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MONTHYEARML12338A0762012-12-0404 December 2012 Notice of Forthcoming Preapplication Meeting on 12/18/12 with Pacific Gas and Electric Company to Discuss Leak Before Break Assumptions Used in 10 CFR 50.46 Evaluation for Diablo Canyon, Units 1 and 2 Project stage: Meeting ML12355A1612012-12-18018 December 2012 PG&E Handouts from the December 18, 2012, Meeting with the NRC Related to Emergency Core Cooling System Evaluations (TAC Nos. MF0313 and MF0315) Project stage: Meeting ML12355A1502013-01-22022 January 2013 Summary of Preapplication Meeting with Pacific Gas and Electric Company to Discuss Leak Before Break Assumptions Used in 10 CFR 50.46 Evaluation for Diablo Canyon, Units 1 and 2 Project stage: Meeting 2012-12-04
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Category:Meeting Summary
MONTHYEARML24157A0252024-07-0101 July 2024 Memo to Michelle Rome Summary of 4/4/2024 Meeting with CA Shpo ML24143A1202024-06-0303 June 2024 Memo to Michelle Rome Summary of 4/5/2024 Meeting with Ytt ML24108A1482024-05-0707 May 2024 February 2024 Environmental Scoping Meetings Related to the Diablo Canyon LRA - Memo ML24108A1472024-05-0707 May 2024 February 2024 Diablo Canyon Public Scoping Meetings - Summary ML23268A4072023-09-27027 September 2023 Summary of September 19, 2023, Closed Public Meeting with Pacific Gas and Electric Company Regarding Alternative Security Measures for Early Warning System License Amendment Request for Diablo Canyon Nuclear Power Plant, Units 1 and 2 ML23265A1902023-09-26026 September 2023 Meeting Summary: September 13, 2023 Diablo Canyon, Units 1 and 2 License Renewal Application Pre-Application Meeting ML23143A2262023-06-0101 June 2023 May 3, 2023, Summary of Public Meeting to Discuss the End of Cycle Assessment and Pre-Submittal License Renewal Process Overview for Diablo Canyon Power Plant, Units 1 and 2 ML22272A5072022-09-29029 September 2022 Summary of September 27, 2022, Closed Meeting with Pacific Gas and Electric Company Regarding Planned Security Plan Changes for Diablo Canyon Nuclear Power Plant, Units 1 and 2 ML22147A0932022-06-0606 June 2022 2021 Annual Assessment Public Meeting Summary ML22126A0162022-05-0909 May 2022 Summary of April 27, 2022, Closed Teleconference with Pacific Gas and Electric Company Regarding Alternative Security Measures for Early Warning System License Amendment Request for Diablo Canyon Nuclear Power Plant, Units 1 and 2 ML21246A0202021-09-0808 September 2021 Summary of August 30, 2021, Pre-Submittal Teleconference with Pacific Gas and Electric Company Regarding a Post-Shutdown Emergency Plan License Amendment Request for Diablo Canyon Nuclear Power Plant, Units 1 and 2 ML21140A3892021-05-24024 May 2021 Riv Column 1 EOC 2020 Public Meeting Summary ML20332A1802020-12-0101 December 2020 Summary of November 24, 2020, Pre-Submittal Teleconference with Pacific Gas and Electric Company a Permanently Defueled Technical Specification License Amendment Request ML20231A6522020-08-24024 August 2020 Summary of Teleconference with Pacific Gas & Electric Company Regarding an Exigent Amendment Request to Modify Diablo Canyon Power Plant, Units 1 & 2, Technical Specification 3.7.5, Auxiliary Feedwater (AFW) System EPID L-2020-LLA-017 ML20189A2832020-07-0707 July 2020 Summary of Region IV Annual Assessment Public Meeting ML19318F5272019-11-15015 November 2019 Summary of the August 27, 2019, Public Meeting Near the Diablo Canyon Nuclear Power Plant Regarding the Establishment and Operation of Community Advisory Boards ML19196A0742019-07-22022 July 2019 Summary of Meeting with Pacific Gas and Electric Company Regarding Forthcoming Activities Associated with Diablo Canyon Nuclear Power Plant, Units 1 and 2 Planned Decommissioning ML19064B2652019-03-14014 March 2019 Summary of February 28, 2019, Public Meeting with Pacific Gas and Electric Company to Discuss the Proposed Relief Request Concerning Reactor Vessel Internal Visual Examination for the Diablo Canyon Nuclear Power Plant, Units 1 & 2 ML18348A4202018-12-31031 December 2018 Summary of Meeting with Pacific Gas & Electric Co. to Discuss Exemption Request to Withdraw Funds from the Nuclear Decommissioning Trusts to Fund Decommissioning Planning Activities at Diablo Canyon Nuclear Power Plant ML18207A7332018-08-10010 August 