ML19219A088
| ML19219A088 | |
| Person / Time | |
|---|---|
| Issue date: | 08/08/2019 |
| From: | Brian Metzger NRC/NRR/DRA |
| To: | Reisi-Fard M NRC/NRR/DRA |
| Metzger B | |
| References | |
| Download: ML19219A088 (5) | |
Text
August 8, 2019 MEMORANDUM TO: Mehdi Reisi-Fard, Acting Chief PRA Licensing Branch B Division of Risk Assessment Office of Nuclear Reactor Regulation FROM:
Brian Metzger, Fire Protection Engineer /RA/
PRA Licensing Branch B Division of Risk Assessment Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF THE JULY 23, 2019, CATEGORY 2 PUBLIC MEETING ON NATIONAL FIRE PROTECTION ASSOCIATION 805 AND FIRE PROBABILISTIC RISK ASSESSMENT FREQUENTLY ASKED QUESTIONS On July 23, 2019, the U.S. Nuclear Regulatory Commission (NRC) staff held a public workshop with industry stakeholders and the public regarding existing National Fire Protection Association (NFPA) 805 and fire probabilistic risk assessment (PRA) frequently asked questions (FAQs) and research projects.
The agenda included the discussion of the following two FAQs:
FPRA FAQ-18-0014: Time to Detection is Zero for Manual Non-Suppression Probability Calculations FPRA FAQ-18-0018: Electrical Non-Suppression Probability
Enclosure:
List of Meeting Attendees CONTACT: Brian Metzger, NRR/DRA 301-415-3972
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The industry indicated that FAQ 18-0018 (ADAMS Accession Number: ML19101A341) will be withdrawn because industry representatives were satisfied with the NRCs plan to update NUREG-2169 (EPRI 3002002936), Nuclear Power Plant Fire Ignition Frequency and Non-Suppression Probability Estimation Using the Updated Fire Events Database.
For FPRA FAQ 18-0014, the staff discussed its comments on the latest draft provided by industry following the last meeting (ML19190A133). Industry acknowledged that they had incorrectly concluded from the last FAQ meeting that the staff would revise the FAQ to align with draft NUREG-2230. Industry indicated that they would revise the scope of the FAQ to align with the approach described in the draft NUREG as well as to distinguish the FAQ from the NUREG.
Specifically, industry indicated that the revised scope of the FAQ would apply to non-cabinet scenarios since NUREG-2230 will adequately cover cabinet sources. Once asked about the technical basis for the approach, industry indicated that they did not plan to provide a similar technical justification as NUREG-2230 for the revised approach in the FAQ. The industry also provided an overview of the basis. The staff indicated that the technical basis needs to be documented in the next revision of the FAQ for staff evaluation and expressed concerns, based on the overview presented by the industry, with the acceptability of the approach if adequate technical justification is not provided. As a result, the staff indicated that staff would review the revised FAQ once sent to the NRC and would communicate a decision during the next meeting on suitability of the FAQ process to pursue the approach described in FAQ 18-0014. Industry confirmed that a revised FAQ will be sent to the NRC before the next public meeting to address issues discussed in the meeting such as technical basis and scope of the FAQ.
Staff from the NRCs Office of Nuclear Regulatory Research (RES) provided an update on the status of the following projects:
Draft NUREG-2178 Vol. 2/EPRI 3002016052 (ML19162A406), Refining and Characterizing Heat Release Rates from Electrical Enclosures During Fire, was issued for public comment on June 28, 2019, with a closing date of August 27, 2019. This report provides improved modeling guidance for the impact of electrical cabinet fires on targets, revised electric motor, pump, and indoor dry transformer heat release rate distributions, new information on cabinet to cabinet fire propagation, and a new model for fire in the main control board. RES and Electric Power Research Institute (EPRI) expect to resolve the public comments received on draft NUREG-2178 Vol. 2 (EPRI 3002016052) and submit the report for publication in September 2019.
