5

-0.6

-0.5

-0.4

-0.3

-0.2

-0.2 3.7<[ <3.9

-0.6

-0.5

-0.6

-0.5

-0.4

-0.3

-0.4

-0.3 1.2 3.9<[ <4. I

-0.5

-0.6

-0.4

-0.5

-0.4

-0.3

-0.4

-0.3 4.1 <[ <4.3

-0.5

-0.6

-0.5

-0.4

-0.3

-0.4 4.3<E<4.5

-0.5

-0.6

-0.5

-0.4

-0.5

-0.4

-0.3 4.5<E<4.7

-0.5

-0.4

-0.5

-0.6

-0.5

-0.4

-0.4 4.7<E<4.9

-0.5

-0.4

-0.5

-0.6

-0.5

-0.4 4.9<E

-0.4

-0.5

-0.4 5.9-5

NAC-STC SA R Docket No. 71-9235 AC PROPRIETARY I FORMATION REMOVED April 2018 Revision I 8C Table 5.9-3 HBU Flat Bed Change in Cool Time ryears] with Augmented Top Weldment and Reduced Lead--

Min. initial Asscmblv t\\ vcrn!!C Burnuo IG\\\\'d/MTU I Cobalt Asscmbl) t\\ vg.

fg/kgl Enr. !111. %]

13$46 46<13$47 47<B:::48 48<B:::49 49<B$50 50<13$51 51 <13:::52 52<8 :c:53 53<B:c:5-l 54<B$55 5S<B$56 56<13$57 57<B$58 58<13$59 59<13$60 2.9<E<3. I

