ML22129A175
| ML22129A175 | |
| Person / Time | |
|---|---|
| Issue date: | 05/10/2022 |
| From: | Edgardo Torres NRC/NRR/DRA/APOB |
| To: | Antonios Zoulis NRC/NRR/DRA/APOB |
| Torres E | |
| References | |
| Download: ML22129A175 (6) | |
Text
May 10, 2022 MEMORANDUM TO: Antonios Zoulis, Chief PRA Oversight Branch Division of Risk Assessment Office of Nuclear Reactor Regulation Signed by Torres, Edgardo on 05/10/22 FROM: Edgardo Torres, Reliability and Risk Analyst PRA Oversight Branch Division of Risk Assessment Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF APRIL 5, 2022, PUBLIC MEETING TITTLED SECOND PRA CONFIGURATION CONTROL WORKSHOP BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND INDUSTRY STAKEHOLDERS On April 5, 2022, the U.S. Nuclear Regulatory Commission (NRC) staff held a public meeting between the NRC, industry stakeholders, and other interested parties. The Comment -
Gathering type meeting was conducted virtually. The meeting notice is available in the Agencywide Documents Access and Management System (ADAMS), at Accession Number ML22069B081. The NRC presentation used to facilitate the discussion during the meeting is available in ADAMS at Accession Number ML22094A198. The list of meeting participants is provided as an enclosure to this document. The staff received no public meeting feedback forms related to this meeting.
During the meeting the staff updated industry and other interested parties on the efforts to develop an oversight footprint in PRA Configuration Controls. The staff discussed the details of the information gathering and guidance development effort (tabletops), as the process the staff will use to inform recommendations; the staff sought feedback to inform the information request to execute the tabletops; and answered questions and concerns from industry representatives.
Details on the topic, comments and feedback received are described on the following pages.
The meeting was approximately 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> in length.
Enclosures:
List of Meeting Attendees CONTACT: Edgardo Torres, NRR/DRA 301-415-0705
A. Zoulis February Public Workshop Take-Aways The NRC provided answers to two questions from the February 2nd PRA Configuration Control Workshop that were unaddressed.
No questions, comments or feedback were received during this part of the workshop.
Information Gathering and Guidance Development Update The NRC staff discussed the information it deemed necessary to support the tabletops at licensed facilities. The staff indicated that information request will be from with existing, readily available information. The information request includes the following:
Procedures for implementation of the PRA Configuration Control program Procedures for change control of inputs to the PRA Configuration Control program PRA Notebooks - Staff to identify PRA-specific documentation based upon targeted review of licensee applied risk-informed applications and scope of PRA changes Licensed operator lesson plans for top 10 risk-significant systems based on risk achievement worth (RAW) and Fussel-Vesely (FV) for each approved hazard group model Copies of the last two PRA model-of-record (MOR) updates CDF awareness summaries to site management or an initiating event percent distribution chart List of components and operator actions basic events for CDF and LERF based on RAW and FV from the current and prior MOR update. Provide similar information for additional approved hazard group models. Include the below importance measures.
List of top 20 baseline dominant sequences and associated top 50 cut sets from current and prior MOR. Provide similar information for additional approved hazard group models.
Basic events nomenclature information to understand association to components/human events used in PRA List of PRA Configuration Control updates (maintenance/upgrade) evaluations or model change log/tracking changes software, from the prior through current MOR update period for all approved hazard group models Pending changes from model change logs/tracking change software to the current MOR and additional approved hazard group models.
List of high priority (i.e., I, II, III) condition reports (CRs) or action request (AR) from the prior through current MOR update.
List of changes from the following areas from the prior through current MOR update:
o Design/Engineering changes (Fully/Partially Installed) o EOP, AOP, SOP changes o Tracking and control of systems, structure and components (SSCs) unavailability hours data for top 50 risk-significant components, based on FV and RAW, per approved hazard group o Tracking and control of SSC reliability data for 50 risk-significant components, based on FV and RAW, per approved hazard group o Plant and industry operating experience from the prior through current MOR update
A. Zoulis Industry representatives noted that providing previous model information would be difficult to obtain, specifically, for fire internal hazard model because of changes implemented to computer codes. One alternative presented by industry was to review quantification notebooks from the previous version and the current version to fulfil the intent of the information request, which would include most risk-significant systems. Additional feedback provided by industry was related to explaining the sampling strategy as it relates to the PRA Configuration Control process; maintaining focus on significant changes; inputs driving current PRA hazard groups changes; challenges with associating supporting requirements to inputs not incorporated as a maintenance or upgrade; and the number of records reviewed as part of PRA Configuration Control program.
The NRC staff conveyed its plans to take the industry feedback into consideration as the staff continues to work with industry to achieve a balanced approach in providing oversight to ensure PRA Configuration Control.
Closing Remarks The public was given an opportunity to provide additional comments or questions, and no one chose to do so. NEI representative stated that industry will document the most valuable items for the NRC to look at from their perspective to complete the tabletops. The NRC DRA Deputy Division Director then thanked the participants for the discussion and conveyed that additional outreach efforts would continue as we proceed with this initiative. The meeting was then adjourned.
ML22129A175 NRC-001 OFFICE NRR/DRA/APOB NRR/DRA/APOB NAME ETorres AZoulis DATE 5/10/2022 5/12/2022 LIST OF MEETING ATTENDEES Attendee Affiliation Torres, Edgardo NRC Pressley, Lundy NRC Thomas, Andrew NRC Caponi, Louis NRC Raleigh, Deann Clint Alday (Guest)
Burgess, Nick Jacobson, Ronald G.
Dolan, Bradley Wicker TVA Gary DeMoss PSEG A Quaderer Energy Harbor Degonish, Matthew M Westinghouse Larry Nicholson Browne, Eric Vaughan Corey M Wilson Anderson, Victoria NEI Varnedoe, Jennifer Maye Bream, Jeff NRC Loyd, Suzanne Constellation Nuclear Khanna, Meena NRC Matheny, Tara Elizabeth Patel, Vish Parsley, Edward Julka, Anil K. NextEra Creighton S Adsit Ratnagaran, Benny J.
Jeong, Beomhee Lipetzky, Andrew Charles Hope, Kyle D Burg, Rob Meier, Peter Vanover, Donald Stone, Jeffrey L Constellation Nuclear Steven Pope De Rego, Christopher Gilbertson, Anders NRC Hijeck, Paul J.
Hanna, John NRC Stoesz, Alex P.
Enclosure
Olson, Ole H.
Zach, Andrew EPW Tennant, Ryan C: Constellation Nuclear Zoulis, Antonios NRC Arner, Frank NRC Werkheiser, David NRC Robert Drsek Energy Harbor Daniel Weller Energy Harbor Deese, Rick NRC Paul Sicard Entergy Harry Balian PSEG Mohamed M. Talaat Rishel, Robert I Duke Energy Mironenko, Artur N Maioli, Andrea Westinghouse Seeman, Glen A GE Jason Hall Coyne, Kevin NRC Rick Stremple Energy Harbor Krsek, Robert NRC Boatwright, Walter Szews, Heather Davis Presley, Mari EPRI Weerakkody, Sunil NRC Beckton, Joshua S Ratchford, Andy NRC Sandal, Shane NRC Rosebrook, Andy NRC Hiller, Justin W NRC Jason Purvis Loveless, David NRC Hughey, John NRC Garmon-Candelaria, David NRC Kichline, Michelle NRC John Pfabe