Draft NUREG-2230/EPRI 3002016051 (ML19163A293), Methodology for Modeling Fire Growth and Suppression Response for Electrical Cabinet Fires in Nuclear Power Plants, was issued for public comment on July 1, 2019, with a closing date of July 31, 2019. This report modifies the detection and suppression event tree documented in NUREG/CR-6850 to account for detection/suppression by plant personnel prior to automatic detection. Operating experience shows that a significant number of fires are detected by general plant personnel before receipt of a fire alarm. RES and EPRI expect to resolve the public comments received on draft NUREG 2230 (EPRI 3002016051) and submit the report for publication in August 2019.
NUREG-2232/EPRI 3002015997, Heat Release Rate and Fire Characteristics of Fuels Representative of Typical Transient Fire Events in Nuclear Power Plants, is being finalized for publication as a final report. This report documents the results from joint fire testing of transient fuel packages representative of those typically found in nuclear
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power plants and is expected to be published in August 2019. Currently, a working group is analyzing this test data and other information to develop guidance for its use in improved modeling of transient fires in a related report on fire probabilistic risk assessments. The working group held a conference call on July 22, 2019, to discuss the working groups comments on the draft report. The working group is revising the draft fire PRA report to address the issues identified during the call. Once the transient heat release working group has reached consensus and finalized the draft fire PRA report, the report will be provided to Nuclear Reactor Regulation (NRR) for review and comment. The draft report is expected to be issued in October 2019 for public comment after resolution of NRR comments.
NUREG-1921, Supp. 1/EPRI 3002009215: Qualitative Guidance for Main Control Room Abandonment Scenarios and NUREG-1921, Supplement 2/EPRI 3002013023:
Quantification Guidance for Main Control Room Abandonment Scenarios are both publicly available on EPRIs website. The NRC intends to publish both reports in the near future.
RES stated that the Advanced Fire Modeling class, sponsored jointly by NRC and EPRI, will be held the week of July 29th at the National Institute for Standards and Technology and that the Human Reliability Assessment class, sponsored by NRC, will be held the week of August 5th at the NRC in Rockville, MD. Planning for the 2020 Fire PRA Training courses will begin in late September 2019.
RES stated that a meeting to discuss the high energy arc fault testing research project will be held on July 24, 2019, at the NRC in Rockville, MD.
RES indicated that some recent NUREG reports have been identified as representing rules and as such require an Office of Management and Budget (OMB) review. The staff stated that it would keep stakeholders advised of any schedule impacts related to the OMB review.
Industry expressed a concern on timely resolution of technical comments by staff and communication of changes in schedules. The staff indicated that they would continue to communicate potential changes in schedules that may arise from new technical or process issues.
As a Category 2 meeting, the public was invited to participate in the meeting by discussing regulatory issues with the NRC staff at designated points identified on the agenda. There were no public comments provided.
- via email Office NRR/DRA/APLB NRR/DRA/APLB NRR/DRA/APLB Name BMetzger JHyslop MReisi-Fard
- Date 08/ 07 /2019 08/ 07 /2019 08/ 08 /2019 ENCLOSURE 1 National Fire Protection Association (NFPA) 805/ FIRE Probabilistic Risk Assessment (PRA) - Fire Realism Workshop: LIST OF MEETING ATTENDEES July 23, 2019 U.S. Nuclear Regulatory Commission Staff JS Hyslop Mehdi Reisi-Fard Nicolas Melly Brian Metzger David Stroup Susan Cooper Mark Salley Industry Stakeholders Victoria Anderson (Nuclear Energy Institute)
Jana Bergman (Curtiss Wright)
Rob Cavedo (Exelon)
Joelle DeJoseph (Jensen Hughes)
Rodney Pletz (American Electric Power)
Brenden Overton (Nuscale Power)
Jason Floyd (Jensen Hughes)
Ashley Lindeman (Electric Power Research Institute)
Andy Ratchford (Jensen Hughes)
Mark Schairer (Engineering Planning and Management (EPM), Inc.)
Members of the Public N/A