ML21111A020

TVA Slides for April 21, 2021 Public Meeting to Discuss Planned Sequoyah Amendment Request

ML21111A020
Person / Time
Site:	Sequoyah
Issue date:	04/21/2021
From:	Tennessee Valley Authority
To:	Division of Operating Reactor Licensing
References
EPID L-2021-LRM-0041
Download: ML21111A020 (12)

Text

License Amendment Request Revise Technical Specifications to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times -

RITSTF Initiative 4b April 21, 2021

Agenda

• Describe future license amendment request (LAR)

Scope of the Request Variations from TSTF-505 PRA Models and CRMP Summary

• LAR Schedule

• Summary

• Questions/Comments?

2

Scope of the Request

• LAR is based on TSTF-505, Revision 2, and NEI 06-09, Risk-Informed Technical Specifications Initiative 4b, Risk-Managed Technical Specifications (RMTS)

Guidelines

• RICTs apply to 20 SQN LCOs

- Applicable in Modes 1 and 2

- No loss of function consistent with template

• New TS 5.5 program called the Risk Informed Completion Time Program

• LAR informed by approved precedent and those currently under review 3

Variations Several types of administrative variations are taken Required Actions (RAs) with different numbering and slightly different wording with same intent TSTF-505 RAs that SQN TS does not have Instrumentation RAs invoked for different Functions RICTs not applied since Additional Justifications werent met (e.g., not having a Shutdown PRA)

Miscellaneous site-specific formatting changes 4

Variations (continued)

Five technical variations are being taken SQN Instrumentation RAs that are not in STS meet the criteria for applying a RICT Instrumentation RA revised for consistency with STS Site-specific ERCW System RA that is not in STS which meet the criteria for applying a RICT Site-specific Offsite Power RA that is not in STS which meet the criteria for applying a RICT Site-specific Electrical Distribution RA that is not in STS which meet the criteria for applying a RICT 5

PRA Technical Acceptability Internal Events including Internal Flooding Peer Reviewed Using NEI 05-04 Process Against ASME/ANS RA-Sa-2009 (Parts 2 and 3) with RG 1.200 Rev 2 Exceptions Finding Closure Review Performed Using Appendix X Process No Open Internal Events/Internal Flooding Finding Level F&Os Fire Peer Reviewed Using NEI 07-12 Process Against ASME/ANS RA-Sa-2009 (Part 4) with RG 1.200 Rev 2 Exceptions Finding Closure Review Performed Using Appendix X Process No Open Fire PRA Finding Level F&Os 6

PRA Technical Acceptability (continued)

Seismic Peer Reviewed Using NEI 12-13 Process Against ASME/ANS RA-Sb-2013 (Part 5) with applicable RG 1.200 Rev 2 Exceptions Finding Closure Review Performed Using Appendix X Process No Open Seismic PRA Finding Level F&Os Other External Hazards All Other External Hazards Screened Out in accordance with ASME/ANS RA-Sa-2009 (Part 6) 7

RICT Program Real-Time Model A Real-Time Risk Model similar to existing Maintenance Rule a(4) Configuration Risk Management Program Incorporates Internal Events, Internal Flooding, Fire and Seismic into a One-Top Multi-Hazard Model Uses EPRI Phoenix Risk Analysis Software Incorporates RICT Calculation Based on CDF and LERF for Unit 1 and Unit 2 8

Schedule

• Projected submittal in mid-May 2021 with a requested approval within one year

• A 180-day implementation period is proposed 9

Summary

• TSTF-505 LAR is scheduled to be submitted in mid-May 2021 with approval requested in one year

• LAR is consistent with TSTF-505 Model Application

• RICT process will follow NEI 06-09-A

• PRA is technically acceptable for the RICT Application 10

Questions/

Comments

???

11