ML22164A884
| ML22164A884 | |
| Person / Time | |
|---|---|
| Issue date: | 06/22/2022 |
| From: | Jacqueline Thompson NRC/NRR/DEX/EXHB |
| To: | Bauer L NRC/NRR/DEX/EXHB |
| Jenise Thompson 301-415-0381 | |
| References | |
| Download: ML22164A884 (6) | |
Text
June 22, 2022 MEMORANDUM TO: Laurel Bauer, Acting Chief External Hazards Branch Division of Engineering and External Hazards Office of Nuclear Reactor Regulation FROM: Jenise Thompson, Geologist /RA/
External Hazards Branch Division of Engineering and External Hazards Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MAY 17, 2022, PUBLIC MEETING TO DISCUSS THE EVALUATION OF NEW SEISMIC MODELS WITHIN THE PROCESS FOR THE ONGOING ASSESSMENT OF NATURAL HAZARDS INFORMATION FRAMEWORK On May 17, 2022, the U.S. Nuclear Regulatory Commission (NRC) staff held a public meeting with stakeholders to discuss the evaluation of new seismic models as part of the process for ongoing assessment of natural hazard information (POANHI). The meeting notice is available in the NRCs Agencywide Documents Access and Management System (ADAMS) at Accession No. ML22131A035, and the presentation slides are available at ADAMS Accession No. ML22132A299. The enclosure to this summary provides the attendees for the meeting as captured by Microsoft Teams.
The purpose of this meeting was to discuss the staffs evaluation of new seismic models, including NGA-East, within the POANHI framework. The staff presented the status of the project, plans for prioritization and screening criteria for plant-specific re-evaluations and a revised schedule for future activities and public interactions. This meeting was the first in a series of public meetings that will be held on this topic with subsequent meetings scheduled for late summer 2022 and early winter 2022.
Meeting Highlights The meeting included a staff presentation and subsequent discussion of the following topics:
- Background on recent seismic work including NGA-East, RIL-2021-15, and NUREG/KM-0017, all of which are informing the ongoing evaluation of seismic hazards at operating reactors
- Status of project and an example site for which the staff completed the evaluation
- Plans for prioritization and screening criteria for plant-specific evaluations
- Revised project schedule including future public meetings
- Process by which stakeholders can submit comments and feedback to the staff throughout the project
L. Bauer POANHI Framework Several questions were asked pertaining to the POANHI framework, how information is received and when information is entered into the framework. The staff clarified that the information for this seismic project comes from several sources and projects that were undertaken outside of the POANHI framework, including GI-199, the NGA-East project, RIL 2021-15, and the seismic reevaluations performed in response to Recommendation 2.1, as documented in NUREG/KM-0017. The staff also clarified that each of these information sources are separate from the POANHI framework and referred to NRR Office Instruction LIC-208 for an explanation of how the information enters the framework. The staff also clarified that the impact of new information on the approved licensing basis will be considered in conjunction with 10 CFR 50.69.
Prioritization and Screening Meeting attendees asked several questions related to the prioritization and screening processes. The NRC staff clarified that the prioritization is taking a risk-informed approach by looking for the highest hazard changes based on the new information and using the site adjustment factors from the NUREG/KM-0017 to highlight the differences. The staff is still working through the prioritization, which takes about ten days per site to analyze.
For screening, the staff is comparing the updated hazard results to the previous hazard submitted by licensees in response to the NTTF Request 2.1 and the hazard updates provided in NUREG/KM-0017. The current evaluation of the hazard information will incorporate the NGA-East ground motion model as well as the lessons-learned from the NRC sponsored site response analysis study (RIL2021-15). Once the hazard results are complete for each of the plant sites the NRC staff will combine the hazard curves with estimates of the plant seismic fragility to determine the change in seismic risk. In addition to the change in seismic risk, the NRC staff will also consider other site- and plant-specific factors. As such, screening will not be solely based on numerical criteria, but will consider all information on the hazard and risk.
Other Technical Questions Multiple participants asked the staff several more detailed technical questions, including whether the staff would consider seismic modifications implemented by licensees in response to recent NTTF Recommendation 2.1 SPRA efforts and the staff indicated that they would be open to receiving that information and will specifically look at the dominant risk contributors for potential impacts from the new hazard in considering future actions.