-0.2

-0.3

-0..J

-0.6

-0.7

-0.8

-0.9

-1.0

-0.9

3. 1$E<3.3

-0.3

-OA

-0.5

-0.7

-0.R

-1.0

-0.9

-0.7 3.3<E<3.5

-0.2

-0.3

-0.2

-0.3

-0.4

-0.5

-0.6

-0.7

-0.9

-1.0

-0.9 3.5<E<3.7

0. 1

-0.1

-0.3

-0.2

-0.3

-0.4

-0.6

-0.8

-0.9

-1. I

-0 8

-0.7

-0 7 3.7<E<3.9 0.0

0. 1 0.1

-0 3

-0.2

-0.3

-0...1

-0.6

-0. 7

-0.8

-0.9

-1.0

-0.9

-0.8 0.4 3.9< E.-::4.1 0.0 0.0 0.0 0.0

-0. 1

-0.2

-0.-1

-0.5

-0.6

-0.7

-0.8

-1.0

-0.9 4.l <E<.U 0.1 0.1 0.1 0.0 0.0 0.1

-0.2

-0.3

-0.4

-0.5

-0.6

-0.8

-0.9

-0.9 4.3<E<4.5 0.0 0.0 0.0 0.1

0. 1 0.0 0.1 0.0

-0.2

-0.3

-0.4

-0.6

-0.8

-0.8 4.5<E<4.7 0.0

0. 1 0.0 0.0 0.0 0.1 0.1 0.1 0.0

-0.2

-0.3

-0.4

-0.5

-0.6

-0.7 4.7$E<4.9 0.0

0. 1 0.0 0.1 0.0 0.0 0.0 0.1 0.0

0. 1 0.0

-0.2

-0.3

-0.4

-0.6 4.9<E 0.1 0.0 0.0 0.0 0.0 0.1 0.0 0.1

0. 1

0. 1 0.0

0. 1

-0.3

-0.4

-0.4 2.9<E<3. I

-0 4

-0.4

-0.J

-0.5

-0.7

-0.8

-0.8 3.l<E<3.3

-0.S

-0.5

-0.4

-0.3

-0.4

-0.5

-0.7

-0.9

-1.0 3.3<E<3.5

-0.5

-0.4

-0.3

-0.4

-0.5

-0.6

-0.9

-0.9 3.5<E<3.7

-0.5

-0.4

-0.5

-0.7

-0.8

-0.9

-1.0

-1.0 3.7<E<3.9

-0.2

-0.6

-0.5

-0.4

-0.3

-0.4

-0.5

-0.7

-0.8

-0.9 0.8 3.9<E<4.I

-0.1

-0.2

-0.5

-0 5

-0.5

-0.4

-0.5

-0.6

-0.7

-0.8 4.1$E<4.3

-0.1

-0.2

-0.5

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-0.5

-0.4

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-0.4

-0.5

-0.6

-0.7 4.3<E<4.5 0.0 0.0

-0.1

-0.2

-0.5

-0.4

-0.5

-0.4

-03

-0.5

-0.5 4.5<E<4.7 0.0 0.0 0.0

-0.1

-0.2

-0.5

-0.4

-0.3

-0.4

-0.3

-0.5 4.7<E<4.9 0.0 0.0 0.0 0.0 0.0

-0.3

-0.5

-0.4

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-0.5

-0.4

-0.5

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-0.4

-03

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-0.5

-0.4

-0.5

-0.6

-0.7 3.l<E<3.3

-0.6

-0.4

-0.5

-0.4

-0.6

-0.7

-0.9 3.3<E<3.5

-0.3

-0.6

-0.5

-0.4

-0.5

-0.6

-0.7 3.5<E<3.7

-0.2

-0.4

-0.5

-0.4

-0.5

-0.7

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-0. 1

-0.2

-0.3

-0.5

-0.6

-0.5

-0.4

-0.5

-0.3

-0.4

-0.6

-0.7

-0.8 1.2 3.9$E<4. I 0.0

-0. 1

-0.2

-0.3

-0.4

-0.6

-0 5

-0.4

-0.5

-0.4

-0.6

-0.6 4.1 <E<4.3 0.0 0.0

-0.1

-0. 1

-0.2

-0.5

-0.4

-0.5 4.3<E<4.5 0.0

-0. 1 0.0

-0.1

-0.2

-0.5

-0.4

-0.4 4.5<E<4.7

-0.1 0.0 0.0 0.0

-0. 1

-0 I

-0.2

-0.S

-0 5

-0.5

-0.4

-0.5

-0.4

-0.4 4.7:SE<4.9 0.0 0.0 0.0 0.0

-0.1

-0.2

-0.5

-0.6

-0.4

-0 3 4.9::,E 0.0

-0. 1 0.0 0.0 0.0 0.0

-0.1

-0 2

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0.6

-0.5

-0.4

-0.4 5.9-6 e

NAC-STC SAR Docket No. 7 1-9235 Apri l 20 18 Revision I 8C

5. 10 Shielding Eva luation -

Directly Loaded Low Burnup Fuel. Flat Bed with Shielding Augmented Top Weldment and Reduced Lead Shielding Configuration The alternative (shielding augmented via an optional shield plate) top weldment and reduction in lead shielding, described in Section 5.9, is evaluated with low burnup fuel (:S 45 GWd/MTU).

Add itional model updates are implemented to conform to the MCBEN D analysis (Sections 5. 1 through 5.5).

Non-truncated impact limiters Low burnup axial source profile (shown in Table 5.2-5)

Zircaloy in the lower nozzle and upper plenum homogenization (Table 5.3-4)

A neutron source multiplier of 1.6667 (based on a kcrr of 0.4) in lieu of MCNP-calcu lated subcritical multiplication (Section 5.2.1.1 ).

A VISED slice of the cask model is shown in Figure 5.10- 1. The reduced lead vo lume and alternative top weldment are shown in Figure 5.9-1 and Figure 5.9-2, respectively.

The difference in required cool time between the nominal model and the model with augmented top weldment and reduced lead is shown Table 5.10-1. All cool times remain the same or decrease with the augmented top weldment and reduced lead volume. The results use a 1.2 g/kg coba lt impurity.

The augmented top weldment and reduced lead acc ident results for HBU fuel from Section 5.9 show a significant margin to limits (- 200 mrem/hr). The maximum 1 meter accident condition dose rate occurs over the middle of the fuel region and is dominated by the fuel neutron source.

As the fue l neutron source is reduced with lower burnup, the low burnup fue l accident condition dose rates will remain below limits.

5. 10-1

NAC-STC SA R Docket No. 71-9235 April 2018 Revision I 8C Figure 5. I 0- 1 XZ VISED Slice L BU Flat Bed with Non-Truncated Impact Limiters 5.1 0-2

NAC-STC SAR Docket No. 71-9235 Apri l 20 18 Revision l 8C Table 5.10- 1 LBU Flat Bed Change in Cool Time [years] with Augmented Top Weldment and Reduced Lead Enr.

Burn up [GWd/MTU]

[wt.%]

B$30 30<8$35 35<B$40 40<B$45 1.7 SE<l.9

-0.5

-0.7 l.9 S E< 2.1

-0.4

-0.6

-1.7 2.1 S E< 2.3

-0.4

-1.5 2.3 s E < 2.5

-0.3

-0.4

-1.4

-1.9 2.5 S E< 2.7

-0.3

-0.4

-0.8

-1.7 2.7 SE<2.9

-0.3

-0.4

-0.7

-1.7 2.9 S E<3. l

-0.3

-0.4

-0.5

-1.6 3.1 S E<3.3

-0.2

-0.3

-0.4

-1.4 3.3 s E < 3.5

-0.3

-0.4

-1.2 3.5SE<3.7

-0.2

-0.3

-0.4

-1.0 3.7 SE<3.9

-0.1

-0.2

-0.4

-0.6 3.9SE<4. l

-0.2

-0.4

-0.5 4.1 S E<4.3

-0.1

-0.2

-0.3

-0.4 4.3 S E<4.5

-0.1

-0.2

5. 10-3

THIS PAGE INTENTIONALLY LEFT BLANK

NAC-STC SAR Docket No. 71-9235 March 2017 Revision l 8 The removable transport impact limiters consist of redwood and balsa wood. License drawings and the supporting analyses specify the crush strengths of the redwood and balsa wood to be 6240 psi +/- 620 psi and 1550 psi +/- 150 psi respectively. For manufacturing purposes, verification of the impact lim iter material is accomplished by verifying the densities of the wood. Three samples fro m each redwood board are to be tested for density, and the average density of the samples shall be 23.5 +/- 3.5 pounds/cubic foot. Each 15-degree and 30-degree pie shaped section of the impact limiter shall have a density of 22.3 +/- 1.2 pounds/cubic foot in accordance with the License Drawings. The moisture content for any single redwood board must be greater than 5 percent, but less than 15 percent. The average moisture content for a lot of redwood used in impact limiter construction must not be greater than 12 percent.

