PLA-6370, License Renewal Application, Amendment to Section 4.2.2
| ML081710132 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 06/09/2008 |
| From: | Mckinney B Susquehanna |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| PLA-6370, TAC MD3309, TAC MD3310 | |
| Download: ML081710132 (11) | |
Text
Britt T. McKinney PPL Susquehanna, LLC Sr. Vice President & Chief Nuclear Officer 769 Salem Boulevard Berwick, PA 18603 4I f
Tel. 570.542.3149 Fax 570.542.1504 btmckinney@pplweb.com IPPI TM U. S. Nuclear Regulatory Commission Document Control Desk Mail Stop OP 1-17 Washington, DC 20555 SUSQUEHANNA STEAM ELECTRIC STATION UNITS 1 AND 2 LICENSE RENEWAL APPLICATION (LRA)
AMENDMENT TO SECTION 4.2.2 Docket Nos. 50-387 PLA-6370 and 50-388
References:
"Application for Renewed Operating License Numbers NPF-14 and NPF-22, dated September 13, 2006.
- 2)
Letter, R. Guzman (NRC) to B. T McKinney (PPL), "Request for Additional Information (RAI) - Susquehanna Steam Electric Station, Units 1 and 2 (SSES 1 and 2) - Extended Power Uprate Application Re: Vessels and Internals Technical Review (TAC Nos. MD3309 and MD3310),"
dated March 29, 2007.
- 3)
PLA-6186, B. T McKinney (PPL) to USNRC, "Proposed License Amendment Number No. 285for Unit ] Operating License No. NPF-14 and Proposed License Amendment No. 253 for Unit 2 Operating License No. NPF Extended Power Uprate Application - Re: Vessels and Internals Technical Review - Request for Additional Information Responses,"
dated April 26, 2007.
In accordance with the requirements of 10 CFR 50, 51, and 54, PPL requested the renewal of the operating licenses for the Susquehanna Steam Electric Station (SSES)
Units 1 and 2 in Reference 1.
As described in the enclosure, a revision was made to the PPL calculation that served as the basis for the reactor pressure vessel (RPV) upper shelf energy (USE) evaluation included in the SSES license renewal application (LRA). The calculation was revised in response to a request for additional information during the NRC review of the SSES extended power uprate (EPU) application. The revised calculation evaluates values for all of the RPV beltline plates and welds. The attached amendment for LRA Section 4.2.2 is provided to reflect the results of this revised evaluation and to ensure consistency with the information provided in Reference 3 for review of the EPU application. The conclusions in the LRA regarding upper shelf energy of RPV beltline material have not changed. All of the RPV beltline materials will remain in compliance with Appendix G of 10 CFR 50 for the period of extended operation.
A/-,) 9 Document Control Desk PLA-6370 There are no new regulatory commitments contained herein as a result of the attached amendment to the SSES LRA.
If you have any questions, please contact Mr. Duane L Filchner at (610) 774-7819.
I declare, under penalty of perjury, that the foregoing is true and correct.
Executed on: __
B cKinney
Enclosure:
Basis for LRA Changes
Attachment:
SSES LRA Amendment (Section 4.2.2)
Copy: NRC Region I Ms. E. H. Gettys, NRC Project Manager, License Renewal, Safety Mr. R. Janati, DEP/BRP Mr. F. W. Jaxheimer, NRC Sr. Resident Inspector Mr. A. L. Stuyvenberg, NRC Project Manager, License Renewal, Environmental Mr. B. K. Vaidya, NRC Project Manager
Enclosure to PLA-6370 Basis for LRA Changes
P t Enclosure to PLA-6370 Page 1 of 1 The Upper Shelf Energy (USE) Evaluation originally presented in the License Renewal Application (LRA), Section 4.2.2 addressed only the limiting beltline plates and welds for SSES Units 1 and 2, as identified in the SSES FSAR Section 5.3.1.5.1.5. The evaluation consisted of completing the BWRVIP-74-A Equivalent Margin Analysis (EMA) Plant Applicability Verification Forms to demonstrate that the limiting beltline plates and welds are bounded by the EMA for 54 Effective Full Power Years (EFPY).
The evaluation was documented in a PPL calculation prepared in December of 2005 to support the submittal of the LRA in September of 2006.
In March of 2007, during the review of the Extended Power Uprate Application for SSES, the NRC requested PPL to provide a table of information that demonstrated how the end-of-license USE values were calculated for all beltline materials (Reference 2). In response to the NRC's request, the December 2005 calculation was revised in April 2007 to document the evaluation of the USE values for all beltline plates and welds, not just the limiting plates and welds. The results of the revised calculation were provided to the NRC in Reference 3.
The current revision of the calculation (April 2007) documents how the changes in USE were projected for 54 EFPY in accordance with Regulatory Guide (RG) 1.99, Revision 2.
