ML23025A411
| ML23025A411 | |
| Person / Time | |
|---|---|
| Issue date: | 06/27/2023 |
| From: | David Williams NRC/NRR/DANU/UAL1 |
| To: | Proffitt J NRC/NRR/DANU/UAL1 |
| Williams D | |
| References | |
| RG-1.247 | |
| Download: ML23025A411 (5) | |
Text
MEMORANDUM TO:
Joseph A. Proffitt, Acting Chief Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:
Donna M. Williams, Senior Project Manager Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF THE NOVEMBER 8, 2022, PUBLIC MEETING BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND MULTIPLE STAKEHOLDERS TO DISCUSS PUBLIC COMMENTS ON THE TRIAL REGULATORY GUIDE 1.247, ACCEPTABILITY OF PROBABILISTIC RISK ASSESSMENT RESULTS FOR NON-LIGHT WATER REACTOR RISK-INFORMED ACTIVITIES On November 8, 2022, the U.S. Nuclear Regulatory Commission (NRC) held a public meeting with stakeholders. The announcement for this public meeting is available in the Agencywide Document and Access and Management System (ADAMS) under accession number ML22298A213. The subject of this meeting was to discuss the NRC staffs review and endorsement of the American Society of Mechanical Engineers/American Nuclear Society (ASME/ANS) advanced non-light-water reactor (NLWR) consensus probabilistic risk assessment standard designated as ASME/ANS RA-S-1.4-2021, Probabilistic Risk Assessment Standard for Advanced Non-Light Water Reactor Nuclear Power Plants. The enclosure to this document lists the meeting attendees. The NRC staffs presentation slides are available in ADAMS (ML22318A284).
The purpose of this meeting was to discuss comments received on trial Regulatory Guide 1.247 Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities (ML21235A008) and next steps in finalizing the RG with the nuclear industry and other stakeholders. The comments were addressed in a Federal Register notice dated October 17, 2022 (87 FR 62894).
CONTACT: Donna Williams, NRR/DANU (301) 415-1322 June 21, 2023 Signed by Williams, Donna on 06/21/23
J. Proffitt In its remarks, the NRC staff provided background on the development of trial RG 1.247 and noted that comments were received from the Nuclear Energy Institute and X-Energy, LLC. No changes were made to the trial RG as a result of the comments. The NRC staff provided a brief discussion of the comments received. The NRC staff considers the comments related to errors of commission (comments on requirements HLR-HR-E and HR-E4) significant. Therefore, these comments were discussed in detail, as described below.
Regulatory Guide 1.247 takes exceptions to the ASME and ANS NLWR PRA standard regarding the treatment of errors of commission (EOCs) in a PRA. The exceptions provide for the consideration of EOCs that result in adverse safety impacts for Capability Category I, (CC-I).
The comments indicate that these exceptions are not consistent with the current PRA state of practice, and broadly considering EOCs goes above and beyond the requirement for the current operating fleet. The NRC staff is keeping the exceptions related to EOCs, in this trial use RG.
Because there is limited operating experience regarding EOCs for NLWRs and the scope of the ASME/ANS NLWR PRA standard is broader than the scope of the ASME/ANS Level 1/LERF LWR PRA standard, EOCs may play a more important role in the NLWR PRA than for the LWR PRA and, therefore, NLWR PRA developers will need to address that EOCs are not an issue before eliminating them from consideration.
The trial period for this RG is expected to last for approximately 2 years to allow time to incorporate any changes related to a revision of ASME/ANS RA-S-1.4-2021. The NRC staff will also incorporate changes or comments that arise from the trial use. The NRC staff will consider other comments received during the trial use period in preparing a final draft of RG 1.247 and will consider the experience obtained through the trial use of the RG.
Enclosure:
As stated
ML23025A411 NRR-106 OFFICE NRR/DANU/UAL1/PM NRR/DANU/UAL2/LA NRR/DANU/UAL1/BC NRR/DANU/UAL1/PM NAME DWilliams CSmith JProffitt DWilliams DATE 1/27/2023 5/30/2023 6/7/2023 6/21/2023
Enclosure List of Attendees Public Meeting Between the U.S. Nuclear Regulatory Commission and Multiple Stakeholders to Discuss Public Comments on the Trial Regulatory Guide 1.247 November 8, 2022 Name Organization Michelle Gonzales U.S. Nuclear Regulatory Commission (NRC)
Harriet Karagiannis NRC Hanh Phan NRC Anders Gilbertson NRC Matthew Humberstone NRC Donna Williams NRC Shilp Vasavada NRC Mehdi Reisi Fard NRC JS Hyslop NRC John Grasso NRC William Reckley NRC Madhumita Sircar NRC Jing Xing NRC Bridget Curran NRC David Holcomb NRC Jeffery Wood NRC James Chang NRC De Wu NRC Scott Bussey NRC Weijun Wang NRC Susan Cooper NRC Ian Jung NRC Christopher Tyree NRC Emma Redfoot Oklo, Inc.
Victoria Andersen NEI Raymond Burski ARC Clean Technology Schichlein, Lisa GE Power Portfolio Edwin Lyman Connie Kline Ingrid Nordby X-energy Name Organization Alaina Vivanco X-energy Ben Chen Matt Hendrickson Yolanda Combrink Robert Fortner Ethan Graven Harry Liao X-Energy Dave Grabaskas Pearle Lipinski Andrea Maioli Stephen Hess Matthew Degonish Donald H.Behnke Emma Redfoot Timothy Enfinger GE Power Portfolio Eric Thornsbury Sarah Fields Randy Belles Farshid Shahrokhi Framatome Mihai Aurelian Diaconeasa Mark Cursey X-energy Brian Johnson -
TerraPower Elliott Korb Frank Schaaf Siavash Dorvash Drew Peebles Kairos Power