Following final closure welding of the transport impact limiter stainless teel shell, a leak test of the shell welds shall be performed to verify weld integrity. The test shall be performed by evacuating the impact limiter to 75 mbar and perform ing a 30-minute test to determine if there is any increase in the impact limiter pressure. Any detected leak shall not exceed I x I 0-2 cm3/sec.

Jf a leak exceeding this value is detected, the cause of the leak shall be determi ned, and the weld repaired and retested.

8. 1.5

8. 1.5.1 Tests fo r Shielding Integrity Gamma Shield Test The gamma scan test shall be conducted by continuous scanning or probing over I 00 percent of all accessible cask surfaces using a 3-inch detector and a 6°Co source. The source strength shall be of an intensity sufficient to produce a count rate that equals or exceeds three times the background count rate on the external surfaces of the cask. The count rate shall be maintained for greater than one minute prior to the start of scann ing. The detector scan path spac ing (cask exterior surface) will be a maximum of 2.5 inches and the scanning speed will be 4.5 feet per minute or less. The source scan path spacing (cask interior surface) will be on a 2-inch grid pattern (when using a 3-inch detector). Flat surfaces, such as the cask bottom and closure lids, will use a 2.5 inch pacing for both the detector and source scan paths (when us ing a 3-inch detector).

The acceptance criteria for the shield te t will be that the shield effectiveness of the cask body and lids shall be equal to or greater than the shield effectiveness of a lead and steel mock-up. The steel thickness of the mock up shall be equivalent to the minimum steel thickness specified on the

8. 1-11

NAC-STC SAR Docket No. 7 1-9235 Apri l 20 18 Revision I 8C License Drawings and the lead thickness shall be equivalent to the minimum lead thickness specified in the License Drawings less 3 percent. The shielding mock-up will be produced using the same fabrication techniques as those approved for the cask.

Measured count rates that exceed those established by the test mock-up shall cause the component to be rejected, with exception to the alternate acceptance criteria as specified in Section 8.1.5.1.1 fo r the Fiberfrax region of the lead. The rejected areas/components shall be evaluated to determine the corrective action to be taken. Any repaired areas shall be retested prior to acceptance.

An additional gamma shield effectiveness test shall be performed on each cask fo llowing first fuel load ing. The neutron and gamma shield effectiveness test procedures and acceptance criteria are described in Section 8.1.5.4.

8. 1.5. 1.1 Alternate Acceptance Criteria (Fiberfrax Region)

In the region of the Fiberfrax insulation, which is defined as the upper I 0.18 inches of the cask upper lead region, a reduced lead thickness eq uivalent to 0.65 inches is acceptable for directly loaded fue l shipments. However, the cask shall be used with the optional shield plate on the basket top weldment as detailed in drawing 423-872, which compensates for this reduced lead shielding.

8.1.5.2 Neutron Sh ielding Test The neutron shielding of the NAC-STC is provided by a solid layer of NS-4-FR, which is a hard polymer material. A 5.5-inch layer of NS-4-FR is located in the annulus formed by the outer shell and the 0.236-inch (6 mm) thick neutron shield shell. The neutron shield is divided in sections by the copper/stainless steel fins. A 2-inch thick layer of NS-4-FR is also installed in the cask inner lid and in the cask bottom.

The insta llation of NS-4-FR material in the fabrication of the cask is a special process and, as such, procedures will be prepared and qualified to ensure that the mix ratios, mixing method, degassing, pouring, and curing of the material is properly performed. The NS-4-FR raw material i provided in the form of a 3-part mixing kit. The material content of the raw material is tested and certified at the time of kit preparation. The neutron shielding material is insta lled into the annulus between the outer shell and the neutron shield shell by pouring it with the cask in an inverted vertical position. Prior to installation, samples from each mix of the actua l material 8.1-12

NAC-STC SAR Docket No. 71-9235 April 201 8 Rev ision 18C being poured into the annulus are wet density tested to ensure that the material is properly mixed.

Mixes that do not meet the wet density acceptance criteria are rejected. Procedures used fo r installation of the material are validated prior to use by destructive examination of a fu ll scale mock-up of the neutron shield cavity. Qualification of the installation procedure verifies material homogeneous properties and minimizes the potential deleterious voids.

8.1.5.3 Neutron Shielding Material Testing The neutron shield properties of NS-4-FR are prov ided in Chapters I and 3. Each lot (mixed batch) of neutron shield material shall be tested to verify that the hydrogen concentration, boron concentration, and neutron shield density meet the requirements specified in Chapters I and 3 and the License Drawings. Testing shall be performed by qualified laboratorie in accordance with written and approved procedures.

Hydrogen concentration, boron concentration, and density data for each lot of neutron shield material shall become part of the quality record documentation package.

Dimensional inspection of the cavities containing the neutron shielding material shall ensure that the requi red thickness pecified in the License Drawings is incorporated into the cask.