For the plates and welds with projected USE values of 50 ft-lb or greater at 54 EFPY, the criterion of 10 CFR 50, Appendix G, was met and no further evaluation was required.
For plates and welds that do not meet the 50 ft-lb criterion, the BWRVIP-74-A EMA was employed to demonstrate that the 54 EFPY USE values remain in compliance with 10 CFR 50, Appendix G.
Due to the broader scope (all beltline materials vs. only the limiting materials) and the different methodology employed (RG 1.99, Rev. 2, vs. only BWRVIP-74-A EMA), the results of the revised calculation do not directly match the information originally provided in the LRA. As such, the LRA is revised to present the latest information in the format that is supported by the controlling calculation revision.
Attachment to PLA-6370 SSES LRA Amendment (Section 4.2.2)
Attachment to PLA-6370 Page 1 of 6 4.2.2 Upper Shelf Energy Evaluation
> The following text under Section 4.2.2 (on LRA page 4.2-4) is revised by addition (bold italics) and deletion (s,,kethmugh).
10 CFR 50, Appendix G requires that Upper Shelf Energy (USE) values for RPV materials include the effects of neutron radiation. It states that USE for the beltline materials including plates and welds be maintained at no less than 50 ft-lb for the life of the reactor vessel.
Calculated fluence values for EPU and extended operation to 54 EFPY exceed previously determined fluence based on materials surveillance program information for Units 1 and 2.
Therefore, projections of changes in USE for the period of extended operation are required in accordance with 10 CFR 50, Appendix G.
RBIARVIP 71 A (Roference 4.8.2) docui-menAts anR equivalent mnargin analysis Which establishes We* mlInlm[l
'im E
v lU=
W l[1lM
+Fr eVwv E
0 D'U eU lftilne Materials [r9Un[l U
ir r nnmnlMPi naRG8 w.ith 10 C2F=R 50, Append~ix G..-
The equivalent margin analyi asms that the percent decreases in USE preScr;bed by Regulatory Guide,RG) 1.99 (Reference 4.8.3) ae app.ropriat for a giVen vessel's beltline materials. The SSES-Unit1ad-Unit 2 vessel beitline m~aterials are bouRded by the eq*iValent *a-rgin a*naysis.
Limiting vessel beltline plates and welds were evaluated using data from survellance capsule Fepeots and 54 EFPY flulence Values. Using this inRformationR the predicted decrease in USE was obtained from RG 1.99, F~igure 2 and compared to the decreases assumed in the equivalent m~argin analysis. The evalua6tionso utilized the equivalent maFrgi aRalysis plant applicability verifcatin forms from*
TWARVIP 74 A. The co)mpleted forms are presented in Table 4.2 -3, Table 1.2-4, Table 4.2 5, and T-able4.26-6 7
The projections of changes in USE for the period of extended operation for the RPV beltline plates and welds for Units 1 and 2 were determined in accordance with Regulatory Guide (RG) 1.99, Revision 2 (Reference 4.8.3) and are presented in Table 4.2-3 and Table 4.2-5, respectively. For the plates and welds with projected USE values of 50 ft-lb or greater at 54 EFPY, the criterion of 10 CFR 50, Appendix G, has been met and no further evaluation is required.
For plates and welds that do not meet the 50 ft-lb criterion, BWRVIP-74-A (Reference 4.8.2) documents equivalent margin analyses (EMA) to demonstrate that the 54 EFPY USE values for BWR/2-6 vessel beltline materials remain in compliance with 10 CFR 50, Appendix G. To credit the BWRVIP-74-A EMA, the applicability of the EMA needs to be verified for the vessel beltline materials. This is accomplished, as prescribed in BWRVIP-74-A, by comparing the predicted decrease in USE from RG 1.99, Figure 2, to the decrease assumed in the EMA for each vessel beltline plate and weld that fails to meet the 50 ft-lb criterion. Table 4.2-4 and Table 4.2-6 present the BWRVIP-74-A EMA applicability verifications for the SSES plates and welds having a projected USE value of less than 50 ft-lb for Units I and 2, respectively. The results demonstrate that all evaluated plates and welds are bounded by the BWRVIP-74-A equivalent margin analyses.
Therefore, the effects of neutron radiation have been evaluated, and all RPV beltline materials for Units 1 and 2 have been demonstrated to remain in compliance with Appendix G of 10 CFR 50 for the period of extended operation.