Feedback and Future Communications The staff received several suggestions to improve communications on this project and to allow stakeholders to provide feedback. The NRC staff shared that a dedicated resource box (POANHI.Seismic@nrc.gov) is available to receive any comments or feedback in the period between public meetings. The staff also noted that this resource box can be used to provide any comments on the content of NUREG/KM-0017. Furthermore, the NRC staff clarified that they would consider additional public meetings, if warranted, based on the project progress or comments received. The NRC staff are also looking into different options to share comments received and will provide additional information at a later date. The staff also clarified that stakeholders using the email option will receive a confirmation email but that
L. Bauer responses to individual comments will vary depending on the content of the email and stage of the process. The staff also acknowledges that plant-specific discussions may be needed at some point but will try to keep public meetings more generic with wider applicability to minimize resource burdens on industry and NRC staff.
L. Bauer
SUBJECT:
SUMMARY
OF MAY 17, 2022, PUBLIC MEETING TO DISCUSS THE EVALUATION OF NEW SEISMIC MODELS WITHIN THE PROCESS FOR THE ONGOING ASSESSMENT OF NATURAL HAZARDS INFORMATION FRAMEWORK DATED: JULY 22, 2022 DISTRIBUTION:
PUBLIC RidsNrrDex Resource LBauer, NRR CMunson, NRR DHeeszel, NRR JThompson, NRR SStovall, RES TWeaver, NRR DSeber, NRR SVasavada, NRR ADAMS Accession Number: ML22164A884 *via email Office NRR/DEX/EXHB/PM NRR/DEX NRR/DEX/EXHB/BC Acting Name JThompson* CMunson* LBauer*
Date 06/13/2022 06/22/2022 06/22/2022 Official Record Copy
May 17, 2022, Public Meeting to Discuss Evaluation of New Seismic Models Attendance List*
Name Affiliation Name Affiliation Matthew Degonish Ameren (Callaway) Jenise Thompson NRC Jamey Turner BGC Engineering Ed Miller NRC Philip Tarpinian Jr Constellation Nuclear Clifford Munson NRC Michael Joseph Constellation Nuclear Scott Stovall NRC McDonald Rob Burg Engineering Planning Dogan Seber NRC and Management (EPM),
Inc.
Rob Choromokos EPRI David Heeszel NRC John Richards EPRI Laurel Bauer NRC Vince Andersen Jensen Hughes, Thomas Weaver NRC Constellation Risk Management Team Brian Song Kairos Power Shilp Vasavada NRC Hadi Razavi Kairos Power Sunwoo Park NRC Gabriel Toro Lettis Consultants, Eric Benner NRC International Frances Pimentel NEI Alex Collier NRC Thomas Basso NEI Weijun Wang NRC Brett Titus NEI Rasool Anooshehpoor NRC Jennifer Uhle NEI Kevin Quinlan NRC Nozar Jahangir PG&E Jose Pires NRC Dennis Schumaker PSEG Se-Kwon Jung Not available (NA)
Gary DeMoss PSEG - Salem & Hope Larry Lee NA Creek Mohamed M. Talaat Simpson, Gumpertz & Antonio Fernandez NA Heger Gregory S. Hardy Simpson Gumpertz & Deborah A Luchsinger NA Heger Rachel A. Christian Westinghouse Jeffrey Bachhuber NA Jill Monahan Westinghouse Eric A Schindelbeck NA Raymond C. Wang X-Energy Justin W Hiller NA Luke McSweeney X-Energy Vish Patel NA Melanie H. Brown NA Ricardo E. Rodriguez NA Wayne Massie NA Brian Burgio NA Victoria Anderson NA Stephen Vaughn NA Robin McGuire NA De Wu NA
Shahin Seyedhosseini NA Mark Zellman NA Steven Alferink NA Joe Vasquez NA Kaven Liu NA Fernando Ferrante NA Robert I Rishel NA Andrew Mauer NA Jinsuo Nie NA Mory Diané NA Richard Stadtlander NA
- Attendance list based on Microsoft Teams Participant list. List does not include 9 individuals that connected via phone.