The installation of the neutron shielding material shall be performed in accordance with written, approved, and qualified procedures. The procedures shall ensure that mix ratios and mixing methods are contro lled in order to achieve proper material composition, boron concentration and di tribution, and that pours are contro lled in order to prevent gaps or unacceptable voids fro m occurring in the material. Procedures shall be qualified by the use of mock-ups to ensure that the N FR installation d es not result in the creation of unacceptable voids. Wet density data for each mix of installed neutron shield material shall be mainta ined as part of the quality rec rd documentation package.

8. 1.5.4 Neutron and Gamma Shield Effecti venes Tests Fo llowing first fuel loading, a neutron and gamma shield effecti veness test shall be performed for each cask prior to transport. The test shall be performed with the cask loaded with fuel, drained, vacuum dried and backfilled with helium.

The purpose of the test is to document the effectiveness of the neutron and gamma shielding materials. The test shall be perfo rmed in accordance with detai led, approved written test procedures.

8. 1-1 3

NAC-STC SA R Docket o. 71-9235 April 20 18 Revision I 8C Ca librated neutron and gamma dose rate meters shall be used to measure the neutron and gamma dose rate at contact with the outer shell of the neutron shield and at 2.3 meters from the surface (equivalent to 2 meters from the sides of the ra ilcar).

Dose measurement points shall be established on the external surface of the shell at 30° intervals and at five points along the height of the shield (a total of 60 measuring points).

In addition, neutron and gamma dose rate measurements shall be made of the trunnion areas above the neutron shield, at fo ur points below the neutron shield, and at the edges and center of the cask top (outer lid) and cask bottom surfaces. Dose rates at the top and bottom of the cask shall be measured with the transport impact limiters installed. The dose rates measured at contact and at 2.3 meters shall be recorded on the test data sheet, along with the total power of the loaded fuel assemblies; date, time and location of test; identification and calibration of instrumentation; and identification of test engineer and operators.

To allow an evaluation of the measured dose rates to be completed, the burnup and cool time fo r the actual fuel as emblies loaded into the cask will be determined and recorded. From this fuel history data, the total actual neutron and gamma source terms will be estimated using ORI G N or similar calculations.

If the measured dose rates exceed the applicable regulatory limits, the licensee shall notify the NRC. Appropriate corrective measures will be taken, including fuel unloading and correction of the shielding deficiency.

Following corrective actions, the test will be re-performed to the original acceptance criteria prior to final acceptance.

8.1.6 Thermal Test Prior to acceptance at the factory, a thermal test shall be perfo rmed on each fa bricated packagi ng to confirm and verify that the fa bricated and assembled cask possesses the heat rejection capabilities predicted by the thermal analyses. The thermal test shall be perfo rmed in accordance with approved written procedures.

8.1.6.1 Thermal Test Set-up The thermal test set-up i shown in Figure 8. 1-1 (a). As depicted, the thermal test shall be performed with the cask positioned horizontally on a test frame. The transport impact limiter or equi valent insulating material shall be installed on each end of the cask to simulate the transport configuration. The cask will be located in a covered building in a still environment. The cask 8.1-14

AC-STC SAR Docket No. 71-9235 April 2018 Revision I 8C shall be assembled with the basket installed. A thermal test lid with connections for thermocouple leads and electric heater power cables shall be installed in place of the inner lid.

The outer lid will not be installed for the test. The thermal test lid will be prov ided with an 0-ring seal capable of containing the containment cavity helium atmosphere.

Electric heaters hall be installed in each fuel tube. The electric heaters will have an active length of between 120 and 150 inches and be capable of generating a minimum of 22 kilowatts (kw).

The heaters will be supported in the basket so as to not be in contact with the wa ll of the fuel tube. The power supplied to the heater will be recorded throughout the test duration.

Calibrated test thermocouples, with an accuracy of +/-2°F, will be installed on the cask basket, inner shell, and outer neutron shield shell surfaces. The location of the test thermocouples are shown in Figure 8.1-1. The specific location of the thermocouples are as fo l lows:

TC I - basket top steel weldment TC2 - steel disk at cask basket midpoint TC3 - aluminum disk at cask basket midpoint TC4 - basket bottom steel weldment TC5; TC6; TC7; and TC8 - located at 90° intervals on the inner shell urface at cav ity midpoint TC9 - top of inner hell surface at 30-40 inches from top of cavity TC IO - bottom of inner shell surface at 30 to 40 inches from base of the cav ity TC I I; TC 12; TC 13; and TC 14 - located at 90° intervals on the neutron shield shell surface (at fin tip) at cask midpoint TC 15 - top of neutron shield shell surface (at fin tip) at 30-40 inches from top of neutron shell TC 16 - bottom of neutron shield shell surface (at fin ti p) at 30-40 inche fro m bottom of neutron hield shell TC 17 - top of upper forging TC 18 - outer she I I surface at center! i ne of cask bottom face TC 19 - inner fuel tube wal I surface near the center of the cask basket TC20 - ambient temperature of testing area The output of the test thermocouples will be recorded throughout the test by a strip chart recorder.

8.1-15

NAC-STC SAR Docket o. 71-9235 8.1.6.2 Test Procedure April 20 18 Revision I 8C With the cask assembled and instrumented as described above, the cask cav ity is evacuated and backfilled to 1.0 atmosphere absolute ( 14.6 psia) with helium. Power will be applied to the heaters to simulate the cask contents. After initiation of power to the heaters, the temperatures of all thermocouples and heater power levels will be monitored and recorded on data sheets at 60 minute intervals. Power will be maintained to the electrical heaters until the cask has reached thermal equilibrium.

