ML19102A310
| ML19102A310 | |
| Person / Time | |
|---|---|
| Issue date: | 05/02/2019 |
| From: | Leslie Perkins NRC/NRR/DLP/PLPB |
| To: | Dennis Morey NRC/NRR/DLP/PLPB |
| Perkins L, NRR/DLP, 415-2375 | |
| References | |
| BL-12-001 | |
| Download: ML19102A310 (5) | |
Text
May 2, 2019 MEMORANDUM TO: Dennis C. Morey, Chief Licensing Processes Branch Division of Licensing Projects Office of Nuclear Reactor Regulation FROM:
Leslie Perkins, Project Manager /RA/
Licensing Processes Branch Division of Licensing Projects Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MARCH 20, 2019, PUBLIC MEETING BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND NUCLEAR ENERGY INSTITUTE AND INDUSTRY REPRESENTATIVES TO DISCUSS INDUSTRYS PROPOSED GUIDANCE FOR ADDRESSING OPEN PHASE CONDITION (NRC BULLETIN 2012-01)
On March 20, 2019, a Category 2 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of the Nuclear Energy Institute (NEI) and the nuclear power plant industry. The purpose of the meeting was for NRC staff to provide feedback to industry on their draft white paper entitled Guidance for Assessing Open Phase Condition Implementation Using Risk Insights. In the draft white paper, NEI proposed a comparison of the change in risk between operating with automatic functions to isolate a power supply affected by an Open Phase Condition (OPC) versus reliance on operator manual action and how this comparison could provide a basis for not enabling the Open Phase Isolation System (OPIS) automatic trip function. NEI discussed during the meeting their plans to revise the OPC Voluntary Industry Initiative (VII) to allow, as an option, the use of the risk-informed option described in the draft white paper.
During the meeting the NRC staff discussed their comments and questions on the draft white paper. In response to the staffs question on the benefit of removing the OPIS automatic trip function, NEI indicated that the open phase isolation system circuitry is very sensitive to electric plant transients resulting from circuit breaker switching, for example, thus potentially resulting in a spurious actuation that could lead to a loss of offsite power. The staff asked the licensees whether there were any spurious actuations identified after the trip functions were enabled for those plants who enabled the trip functions after completing the plant modifications. NEI stated that there were none identified and clarified that spurious actuations were identified only during the testing phase of the plant modifications. The staff also asked about the number of licensees that plan to implement the risk-informed option described in the white paper. NEI stated that most licensees are currently undecided, but they expect that most are interested in using this approach while a few plan to keep the automatic trip function. NEI agreed to be a conduit to collect data on implementation for NEI members, and plan to provide information to the staff by late summer 2019.
The staff questioned why the draft white paper did not include numbers for the increase in risk due to spurious actuations, single failures in the onsite power system, and potential failure of OPIS detection scheme. In response, the industry stated that the number is very site-dependent. In response to staff comments on the OPC operating events, NEI agreed to provide an explanation for why the events for South Texas Project and Oconee Nuclear Station were not included in the initiating event frequency calculation. NEI also provided an explanation of why only U.S. data was used in the calculation. NEI further indicated that they will clarify the difference between the upper and lower OPIS monitoring failure rates, clarify the initiating event frequency numbers on page 11 of the draft white paper, and revise the table on page 5 of the draft white paper to identify the plant configurations.
NEI provided their plans going forward which included: revising the draft white paper in the next two weeks to address, as appropriate, the NRC staff comments discussed during the meeting, revising the VII by the end of April 2019, and providing information on licensees plans for implementation by late summer 2019.
The NRC staff plans to hold another public meeting with NEI to discuss the proposed revisions to the VII, and next steps toward bulletin closure. NRC staff and industrys slide presentations can be found in ADAMS at Accession Nos. ML190978A231 and ML19093B44, respectively.
CONTACT: Leslie Perkins, NRR/DLP (301) 415-2375
Enclosures:
As stated Meeting Participants NRC Slide Presentation NEI Slide Presentation Meeting Notice
ML19102A310 Mtg. Summary; ML19078A231 NRC Slide Presentation; ML19093B844 NEI Slide Presentation; ML19078A305, Mtg. Notice; ML19102A315 Package NRR-106 OFFICE NRR/DLP/PLPB PM*
NRR/DE/EEOB*
NRR/DLP/PLPB/BC NRR/DLP/PLPB/PM NAME LPerkins DWilliams DMorey (JRowley for)
LPerkins DATE 5/1/2019 5/2/2019 5/2/2019 5/2/2019
Enclosure Meeting Participants Names Organization Eric Benner NRC Mike Franovich NRC Roy Mathew NRC Donna Williams NRC Hari Kodali NRC Alex Schwab NRC Billy Dickson NRC Michelle Kichline NRC Jonathan Rowley NRC Khoi Nguyen NRC Vijay Goel NRC Duc Nguyen NRC Stephen Campbell NRC Ismael Garcia NRC Michael G. Wiwel PSEG Nuclear Frances Pimentel NEI Greg Krueger NEI Stephen Geier NEI Derek Corrin DTE Energy Michael Koenemann DTE Energy Michael Zelenak DTE Energy Nasim DTE Energy Robert M. Carritte MPR Associates Susan Richards AEP Nikki DeRosia AEP Matt Johnson Jensen Hughes Richard Anoba Jensen Hughes Stephen Naron Exelon Kazimierz Leja Exelon Scott Geenlee Exelon Dan Brush Exelon Kenneth Leonelli Scana Mike OKeefe Certrec Corporation Phil Lashley First Energy Corporation Joseph Mathew INPO Shawn Simon INPO Alan Jelalian Engineering Planning and Management Inc Wayne Johnson EPRI Leonard Sueper Xcel Energy Gary Miller Dominion Energy Jordon Vaughan Duke Energy Robert Boyer Duke Energy Robert Rishel Duke Energy Jana Bergman Curtiss-Wright Jeffrey Miller Enercon Faramarz Pournia Southern Nuclear Young G. Jo Southern Nuclear Gordon Clefton DOE INL