Attachment to PLA-6370 Page 2 of 6 Table 4.2-3 under Section 4.2.2 (on LRA page 4.2-5) is replaced with the following:
Table 4.2-3 Unit 1 RPV Beltline USE Assessment for 54 EFPY Unirr. CUSE 1/4t Fluence
% Drop in CVUSE @ 1/4t("
Requires Part Name ID Heat Lot
%Cu (ft-lbs)
(1019 n/cm 2)
CvUSE (ft-lbs)
EMA?(2)
Lower Shell #1 21-1 B5083-1 0.14 48.1 (4) 0.0808 12.8 41.9 YES Lower Shell #2 21-2 C0770-2 0.14 68.9 (4) 0.0808 12.8 60.1 NO (3)
Lower Shell #3 21-3 C0814-2 0.13 78.0 (4) 0.0808 12.2-68.5 NO Lower-Int. Shell #1 22-1 C0803-1 0.09 52.7 (4) 0.0974 10.9 47.0 YES Lower-Int. Shell #2 22-2 C0776-1 0.12 36.4 (4) 0.0974 12.2 32.0 YES Lower-Int. Shell #3 22-3 C2433-1 0.10 87.8 0.0974 10.9 78.2 NO Weld #1 629616 L320A27AG 0.04 114.0 0.0808 10.5 102.0 NO Weld #2 411L3071 L311A27AF 0.03 109.0 0.0808 10.5 97.6 NO Weld #3 494K2351 L307A27AD 0.04 192.0 0.0808 10.5 171.8 NO Weld #4 401S0371 B504B27AE 0.03 127.0 0.0808 10.5 113.7 NO Weld #5 402K9171-K315A27AE 0.03 109.0 0.0808 10.5 97.6 NO Weld #6 402C4371 C115A27A 0.02 92.0 (4) 0.0808 10.5 82i-3 NO Weld #7 412P3611 J417B27AF 0.03 140.0 0.0808 10.5 125.3 NO Notes: 1. CvUSE at 1/4t computed as (Unirr. CvUSE)(100 - % Drop in CvUSE), in accordance with Regulatory Guide 1.99, Rev. 2.
- 2.
If CvUSE < 50 ft-lbs, then "YES", and assessment for this material will be performed in accordance with BWRVIP-74-A.
- 3.
Although EMA is not required for this plate (since CvUSE > 50 ft-lbs), this plate is identified for EMA in RVID2. Therefore, EMA is conservatively performed.
- 4.
Value is conservatively based on 10°F data. Refer to SSES FSAR Section 5.3.1.5.1.2.
Attachment to PLA-6370 Page 3 of 6 Table 4.2-4 under Section 4.2.2 (on LRA page 4.2-6) is replaced with the following:
Table 4.2-4 Unit 1 RPV Beltline USE Equivalent Margin Analyses for 54 EFPY SSES-1 Plates SSES-1 Plate SSES-1 Plate BWRVIP-74-A Applicability Verification B5083-1 and C0803-1 C0776-1 C0770-2 Surveillance Plate USE:
%Cu 0.09 0.09 0.09 Capsule Fluence 0.14xl 0 1 8n/cm2 0.14xl 018n/cm2 0.14xl 018n/cm 2 Measured % Decrease (Charpy Curves)
-2 (increase)
-2 (increase)
-2 (increase)
RG1.99 Predicted % Decrease (RG1.99, Figure 2) 6 6
6 Lower Beltline Plate USE:
%Cu 0.14 0.09 0.12 54 EFPY Peak ID Fluence 1.17x1018 n/cm2 1.41x1018 n/cm2 1.41x1018 n/cm2 54 EFPY 1/4t Fluence 0.808xl 018 n/cm2 0.974x 018 n/cm2 0.974x 018 n/cm2 RG1.99 Predicted % Decrease 12.8 10.9 12.2 Adjusted % Decrease (RG1.99, Position 2.2)
N/A N/A N/A Criteria for Plates
% Decrease < 23.5%
12.85 23.5 (1) 10.9 < 23.5 (1) 12.25 23.5 (1)
Note 1. The SSES material is bounded by the BWRVIP-74-A equivalent margin analysis.