For the purpose of the test, thermal equilibrium is defined as being achieved when over two consecutive hours:

t.tTC13 ~ 2°F/hr, and tTc3 ~ 2°F/hr Based upon the thermal heat-up evaluation, thermal equi librium should be achieved 111 approximately fi ve days.

After verification of thermal equilibrium, final temperature measurements will be recorded for all test thermocouples. The fin al power readings for the electric heaters will also be recorded. The trip chart will be marked to indicate the time of the final cask measurement. The printout of the strip chart recorder and the completed test data heets will be incorporated into an approved final thermal test report. The test will be determined to be acceptable if the acceptance criteria of ection 8.1.6.3 are met.

If the acceptance criteria are not met, the cask wi II not be accepted unti I appropriate corrective actions are completed. Upon completion of correcti ve actions, the cask shall be retested to the original test requirements and acceptance criteria.

8.1.6.3 Acceptance Criteria The purpose of the thermal test is to confirm the heat rejection capabilities of the as-built cask are acceptable and correspond to the temperatures calculated by thermal analyses for the directly loaded (uncanistered) configuration presented in Chapter 3.0 of this application.

8. 1-1 6

NAC-STC SAR Docket No. 7 1-9235 Apri l 20 18 Revision I 8C Package heat dissipation acceptance testi ng assures: I) maximum material temperatures do not exceed material allowables; and that 2) measured temperature grad ients are less than the thermal gradients calcul ated in the package thermal analyses.

The thermal acceptance test is accepted when the fo llowing criteria are met:

I)

When corrected for physical test boundary conditions and heat load, the follow ing measured temperatures are not exceeded:

2)

TC No.

Location TCI Top Basket Steel Weldment TC3 TC2 TC4 TC5-TC8 TC I I-TC l4 TC17 TC l8 TCl9 Alum inum Disk Center Steel Support Disk Center Basket Bottom Steel Weldment Cask lnner Shell Neutron Shield Shell Cask Top Forging Cask Bottom Tube Wall Temperature °F 435 485 495 475 330 240 200 330 540 The measured temperature gradient across the central steel disk from TC2 to the average of TC5, TC6; TC7 and TC8 is less than 200°F;

3)

The measured temperature grad ient across the central aluminum disk fro m TC3 to the average of TC5; TC6; TC7 and TC8 is less than I 90°F; and

4)

The measured temperature gradient across the cask body as measured by thermocouple pairs TC5-TC 13; TC6-TC 14; TC7-TC I I; and TC8-TC l2 are less than 90°F.

8.1.7 Neutron Absorber Tests for NAC-STC Directly-Loaded Fuel Basket and for Yankee-MPC and CY-MPC Canistered Fuel Baskets Two alternate neutron poison materials, BORAL and TalBor, have been qualified by NAC for use in the NAC-STC directly loaded, the Yankee-MP( and the CY-MPC fue l baskets. For the NAC-STC directly loaded basket BORAL acceptance testing is described in this secti on (Section 8.1.7) while a generic metal matrix composite (aluminum based) and borated aluminum acceptance/qual ification program is described in Section 8.1.1 1.

The generic program is designed to demon trate structural, thermal, and nuclear requ irements are met without

8. 1-17

NAC-STC SAR Docket No. 71-9235 April 20 18 Revision I 8C specification of a particular manufacturer or material. TalBor, an MMC material, is excluded from the generic acceptance/qualification program, and is included in Section 8.1.7.

BORAL is manufactured by Ceradyne Corporation, Chicoutimi (Quebec), Canada under a Quality Assurance/Quality Control program in conformance with the requirements of 10 CFR 50, Appendix B. The manufacturing process consists of several steps: the first step is the mixing of the aluminum and boron-carbide powders that form the core of the finished material, with the amount of each powder a function of the desired JOB areal density. The methods used to control the weight and blend of the powders are patented and proprietary processes of AAR Advanced Structures (AAR) (subsequently Ceradyne). The mixture of powders is placed in an aluminum box with walls approximately one inch thick. The top lid is welded in place. This " ingot" is heated for several hours and then is hot-rol led to produce the sheet of design thickness. The rolling process densities and bonds the powder mixture. The aluminum box walls become the cladding for the Al-B4C core.

TalBor is manufactured by Talon Composites, Inc. (TalBor was formerly called Boralyn, and was produced by Alyn Corporation.

Alyn Corporation went out of business and Talon Composites acquired the major production equipment and the patent rights for Boralyn. TalBor is essentially identical to Boralyn.) TalBor is manufactured and controlled using a Quality Assurance program that is compliant with the applicable requirements of IO CFR 50, Appendix, B. Ta lBor is a metal matrix composite (MMC). The aluminum and B4C powders are mixed to the specified JOB areal density and the powder mixture is vacuum sintered and hot pre sed to achieve a full y dense billet. The billet is extruded, then cut and rolled to the design thickness.