2018 Summary of Pre-Licensing Meeting with PG&E Co. to Discuss the Proposed LAR to Implement WCAP-16996-A, Revision 1, Realistic LOCA Evaluation Methodology Applied to the Full Spectrum of Break Sizes at Diablo Canyon ML17198A6032017-07-17017 July 2017 Summary of Annual Assessment Meeting Regarding Diablo Canyon Power Plant 2016 Performance ML16190A1782016-07-0808 July 2016 Summary of Annual Assessment Town Hall Meeting and Public Outreach Regarding Diablo Canyon Power Plant 2015 Performance ML16011A2042016-01-14014 January 2016 Summary of Conference Call on January 7, 2016, Between the U.S. NRC and Pacific Gas and Electric Co. Concerning the Responses to RAI for the Review of the Diablo Canyon Power Plant, Units 1 and 2, License Renewal Application (CAC Nos. 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Initiati ML15233A4912015-09-0101 September 2015 August 5, 2015, Public Scoping Meetings for the Environmental Review of the Diablo Canyon Power Plant, Units 1 and 2 License Renewal Application ML15209A9442015-07-28028 July 2015 June 24, 2015, Summary of Annual Assessment Meeting with Pacific Gas and Electric and Public Open House Regarding Diablo Canyon Power Plant 2014 Performance ML15125A1862015-05-27027 May 2015 April 28, 2015, Summary of Category 1 Public Meeting with Pacific Gas and Electric Company to Discuss Diablo Canyon'S Seismic Hazard Reevaluation Associated with Implementation of Japan Lessons-Learned Near-Term Task Force Recommendation 2. ML15134A2572015-05-18018 May 2015 5/7/15 Summary of Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML15092A0792015-04-16016 April 2015 July 14-17, 2014 - Summary of Diablo Canyon, Units 1 and 2, Audit to Adopt National Fire Protection Association NFPA 805, Performance-Based Standard for Fire Protection for LWR Generating Plants (2001 Edition) ML15069A0952015-03-24024 March 2015 Summary of Telephone Conference Call Held on March 4, 2015 Between the U.S. Nuclear Regulatory Commission and Pacific Gas and Electric Company Concerning the Diablo Canyon Power Plant, Units 1 and 2, License Renewal Application ML15043A1992015-02-19019 February 2015 2/3/2015 Summary of Meeting with Pacific Gas and Electric Regarding Presubmittal Discussion on Alternate Source Term License Amendment Request for Diablo Canyon Power Plant, Units 1 and 2 ML15037A2482015-02-0505 February 2015 Summary of Regulatory Conference to Discuss Safety Significance of Diablo Canyon Power Plant Protective Action Recommendations for Areas of the Ocean Finding ML14350A2712014-12-22022 December 2014 Summary of 12/11/14 Preapplication Meeting with Pacific Gas and Electric Company to Discuss License Amendment Request to Support Installation of 500 Kilovolt Output Generator Breakers at Diablo Canyon, Units 1 and 2 ML14029A4502014-12-10010 December 2014 Summary of 12/18/13 Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML14295A7332014-11-17017 November 2014 9/24/14 Summary of Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML14197A3522014-07-22022 July 2014 7/9/14 Summary of Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML14157A0912014-06-17017 June 2014 Summary of 5/21/14 Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML14155A3742014-06-0404 June 2014 May 22, 2014, Summary of Annual Assessment Meeting with Pacific Gas and Electric Regarding Diablo Canyon Power Plant 2013 Performance ML14113A4932014-05-0606 May 2014 Summary of Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML14113A4222014-04-23023 April 2014 Public Meeting with Pacific Gas & Electric (Pg&E)To Discuss the Operating Performance for Diablo Canyon Power Plant for the Period January 1 - December 31, 2013 ML13329A4172013-12-30030 December 2013 Summary of Meeting with Pacific Gas and Electric Company to Discuss Digital Replacement of Process Protection System at Diablo Canyon Power Plant, Units 1 and 2 ML13354C0912013-12-23023 December 2013 Summary of Annual Assessment Meeting with Pacific Gas & Electric Re Diablo Canyon Nuclear Power Plant 2012 Performance ML13282A3822013-11-0707 November 2013 10/2/2013 Summary of Pre-Application Meeting with Pacific Gas and Electric Company to Discuss Upcoming Structural Weld Overlay Relief Request to Use an Alternative to Disposition Detected Laminar Indications at Diablo Canyon, Unit 2 2024-07-01
