ML22300A097
| ML22300A097 | |
| Person / Time | |
|---|---|
| Issue date: | 10/25/2022 |
| From: | Carla Roque-Cruz Division of Operating Reactor Licensing |
| To: | Kevin Hsueh Office of Nuclear Reactor Regulation |
| References | |
| Download: ML22300A097 (6) | |
Text
October 25, 2022 MEMORANDUM TO: Kevin Hsueh, Chief Radiation Protection and Consequence Branch Division of Risk Assessment Office of Nuclear Reactor Regulation FROM: Carla Roque-Cruz, Project Manager /RA/
Licensing Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF THE AUGUST 24, 2022, SOURCE TERMS AND RADIOLOGICAL CONSEQUENCE ANALYSES On August 24, 2022, the U.S. Nuclear Regulatory Commission (NRC) staff held an Observational Public Meeting to discuss source terms and radiological consequence analyses.
The NRC provided a presentation on the basis for the source term in the proposed Revision 1 to Regulatory Guide (RG) 1.183, Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors Draft Regulatory Guide, DG-1389. The presentation focused on the results and information contained in Sandia National Lab report Accident Source Terms for Light-Water Nuclear Power Plants Using High-Burnup or MOX Fuel, SAND2011-0128 January 2011 and can be found at Agencywide Documents Access and Management System (ADAMS) (ML20093F003). The Nuclear Energy Institute provided a presentation, focusing on the impact of the revised guidance on boiling water reactors (BWRs) and including the results of three example calculations that used selected aspects of DG-1389.
Analyses results, which exceeded the regulatory limits, were used to comment that certain aspects of the proposed guidance needed to be revised in order for the guidance to be usable.
Specifically, industry proposed that the resolution to the higher doses was to update the BWR release fractions with different accident scenarios selection and to credit suppression pool scrubbing in the BWR release fractions. The meeting notice can be found at Accession ADAMS No. ML22235A752. The NRC slides and industry meeting slides can be found at ADAMS Accession Nos. ML22229A071 and ML22235A703 respectively.
The NRC staff discussion of the basis for the proposed source term, noted that the process of providing revised release fractions took many years of work and the industrys proposal to remove station blackout sequences, would likely make the release fractions larger. The staff also observed that the industry examples, contained unusual assumptions that likely contributed to the results of some examples exceeding the regulatory limits.
Enclosure:
List Of Attendees CONTACT: Sean Meighan, NRR/DRA 301-415-9094
K. Hsueh During the meeting, in response to a question related to the RG revision schedule, the staff noted that it continues to work toward the December 2022 milestone to issue the final RG consistent with what was communicated during the March 2022 ACRS meeting.
Staff from the Union of Concerned Scientists provided a comment related to the use of obsolete guidance (RG 1.183 Revision 0) rather than using improved knowledge (Revision 1).
The staff explained the issues with the Commission direction on the backfitting/forward fitting considerations and stated that certain changes using Revision 0 would need a justification of the methods used and license amendment requests are subject to the NRCs safety evaluation.
No regulatory decisions were made in the meeting.
Enclosure:
List of Attendees
K. Hsueh
SUBJECT:
SUMMARY
OF THE AUGUST 24, 2022, PUBLIC MEETING - SOURCE TERMS AND RADIOLOGICAL CONSEQUENCE ANALYSES DATED: 10/25/2022 DISTRIBUTION:
PUBLIC RidsNrrDRA HEsmaili, RES KHsueh, NRR Accession No.: ML22300A097 NRR-106 OFFICE NRR/DORL/LLPB NRR/DRA/ARCB RES/DSA/FSCB NRR/DRA/ARCB: BC NAME CRogue-Cruz SMeighan HEsmaili KHsueh DATE 10/24/2022 10/21/2022 10/24/2022 10/25/2022 OFFICIAL RECORD COPY
LIST OF ATTENDEES Public Meeting to Discuss Source Terms and Radiological Consequence Analyses August 24, 2022 U.S. Nuclear Regulatory Commission (NRC)
First Name Last Name Brent Ballard Andrew Barto Philip Benavides Mark Blumberg Shawn Campbell Sheldon Clark James Corson Stephanie Devlin-Gill Elijah Dickson Hossein Esmaili Mike Franovich Nicholas Hansing Trey Hathaway Kevin Heller Linda Howell Kevin Hsueh Tara Inverso Lois James Stacy Joseph Daniel King John Lehning Don Marksberry Sean Meighan Joseph Messina Tony Nakanishi John Parillo Jason Piotter April Pulvirenti Carla Roque-Cruz Michael Salay Zhe Yuan Enclosure
U.S. Nuclear Regulatory Commission (NRC)
First Name Last Name Edward Stutzcage Shilp Vasavada Kimberly Webber John Wise Mary Frances Woods Non-NRC First Name Last Name Affiliation (if provided)
Don R Algama DOE Jill P Anderson Uriel Bachrach David C Basham Constellation Nuclear Thomas Basso Dwayne Blaylock Butch Bornt Rob Burg Johnathan Chavers Yong-Joon Choi Joe Coletta Aladar Csontos Caryl D Robert Daum EPRI Jeremiah Doyle NuScale Thomas Eichenberg Bjrn Engstrm Gst William P. Evans SNC Corporate Jacob Fakory DEP Madeline Feltus DOE Jeff Gabor Jensen Hughes Shane Gardner GE Power Portfolio Lisa Gerken FRA-FL Jeffrey Head Randy H. Jacobs GE Power Portfolio Shane Jurek Sean T. Kinnas Peter W Kissinger Jeffrey R. Kobelak Samuel Lafountain David Lyle Luxat Sandia National Labs Edwin Lyman Jill Magnusson NuScale Alex J Markivich Services - 6 John R Massari Constellation Nuclear Nicolas Mertz Dave Mitchell Lisa Momkus Oklo Etienne Mullin NuScale Carole Naugle FRA-FL Ann Pfaff DEP J. Phillips Frances Pimentel
Non-NRC First Name Last Name Affiliation (if provided)
Douglas P Pollock Monica Ray Eric Scott PSEG Neil Sheehan Fred Smith Scott Stanchfield Entergy Adam Stein Breakthrough Institute (BTI)
Charles Stroupe Lawrence Svetlana Christie B Taylor Brian M Timm Jennifer Uhle Daniel J Vincent Chris Walker Lauren Williams GE Power Portfolio Note: Attendance list based on Microsoft Teams participant. This list does not include individuals who did not provide their last name either in registering for the meeting or by a follow-up email.