After manufacturing, test samples from each batch of neutron absorber (po ison) sheets sha ll be tested to verify the presence, proper distribution, and minimum weight percent of JOB. Neutron transmission testing or augmented wet chemistry testing may be used.

The tests sha ll be performed in accordance with approved written procedures.

8.1.7.1 Neutron Absorber Material Sampling Plan The neutron absorber sampling plan is selected to demonstrate a 95/95 (95% probability and 95%

confidence level) statistical confidence level in the neutron absorber sheet material compliance with the specifi cation.

In addition to the specified sampling plan, each sheet of material is visually and dimensionally inspected using at least 6 measurements (along the edges near each corner and the longitudinal centerline) on each sheet. No rejected neutron absorber sheet is used.

The ampling plan is supported by written and approved procedures.

8.1-18

NAC-STC SA R Docket No. 71-9235 April 2018 Rev ision I 8C The sampling plan requires that a coupon sample be taken from each heet of the first set of I 00 heets of absorber material. Thereafter, coupon samples are taken fro m 20 randomly selected sheets fro m each set of 100 sheets. This I in 5 sampling plan continues until there is a change in lot or batch of constituent materials of the sheet (i.e., boron carbide powder, aluminum powder, or aluminum extrusion), or a process change, at which time the sampling process is reinitiated as previously described. The sheet samples are indelibly marked and recorded for identification.

This identification is used to document neutron absorber test results, which become part of the quality record documentation package.

8.1.7.2 Wet Chemistry Test Performance An approved fac il ity with chemical analysis capability shall be selected to perfo rm the wet chemistry tests. The tests will ensure the presence of boron and enable the calculation of the 108 areal density.

Acceptability of the uniformity of boron distribution is based on the manufacturer's material qualification tests.

The most common method of verifying the acceptability of neutron absorber material is the wet chemistry method-a chemical analysis where the aluminum is separated from a sample with known thickness and volume. The remaining boron-carbide material is weighed and the area l density of 108 is computed. A statistical conclusion about the BORAL or TalBor sheet from which the sample was taken and that batch of sheets may then be drawn based on the test results and the estab lished manufacturing processes previously noted.

BORAL and Talbor sheets are required to contain a minimum 0.020 g 10B/cm2 which is credited at 75% effectiveness in Chapter 6.

8.1.7.3 An approved fac ility with a neutron source and neutron detection capab ility shall be selected to perform the described tests, if the neutron absorption transmission te t method is used. The tests will assure that the neutron absorption capacity of the material tested i equal to, or higher than, the given reference value and will verify the unifo rmity of boron distribution. The principle of measurement of neutron absorption is that the presence of boron results in a reduction of neutron fl ux between the thermalized neutron source and the neutron detector-depending on the material thickness and boron content.

8.1-1 9

NAC-STC SAR Docket No. 71-9235 April 20 18 Revision I SC Typical test equi pment will consist of thermal neutron source equipment, a neutron detector and a counting instrument.

The test equipment is calibrated using a known standard, whose 108 content has been checked and verified by an independent method such as chemical analysis. This calibration process shall be repeated daily (every 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ) while tests are being performed.

8.1.7.4 Acceptance Criteria The neutron transmission test results shall be considered acceptable if the minimum 108 areal density is determined to be equal to, or greater than, that specified on the fuel tube drawings.

Any specimen not meeting the acceptance criteria shall be rejected and al I of the sheets from that batch shall be similarly rejected unless coupons from each individual absorber plate are tested and confirmed to meet or exceed the specified areal density.

8.1.8 eutron Absorber Tests for MPC-LACBWR Canistered Fuel Basket Neutron absorber material (commercially available as BORAL ), in the form of sheets consisting of boron-carbide evenly dispersed within a matrix of aluminum and clad with aluminum, is used in the NAC-MPC transportable storage canister fuel baskets. The manufacturing process consists of several step - the first being the mixing of the aluminum and boron-carbide powders that form the core of the fini shed material, with the amount of each powder a function of the desired 10B area l density.

The methods used to control the weight and to blend the powders were patented and proprietary processes of AA R and, subsequently, of Ceradyne Corporation of Chicoutimi (Quebec), Canada.

After manufacturing, test samples from each batch of BORAL neutron ab orber (poison) sheets shall be tested using wet chemistry or neutron ab orption techniques to verify the presence, proper distri bution, and minimum weight percent of 10B. The tests shall be perfo rmed in accordance with approved written procedures.

8.1.8. 1 eutron Absorber Material Sampling Plan The neutron absorber sampling plan is elected to demonstrate a 95/95 (95% probability and 95%

confi dence level) tatistical confidence level in the neutron absorber sheet material compliance with the specification. In addition to the specified sampling plan, each sheet of material is visually and dimensionally inspected using at least six measurements (along the edges near each corner and the longitudinal centerline) on each sheet. No rejected neutron absorber sheet is used. The sampling plan is supported by written and approved procedu res.

8. 1-20

NAC-STC SAR Docket No. 71-9235 April 2018 Revision I 8C The sampling plan requires that a coupon sample be taken from each sheet of the first set of 50 sheets of absorber material. Thereafter, coupon samples are taken from l O randomly selected sheets from each set of 50 sheets. This 1 in 5 sampling plan continues until there is a change in lot or batch of constituent materials of the sheet (i.e., boron carbide powder, aluminum powder, or aluminum extrusion), or a process change, at which time the sampling process is reinitiated as previously described. The sheet samples are indelibly marked and recorded for identification.