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 22, 2013 LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Power Plant, Unit Nos. 1 and 2
SUBJECT:
SUMMARY
OF DECEMBER 18, 2012, MEETING WITH PACIFIC GAS AND ELECTRIC COMPANY RELATED TO EMERGENCY CORE COOLING SYSTEM EVALUATIONS (TAC NOS. MF0313 AND MF0315)
On December 18, 2012, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Pacific Gas and Electric Company (PG&E, the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss Emergency Core Cooling System (ECCS) evaluations including leak-before-break (LBB) assumptions used in Section 50.46 of Title 10 of the Code of Federal Regulations (10 CFR) coolable geometry evaluation for Diablo Canyon Power Plant, Unit Nos. 1 and 2 (DCPP). The meeting notice and agenda, dated December 4,2012, are available in the Agencywide Documents Access and Management (ADAMS) at Accession No. ML12338A076. The licensee's meeting slide presentation is available at ADAMS Accession No. ML12355A161. A list of attendees is provided in the Enclosure.
During the meeting, PG&E described an issue that it is in the process of addressing that was identified as part of the licensing basis verification project (LBVP) for DCPP. The LBVP is a program to verify the DCPP licensing basis and to identify and correct deficiencies. The issue that was identified as part of the LBVP relates to the way that the use of the LBB methodology was incorporated into the DCPP licensing basis. The current DCPP fuel assembly seismic and loss-of-coolant accident (LOCA) structural analysis is documented in a DCPP-specific report (WCAP-16946) that supported reactor vessel head replacements at the site in the 2010 time frame. This WCAP was not reviewed by the NRC staff. The methodology for the fuel structural analysis was based on NRC-approved methods found in WCAP-9401-P-A, "Verification and testing Analysis of the 17x17 Optimized Fuel Assembly," dated August 1981. The WCAP-9401-P-A methodology does not credit LBB.
There are two issues that PG&E is trying to resolve associated with WCAP-16946:
- PG&E did not perform a 10 CFR 50.59 review for a change when LBB methodology was implemented to exclude the dynamic effects of a break in the main loop piping in the fuel assembly structural analysis.
The results of the fuel assembly structural analyses are used in part to demonstrate compliance with the 10 CFR 50.46(b)(4) fuel coolable geometry requirements.
- 2
- It is not clear to PG&E at this point whether, in accordance with the 10 CFR 50.59 requirements, the change in LBB methodology required prior NRC approval before it was implemented. Key to PG&E's determination is whether or not the NRC staff has previously approved LBB methodology in the fuel assembly structural analyses used to demonstrate compliance with 10 CFR 50.46(b)(4) fuel coolable geometry requirements.
PG&E cited several documents associated with LBB that the NRC staff had reviewed and approved. However, the staff noted that none of the documents specifically requested approval by the NRC in this area. During the meeting the NRC staff provided the following preliminary observations and insights based on PG&E's presentation and discussion:
- It is not clear to the NRC staff if there is a restriction on fuel assemblies that have grid deformation that would prevent them from being used in control rod locations. If there was such a restriction it could address possible concerns with control rod insertion evaluations.
- The staff noted that WCAP-9401 used a vessel inlet break, after LBB assumptions were used a different break location was assumed. It is not clear to the staff how WCAP-9401 and LBB assumptions were combined in the fuel structural analysis area without needing prior approval from the NRC.
- WCAP-9401 lists the break locations that could be used. In 1993 when LBB was approved (for Diablo Canyon), it appears that the break location was changed without requesting prior approval from the NRC for the impacts on fuel structural analysis. The logic for making changes to the break location for the fuel structural analysis without requesting prior approval from the staff is not clear to the staff.
- In the past the staff has accepted .grid assembly deformation in the exterior portions of the reactor core, but interior assembly grid deformation is an additional concern when it occurs.
