ML20086M250
| ML20086M250 | |
| Person / Time | |
|---|---|
| Site: | 07109377 |
| Issue date: | 03/27/2020 |
| From: | Pierre Saverot Storage and Transportation Licensing Branch |
| To: | Christopher Regan Division of Fuel Management |
| Saverot P | |
| Shared Package | |
| ML20086M199 | List: |
| References | |
| EPID L-2019-LRM-0029 | |
| Download: ML20086M250 (4) | |
Text
March 27, 2020 MEMORANDUM TO:
Christopher Regan, Deputy Director Division of Fuel Management, NMSS FROM:
Pierre Saverot, Project Manager /RA/
Storage and Transportation Licensing Branch Division of Fuel Management, NMSS
SUBJECT:
SUMMARY
OF MARCH 24, 2020 MEETING WITH TN AMERICAS LLC
=
Background===
On December 13, 2016, and July 30, 2019, Category 1 public meetings were held at the U.S.
Nuclear Regulatory Commission (NRC) headquarters in Rockville, MD, between the NRC staff and representatives from TN Americas LLC, Orano Federal Services, DOMINION ENERGY, and EPRI to discuss the licensing of the TN-32B HBU cask selected to support the DOE/EPRI high burnup cask research and development project. This third pre-application meeting, noticed on March 2, 2020 (ADAMS Accession No. ML20062D541), was held by teleconference.
The meeting attendance list and the presentation are provided as Enclosure Nos. 1 and 2, respectively.
Discussion The TN-32B HBU cask has been loaded with 32 PWR high burn up spent fuel assemblies, with four different cladding types, and placed in storage in November 2017 under certificate of compliance (CoC) No. 72-1021. Fuel assembly temperatures are monitored by thermocouples installed through the closure lid.
There are unique conditions specific to this demonstration cask, including the effect of thermocouple lance assemblies on the structural, thermal, and shielding evaluations, the criticality evaluation with new, i.e., not burned, poison rod assemblies, etc., but the meeting discussions focused on the changes made by the applicant since the July 30, 2019, meeting.
TN will no longer design an impact limiter with foam for the TN-32B package because of the concerns raised by staff, in July 2019, on both the applicability of the benchmarking from a quasi-static model to a 1/3 scale model, and the characterization and demonstration required for the foam behavior in the hypothetical accident condition (HAC) fire test. TN will switch back to the redwood-balsa wood design of the TN-40 and TN-68 impact limiters.
CONTACT: Pierre M. Saverot, NMSS/DFM 301-415-7505
C. Regan 2
Also, following discussions with stakeholders (DOE, EPRI, National Laboratories), TN agreed with staffs suggestion to bridge the knowledge gap between temperature data before and after shipments, which results in the need to maintain thermocouples intact for transport. The fact that the thermocouple cables/OP tubing are no longer severed and thus are now part of the containment boundary results in design changes that were detailed and explained during the meeting.
Staff commented on the changes made, as follows:
The application shall include data on balsa and redwood moisture content, density, crush strength, and lock up deformation. The drawing details of the spacer support bars should be clarified (slide 12 of the presentation is confusing), including their attachment to the puncture plate or lid plate; regarding the bolt layout (the hidden line work should be shown on the drawing) and all dimensions, along with tolerances, shall be put on the licensing drawings.
Staff said that it was unclear how the structural integrity of the OP tubing at the tube-to-penetration plug(s) interface is to be maintained during the cask 30-ft side drop event. A "rigid" thin OP tubing can be particularly susceptible to bending stress challenges, if left overhanging and supported only at the interface location. Staff noted that the application should include a stress analysis for the interface design.
The application shall clarify the components that are part of each of the primary, secondary, and tertiary containment boundaries: the locations of the metallic and elastomeric seals, as well as of the containment boundaries, shall be clearly marked. The application shall include a table showing when those components were or will be tested to ANSI N14.5 (2014) for fabrication, pre-shipment, maintenance, and periodic tests.
Staff agreed that NUREG 1536, Section 5.4.4, states that the confinement analysis is unnecessary in the application if the package is tested to be leaktight. Staff asked the applicant to clarify if Helium is present in the 2nd containment boundary.
Staff requested that the application includes the temperature history (temperature curve for the cavity and for the metallic seals) during the HAC regulatory fire and post-fire cool down. Even if the elastomeric seals are not the containment seals, staff will look at their temperature curves in HAC fire event. The applicant mentioned that the decay heat of the package will be 23.52 kW at the time of shipment.
The TN-32B HBU cask demonstration project is a unique case. All calculations and chapters of the application should be completed within the next 6 months and TN Americas, LLC, will be submitting, in the early 4th quarter of this year, an application for a Part 71 CoC to support a one-time shipment of this TN-32B HBU cask in the 2027 timeframe Staff made no regulatory commitment during the meeting.
Docket No. 71-9377 EPID L-2019-LRM-0029
Enclosures:
1-Meeting Attendees 2-Presentation
C. Regan 3
SUBJECT:
SUMMARY
OF MARCH 24, 2020 MEETING WITH TN AMERICAS LLC DATE: March 27, 2020 DISTRIBUTION: DFM r/f, A. Kock ADimitriadis, RI BDesai, RII MKunowski, RIII GWarnick, RIV G:\\SFST\\Saverot\\71-9377 TN-32\\meeting summary March2020.doc; NRC HBU Meeting March 2020 final.pdf ADAMS No.: ML20086M199 OFC DFM E
DFM C
DFM NAME PSaverot SFigueroa JMcKirgan DATE 03/25/2020 03/25/2020 03/27/2020 OFFICIAL RECORD COPY
Meeting Between TN Americas LLC and the Nuclear Regulatory Commission March 24, 2020 Meeting Attendees NRC/NMSS/DFM Pierre Saverot Antonio Rigato JoAnn Ireland Chris Bajwa Jimmy Chang David Tang EPRI Keith Waldrop Orano Federal Services Gary Clark John McEntire Dominion Energy David Tomlinson DOE Ned Larson