This identification is used to document neutron absorber test results, which become part of the quality record documentation package.

8.1.8.2 Wet Chemistry Test Performance An approved fac ility with chemical analysis capability shall be selected to perform the wet chemistry tests. The tests will ensure the presence of boron and enable the calculation of the 108 areal density.

Acceptability of the uniformity of boron distribution is based on the manufacturer's material qualification tests.

The most common method of verifying the acceptability of neutron absorber material is the wet chemistry method - a chemical analysis where the aluminum is separated from a sample with known thickness and volume. The remaining boron-carbide material is weighed and the area l density of 10B is computed. A statistical conclusion about the BORAL sheet fro m which the sample was taken and that batch of BORAL sheets may then be drawn based on the test resu Its and the established manufacturing processes previously noted.

8. 1.8.3 Neutron Absorption Test Performance An approved fac ility with a neutron source and neutron detection capability shall be selected to perform the described tests, if the neutron absorption test method is used. The tests will assure that the neutron absorption capacity of the material tested is equal to, or higher than, the given reference value and will verify the un iformity of boron distribution.

The principle of measurement of neutron absorption is that the presence of boron results in a reduction of neutron flux between the thermalized neutron source and the neutron detector-depending on the material thickness and boron content.

Typical test equipment will consist of thermal neutron source equipment, a neutron detector and a counting instrument. The test equipment is calibrated using standards whose 10B content has been checked and verified by an independent method such as chemical analysis. The highest permissible counting rate is determined from the neutron counting rates of the reference sheet(s),

8. 1-21

NAC-STC SAR Docket No. 71-9235 April 20 18 Revision I 8C which should be ground to the minimum allowable plate thickness. This calibration process shall be repeated daily (every 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ) while tests are being performed.

8.1.8.4 Acceptance Criteria The wet chemistry test results shall be considered acceptable if the JOB areal density is determined to be equal to, or greater than, that specified on the fuel tube drawings. The neutron absorption test shall be considered acceptable if the neutron count determined for each test specimen is less than or equal to the highest permissible neutron count rate determ ined from the BORAL standard, which is based on the JOB areal density specified on the fuel tube drawings.

Any specimen not meeting the acceptance criteria for either test method shall be considered to be nonconfo rming material and shall be evaluated within the NAC Jnternational QA Program.

Nonconfo rming material shall be assigned one of the following dispositions:

"use-as-is,"

"rework" or "reject." Only material that is determined to meet all applicable conditions of the license will be accepted.

8.1.9 Transportable Storage Canister The transportable storage canister is constructed of Type 304L (Yankee-MPC and CY-MPC) or 304/304L (MPC-LACBWR) stainless steel and is fabricated by welding.

If circumferential welds are required to join two shell sections, the seam welds shall not be aligned within 45° circumferentially. The welded cylinder is closed at the bottom by a circular plate welded to the shell wall. The top of the cylinder is closed by two field-installed circular plates, welded to the canister shell wa ll fo llowing fuel loading.

The transportable storage canister is a welded closed component. The canister serves as the confi nement boundary component of the NAC-MPC System during storage of spent fuel in the vertica l concrete cask.

The fi nished surfaces of all canister welds are visually examined in accordance with ASME Code Section V, Article 9, to verify that the components are assembled in accordance with the License Drawings and that the components are free of nicks, gouges, and other damage. The acceptance criteria fo r the visually examined welds for the Yankee-MPC and the CY-MPC canisters is in accordance with ASME Code Section VIII, Division I, UW-35 and UW-36 and Section Ill, Subsection NB, NB-4424 and NB-4427. The acceptance criteria for the visually examined welds of the MPC-LACBWR canister are in accordance with ASME Code, Section Ill, Subsection NF, NF-5360.

8. 1-22

AC-STC SAR Docket No. 71-9235 April 201 8 Revision I 8C The seam and girth welds in the transportable storage canister shell are full -penetration we lds that are radiographic (RT) examined in accordance with ASME Code Section V, Article 2. The acceptance criteria fo r the RT-examined weld is that specified in ASME Code Section Ill,

Subsection NB, Article B-5320. The canister shell to bottom plate weld is a full-penetration double-bevel weld with an inside fillet weld that is ultrasonic examined in accordance with ASME Code Section V, Article 5, with acceptance criteria as specified in ASME Code Section J11, Subsection NB, Article NB-5330. The final surfaces of the seam and girth welds in the canister and the canister shell to bottom plate weld are also liquid penetrant examined in accordance with AS ME Code Section V, Article 6, with the acceptance criteria being that specified in ASME Code Section 111, Subsection NB, Article NB-5350.