- The staff noted that it specifically approved the use of LBB for fuel structural analyses for other vendors. This approval does not appear to have been requested for Westinghouse plants.
- The staff noted that guidance in this area could be developed and placed in Standard Revision Plan 4.2, Fuel System Design," as part of the update that is currently in progress.
- It is not clear to the staff if it would be appropriate to use LBB for the control rod insertion analyses. Further if a licensee did use LBB for such an analysis it is not clear if NRC staff approval would be needed.
- If it is determined that there is an issue with WCAP 9401, the staff would prefer a generic approach for resolving the issue (e.g., NRC staff approval of a revision to WCAP 9401 to specifically credit LBB in the fuel structural analysis). A generic
- 3 approach to resolving the issue would appear to be the most efficient use of NRC and licensee resources.
- The NRC staff indicated that there does not appear to be an immediate safety concern and that there is time to develop a resolution plan, if needed, to resolve the issue.
No decisions were made during the meeting as to whether or not prior NRC approval is needed for such a change. The following actions were identified:
- PG&E will make a determination as to whether or not prior approval from the NRC is required when the LBB methodology was implemented to exclude the dynamic effects of a break in the main loop piping in the fuel assembly structural analysis. The decision will be documented in the DCPP corrective action program.
- The NRC staff will review the corrective action program documentation and follow the appropriate regulatory process for addressing any concerns that the NRC staff may have related to PG&E's documentation. This will include any issues associated with PG&E not reviewing WCAP-16946 changes in accordance with the 10 CFR 50.59 process in the 2010 time frame and PG&E's pending decision related to whether or not prior NRC approval is needed for such a change. If PG&E decides that prior approval from the NRC is not needed, the staff will document its review of PG&E's decision using the inspection process and document the results of its review, if appropriate, in an NRC inspection report. If PG&E decides that prior approval from the NRC is needed, then the staff expects that a license amendment request will be submitted to the NRC and reviewed by the staff in accordance with the established process. In either case, if the NRC staff believes that there is a potential issue that could affect more than DCPP, the staff will place the issue in the appropriate generic resolution process.
- 4 Please direct any inquiries to me at 301-415-1132 or . ov.
Docket Nos. 50-275 and 50-323
Enclosures:
list of Attendees cc w/encl: Distribution via listserv
LIST OF ATTENDEES DECEMBER 18. 2012, MEETING WITH PACIFIC GAS AND ELECTRIC COMPANY REGARDING DIABLO CANYON POWER PLANT, UNITS 1 AND 2 EMERGENCY CORE COOLING SYSTEM EVALUATIONS DOCKET NOS. 50-275 AND 50-323 NAME ORGANIZATION Jeff Summy Pacific Gas and Electric Kenneth Schrader Pacific Gas and Electric Mark Sharp Pacific Gas and Electric Jim Gresham Westinghouse David Fink Westinghouse Kyler Gates* Westinghouse Mitch Nissley* Westinghouse Ann Marie DiLullo* Westinghouse Ali Fakhri* Westinghouse Sean Halfhill* Westinghouse Eric Benaquista* Westinghouse Mike Tronosky* Westinghouse Jane Jiang* Westinghouse Jim Andrachek* Westinghouse Dewey Olinskj* Westinghouse Dave Dunsavage* Westinghouse Dave Sklarsky* Westinghouse Bill Ruland U.S. Nuclear Regulatory Commission Chris Jackson U.S. Nuclear Regulatory Commission Paul Clifford U.S. Nuclear Regulatory Commission Ben Parks* U.S. Nuclear Regulatory Commission Andrew Proffitt U.S. Nuclear Regulatory Commission Neil O'Keefe* U.S. Nuclear Regulatory Commission (Region IV)
Louise Lund U.S. Nuclear Regulatory Commission Michael Markley U.S. Nuclear Regulatory Commission Jonathan Rowley U.S. Nuclear Regulatory Commission Joe Sebrosky U.S. Nuclear Regulatory Commission Leonard Willoughby* U.S. Nuclear Regulatory Commission (Region IV)
John Butler Nuclear Energy Institute J.A Savage* California Current
- partiCipated via telephone Enclosure
-4 Please direct any inquiries to me at 301-415-1132 or at Joseph.Sebroskv@nrc.gov.
I RN Joseph M. Sebrosky, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosures:
List of Attendees cc w/encl: Distribution via Listserv DISTRIBUTION~
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