Attachment to PLA-6370 Page 4 of 6 Table 4.2-5 under Section 4.2.2 (on LRA page 4.2-7) is replaced with the following:
Tabie 4.2-5 Unit 2 RPV Beltline USE Assessment for 54 EFPY Unirr. CUSE 1/4t Fluence
% Drop in CRUSE @ 1/4t(')
Requires Part Name ID Heat Lot
%Cu (ft-lbs)
(1019 n/cm 2)
CvUSE (ft-lbs)
EMA?(2)
Lower Shell #1 21-1 6C956-1-1 0.11 125.1 (3) 0.0815 11.1 111.2 NO Lower Shell #2' 21-2 6C980-1 -1 0.10 93.9 (3) 0.0815 10.5 84.0 NO Lower Shell #3 21-3 6C1053-1-1 0.10 76.1 3
0.0815 10.5 68.1 NO Lower-Int. Shell #1 22-1 C2421-3 0.13 52.0 (3) 0.0981 12.8 45.3 YES Lower-Int. Shell #2 22-2 C2929-1 0.13 83.9 0.0981 12.8 73.2 NO Lower-Int. Shell#3 22-3 C2433-2 0.10 48.1 (3) 0.0981 11.0 42.8 YES Weld #1 629616 L320A27AG 0.04 114.0 0.0815 10.5 102.0 NO Weld #2 624263 E204A27A 0.06 73.0 (3) 0.0815 11.2 64.8 NO Weld #3 09M057 C109A27A 0.03 44.0 (3) 0.0815 10.5 39.4 YES Weld #4 659N315 F414B27AF 0.04 137.0 0.0815 10.5 122.6 NO Weld #5 411L3071 L311A27AF 0.03 125.0 0.0815 10.5 111.9 NO Weld #6 494K2351 L307A27AD 0.04 192.0 0.0815 10.5 171.8 NO Weld #7 401S0371 B504B27AE 0.03 125.0 0.0815 10.5 111,..9 NO Weld #8 402K9171 K315A27AE 0.03 134.0 0.0815 10.5 119.9 NO Weld #9 402C4371 C115A27A 0.02 92.0 (3) 0.0815 10.5 82.3 NO Weld #10 412P3611 J417B27AF 0.03 140.0 0.0815 10.5 125.3 NO Notes: 1. CRUSE at 1/4t computed as (Unirr. CvUSE)(1 00 - % Drop in CvUSE), in accordance with Regulatory Guide 1.99, Rev. 2.
- 2.
If CvUSE < 50 ft-lbs, then "YES", and assessment for this material will be performed in accordance with BWRVIP-74-A.
- 3.
Value is conservatively based on 10°F or 40 °F data. Refer to SSES FSAR Section 5.3.1.5.1.2.
Attachment to PLA-6370 Page 5 of 6 Table 4.2-6 under Section 4.2.2 (on LRA page 4.2-8) is replaced with the following:
Table 4.2-6 Unit 2 RPV Beltline USE Equivalent Margin Analyses for 54 EFPY BWVP-4A pliaiit erfcainSSES-2 Plate SSES-2 Plate SSES-2 Weld BWRVIP-74-A Applicability Verification C2421-3 C2433-2 09M057 Surveillance Plate/Weld USE:
%Cu 0.12 0.12 0.02 Capsule Fluence 0.13xl0 18 n/cm 2 0.13x10 18n/cm2 0.13xl0 1
2 n/cm2 Measured % Decrease (Charpy Curves)
-4 (increase)
-4 (increase) 4 RG1.99 Predicted % Decrease (RG1.99, Figure 2) 8 8
5 to 6 Lower Beltline Plate/Weld USE:
%Cu 0.13 0.10 0.03 54 EFPY Peak ID Fluence 1.42x101 8n/cm2 1.42x10 18n/cm 2 1.18x101 8n/cm 2 54 EFPY 1/4t Fluence 0.981x1018n/cm 2 0.981x1018 n/cm2 0.815x10 8n/cm2 RG1.99 Predicted % Decrease 12.8 11.0 10.5 Adjusted % Decrease (RG1.99, Position 2.2)
N/A N/A N/A Criteria for Plates
% Decrease *23.5%
12.8 < 23.5 (1) 11.0: <23.5 (1)
N/A Criteria for Welds
% Decrease* 39%
N/A N/A 10.5* 39 (1)
Note 1. The SSES material is bounded by the BWRVIP-74-A equivalent margin analysis.
Attachment to PLA-6370 Page 6 of 6
> The following text under Section 4.2.2 (on LRA page 4.2-8) is revised by deletion Fo*r the vessel boitlie plates, the maxim.--i docrlFeasl IS Ea6in Ufoud te be 10.9*
% for Unit 1 and 13.8% fo.r Unr i2. This is less than the assumed decrease off 2250 in the equiv magi;aalysis. Thercforc, the maximum..
pred-aicted decr~eases in USE for 54 EFPY for the beltlinc plates forF both units arc boun~ded by the g9eneic qiaetmri analysis documented inR BWVRVIP 74 A, and the projected-US2-E for the veslbolBtlne plates is acceptable for the period of extended operation.
FoAr the welds assocGiated with the vessel beltline platces, the maxihmWR decrease in US9E was found to be 10.41% for Unit 1 and 19.8-% forF Unit 2. This is less than the assumed decrease ot 395% in the equivalent margin analysis. Therefore, the maximum predicted decreases in USE for the w~elds in the veslbeltlfine-region are boun~dcd by the BWIA.RVIP 71 A equivalent m~argin analysis, and the projected USE forF the welds is acceptable for the pcriod of extcned GperatGR.