Field installed partial-penetration groove welds attach the shield and structural lids (Yankee-MPC and CY-MPC) or the closure lid (MPC-LACBWR) to the canister shell, and the vent and the drain port covers to the shield lid (Yankee-MPC and CY-MPC) or the inner and outer vent and drain port covers to the closure lid (MPC-LACBWR) after the canister is loaded. The closure ring for the MPC-LACBWR canister is welded to both the canister shell and closure lid by partial penetration welds. For the Yankee-MPC and CY-MPC canister, the root and final urfaces of the shield lid we ld are liquid penetrant examined. For the MPC-LACB WR can ister, the closure lid to canister shell weld is progressively liquid penetrant examined at the root, mid-plane and final urfaces. The structural lid to shell we ld for the Yankee-MPC and CY-MP canisters is progressively liquid penetrant examined at the root, every 3/8-inch weld layer and fi nal surface. Canister vent and drain port cover welds are liquid penetrant examined at the root and final surfaces unless the we lds are completed in a ingle pass. Welds completed in a single pass require only fin al urface liquid penetrant examination.

All liquid penetrant examinations are completed in accordance with A ME Code,Section V.

Article 6. Acceptance criteria for all liqu id penetrant examinations are a specified in ASME Code Section Ill, Division I Subsection NB, Article NB-5350.

The Yankee-MPC and CY-MPC canister shield lid welds are helium leakage tested in accordance with ASME Code Section V, Article I 0, Appendix V, using a minimum leak rate test sensiti vity of I x I 0-7 cm3/sec (helium). The MPC-LACBWR canister closure lid to canister shell we ld is hydrostatically tested fo llowing completion of the weld.

8.1-23

NAC-STC SAR Docket No. 7 1-9235 April 20 18 Revision I 8C The fabricator of the transportable storage canister will establish a written weld inspection plan in accordance with an approved quality assurance program. The weld inspection plan wi ll include visual, liquid penetrant, ultrasonic, and radiographic examination. In addition, the weld inspection plan wil l identify the welds to be examined, the sequence of the examinations, the type of examination method to be used, and the criteria for acceptance of the weld in accordance with the applicable sections of the ASM E Code.

8. 1.IO 1--1 L W Overpack and Basket The HL W Overpack is constructed of Type 304/304L stain less steel and is fa bricated by welding. If circumferential we lds are required to join two shell sections, the seam welds shall not be aligned within 45° circumferentially. The welded cylinder is closed at the bottom by a circular plate welded to the shell wall. The top of the cylinder is closed by a fie ld-installed circular plate, welded to the canister shell wa ll fo llowing 1--!L W canister loading.

The H L W Overpack is a welded closed component.

The fini shed surfaces of all HL W Overpack welds are visually examined in accordance with ASME Code Section V, Articles I and 9, to verify that the components are assembled in accordance with the License Drawings and that the components are free of nicks, gouges, and other damage. The acceptance criteria for the visually examined welds for the HL W overpack are in accordance with AS ME Code Section Vlll, Division 2, Section 7.5.2.2.

The seam, girth, and shell to bottom plate welds in the HLW overpack shell are ful l-penetration welds that are dye penetrant (PT) examined in accordance with ASME Code Section V, Articles I and 6. The acceptance criteria for the PT examined welds are those specified in ASME Code Section VII I, Division 2, Section 7.5.7.2.

Field installed partial-penetration groove welds attach the closure lid to the 1---IL W Overpack shell after HL W cani ter loading. The closure lid to canister shell weld is visually examined at the final surface. Visual examinations are completed in accordance with ASME Code,Section V, Artic les I and 9. Acceptance criteria for all visual examinations are as specified in ASM E Code Section YI 11, Division 2, Section 7.5.2.2.

The H L W Overpack basket is fa bricated from Type 304 stainless steel and is fabricated by welding. If circum fe rential welds are required to join two shell sections, the seam welds shall not be aligned within 45° circumferentially. The fi ve (5) welded l--l LW cy linder ce lls are closed

8. 1-24

NAC-STC SAR Docket No. 71-9235 April 2018 Revision I 8C at the bottom by a plate welded to the cell wall where accessible. The top of the HL W cylinder ce ll is open to allow vertical dry loading of a HLW canister.

The finished surfaces of all HLW overpack basket assembly welds are visually examined in accordance with A ME Code Section V, Articles I and 9 to verify that the components are assembled in accordance with the License Drawings and that the components are free of nicks, gouges, and other damage. The acceptance criteria for the visually examined welds for the HL W overpack basket are in accordance with A ME Code ection 111, ubsection NF, NF-5360.

Liquid penetrant (PT) examination will be performed on all HLW Overpack basket welds in accordance with A M Code,Section V, Articles I and 6. Acceptance criteria for the PT examined welds hall be in accordance with ASME Code, Section Ill, ubsection NF, NF-5350.

The fa bricator of the HLW Overpack and basket assemblies will e tablish a written weld inspection plan in accordance with an approved quality assurance program. The weld inspection plan will include vi ual and liquid penetrant examination. In addition, the weld inspection plan will identify the welds to be examined, the sequence of the examinations, the type f

examination method to be used, and the criteria for acceptance of the weld in accordance with the applicable sections of the ASME Code.

8.1-25

NAC-STC SAR Docket No. 7 1-9235 March 2017 Revision 18 Figure 8.1-1 Thermal Test Arrangement

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TEST SET-UP AND (a) EXTERNAL THERMOCOUPLE LOCATIONS

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DISK PLAN VIEW n:10 (b) INTERNAL CAVITY AND BASKET THERMOCOUPLE LOCATIONS 8.1-26

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