ML19114A481
| ML19114A481 | |
| Person / Time | |
|---|---|
| Issue date: | 04/25/2019 |
| From: | Alexander Schwab NRC/NRR/DRA/APOB |
| To: | Antonios Zoulis NRC/NRR/DRA/APOB |
| References | |
| Download: ML19114A481 (5) | |
Text
April 25, 2019 MEMORANDUM TO: Antonios M. Zoulis, Acting Chief PRA Oversight Branch Division of Risk Assessment Office of Nuclear Reactor Regulation FROM: Alexander H. Schwab, Reliability /RA/
and Risk Analyst PRA Oversight Branch Division of Risk Assessment Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MARCH 21, 2019 PUBLIC MEETING TO CONTINUE DISCUSSIONS BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND INDUSTRY RISK-INFORMED STEERING COMMITTEES On March 21, 2019, the U.S. Nuclear Regulatory Commission (NRC) staff held a Category 2 public meeting between the NRC and industry Risk Informed Steering Committees (RISCs). The meeting notice and presentations used to facilitate discussion are available in the Agencywide Documents Access and Management System (ADAMS), at Accession Number ML19077A189 and Accession Number MLXXXXXXXXX, respectively. The list of meeting participants is provided as an enclosure to this document. Staff did not receive any public meeting feedback forms as a result of this meeting.
Both the NRC and Industry had opening remarks and discussed the agenda. During these discussions staff provided status updates on 50.69 License Amendment Request reviews, Technical Specification Task Force (TSTF) 505, New Probabilistic Risk Assessment (PRA)
Methods, Fire PRA Realism, Treatment of FLEX in Risk Informed Decision Making, Tornado Missile Risk Evaluator (TMRE), Open Phase Condition (OPC), the Low Safety Significance Issue Resolution Working group, risk informing security, prioritization of risk related efforts, and the update to the NRC RISC Charter. The industry RISC discussed High Energy Arc Faults (HEAFs). Details on each of these topics can be seen below.
Opening Remarks The NRC opened by requesting that the industry provide prioritization of the different ongoing risk related efforts. This would allow NRC management insights into resource allocation.
10CFR 50.69 The NRC mentioned that all the plants on the milestone list are on schedule with 2 exceptions.
These exceptions involve treatment of key assumptions and uncertainties as discussed in NUREG-1855.
CONTACT: Alexander H. Schwab, NRR/DRA 301 415-8539
A. Zoulis TSTF 505 The Industry stated their position that Facts and Observations (F&Os) reviewed during a 50.69 application review should not be reopened for a TSTF 505 application.
The NRC disagreed and remarked that F&Os may have different implications for a TSTF 505 application requiring additional review, and that if the more complicated TSTF 505 review occurred before the 50.69 review, then the F&Os would not likely need to be revisited.
New Methods The NRC asked about the timing of the selection of the pilot plants for new methods, and industry replied that they should have the pilot plant lined up by late April or early May. The NRC mentioned that there is further work to be done before NRC will be able to endorse an approach for disposition of new methods.
Fire Probabilistic Risk Assessment Realism Industry requested that Electric Power Research Institute (EPRI) receive input faster on FAQs from the NRC. They also indicated that if the NRC didnt have the resources, EPRI could push forward and publish the report without NRC input to ensure timeliness. The industry believes that current calculated plant fire risk could be a factor of 10 lower using the new methods and/or approaches.
The NRC remarked that they would work to make sure that appropriate resources were applied to ensure timely resolution of FAQs.
Crediting FLEX in Risk-Informed Decision Making Industry remarked that the soon to be published NRC expert elicitation paper on Human Reliability Analysis (HRA) on FLEX equipment is conservative thus leading to insufficient FLEX credit.
The NRC responded by saying the work is draft and not final and that the topic warrants elevated management attention on both sides to produce realistic HRA estimates. The NRC will work with the industry to identify the next steps.
TMRE (Tornado Missile Risk Evaluator)
The NRC remarked that the industry should be working on a roadmap to guide remaining implementors on how to use the pilot plant Safety Evaluations and Nuclear Energy Institute (NEI) 17-02. The NRC also stated that they could provide quick turnaround on a TMRE topical report review. Industry stated that they would consider this.
HEAFs (High Energy Arc Faults)
Industry remarked that they wanted to make sure that the HEAF testing is accounting for the proper zone of influence and the fragility of the equipment in the zone.
A. Zoulis Low Safety Significance Issue Resolution Working Group The NRC explained that the purpose of the working group is to find and document an approach for resolving issues of low safety significance and in the process more efficiently allocate resources. Industry remarked that they were very supportive of the working groups goal.
However, the industry also offered that the final approach should not be itself resource intensive.
The NRC summarized the previous days public meeting at which the NRC gave feedback on an industry whitepaper. The whitepaper provided proposed risk informed guidance on whether the licensees had to keep their Open Phase Isolation System (OPIS) in alarm only versus automatic actuation mode. The NRC also stated that if the Voluntary Industry Initiative (VII) was modified to allow for staying in alarm only, the NRC would need to inspect the implementation of the VII for some licensees who chose to stay in alarm only.
The NRC and industry agreed that the white paper was a good example in using risk informed decision making.
Risk-Informing Security Industry stated that there was an NRC public meeting on the subject earlier in the day, and that they planned to keep those activities separate from the RISC. The NRC asked if there were any advanced reactors insights that could help the current fleet. The industry replied that there wasnt anything at this point.
Prioritization of Risk Related Efforts The NRC ask for suggestions on how they should prioritize NRC resources on the previously discussed issues. Industry indicated that 1) the issue of EPRI FAQ closure on Fire PRA realism research, and 2) the F&O closure issue should be prioritized. The NRC requested continuing input on prioritization.
NRC RISC Charter Update The NRC explained where it is in updating the RISC charter to increase the charters relevance to other NRC offices other than NRR. There was some discussion on whether it would be beneficial to divide up the RISC meetings so that there could be a broader discussion on risk-related issues at the beginning of the meeting relevant to all offices before splitting into a more detailed discussion for the operating reactor fleet.
Closing Remarks The public was given an opportunity to ask questions or make comments, no one chose to do so. The NRC RISC chair then thanked the participants and closed the meeting.
Enclosures:
- 1. List of Meeting Attendees
- 2. Risk Informed Steering Committee NRC Activity Status
- 3. 2019 Chart of RISC Milestones - March 2019
ML19114A481 *via-email NRR-601 OFFICE NRR/DRA/APOB NRR/DRA/APOB: (A) BC NAME ASchwab AZoulis*
DATE 4/25/2019 4/23/2019 LIST OF MEETING ATTENDEES Name Organization John Lubinski NRC George Gellrich Exelon Gregory Krueger NEI Roy Linthicum PWROG Sunil Weerakkody NRC Mike Cheok NRC Doug True NEI Bob Bement APS/Palo Verde Victoria Anderson NEI Chris Nolan Duke Energy Jeff Stone Exelon Shawn St. Germain INL Ed Miller NRC Eric Benner NRC Alexander Schwab NRC Dick Speer Ares Security Corp Mandy Halter Entergy Jana Bergman Curtiss-Wright John Monninger NRC Mike Wentzel NRC Mehdi Reisi Fard NRC Tim Reed NRC Jeff Mitman NRC Michael Montecalvo NRC Yang Hsien J. Chang NRC Kelli Voelsing EPRI Stephen Grier NEI Rick Grantom* JCNRM Tim Sande* Enercon Keith Tetter* NRC Justin Hiller* Ameren Missouri Jermaine Heath* NRC Robert Rishel* Duke Energy Anders Gilbertson* NRC Larry Nicholson* Certrec Corporation Candace De Messieres* NRC Jeff Circle* NRC Julio Lara* NRC
- Participated by teleconference Enclosure 1