Letter Sequence Other |
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MONTHYEARML18352A7522018-12-14014 December 2018
Surveillance Capsule Test Results Report
Project stage: Request
ML19011A3332019-01-23023 January 2019
Extension of Schedule for Reporting Surveillance Capsule Test Results Under the Integrated Surveillance Program (EPRI Letter 2018-151)
Project stage: Other
2018-12-14
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Category:Letter
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[Table view] |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 23, 2019 Mr. Andrew McGehee BWRVIP Program Manager Electric Power Research Institute 3420 Hillview Avenue Palo Alto, CA 94304-1395 Mr. Bryan C. Hanson Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
PEACH BOTTOM ATOMIC POWER STATION, UNIT 2 - EXTENSION OF SCHEDULE FOR REPORTING SURVEILLANCE CAPSULE TEST RESULTS UNDER THE INTEGRATED SURVEILLANCE PROGRAM (EPRI LETTER 2018-151) (EPID L-2018-LLL-0034)
Dear Mr. McGehee and Mr. Hanson:
By letter dated December 14, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18352A752), the Boiling Water Reactor Vessels and Internals Project (BWRVIP) requested an extension in the reporting date for the results of the testing of the Peach Bottom Atomic Power Station (Peach Bottom), Unit 2, 30-degree reactor vessel material surveillance capsule as part of the BWR Integrated Surveillance Program (ISP), in accordance with Title 10 of the Code of Federal Regulations ( 10 CFR) Part 50, Appendix H, "Reactor Vessel Material Surveillance Program Requirements." Specifically, the extension would revise the submittal date for the report from October 22, 2019, to no later than April 30, 2020, to allow the BWRVIP additional time for placing contracts for performance of the testing and for the BWRVIP's committee review and approval process. The BWRVIP-requested extension date is approximately 1 year and 6 months after the date of capsule withdrawal. The regulation at 10 CFR Part 50, Appendix H, Section IV.A, states that the summary technical report must be submitted within 1 year of the date of capsule withdrawal, unless an extension is granted.
Electric Power Research Institute reports BWRVIP-86-A, "BWR Vessel and Internals Project, Updated BWR Integrated Surveillance Program (ISP) Implementation Program" (ADAMS Accession No. ML023190487), and BWRVIP-86, Revision 1-A, "BWR Vessel and Internals Project, Updated BWR Integrated Surveillance Program (ISP) Implementation Plan" (ADAMS Package Accession No. ML131760082), provide guidance for the establishment of an acceptable alternative to all existing BWR plant-specific reactor pressure vessel surveillance programs for the purpose of maintaining compliance with the requirements of Appendix H to 10 CFR Part 50 through the end of the current facility 40-year and 60-year extended operating licenses, respectively.
A. McGehee and B. Hanson As indicated in the U.S. Nuclear Regulatory Commission (NRC) safety evaluation dated February 1, 2002 (ADAMS Accession No. ML020380691 ), which was incorporated into BWRVIP-86-A "BWR Vessel and Internals Project, Updated BWR Integrated Surveillance Program (ISP) Implementation Program:
The BWRVIP shall submit any changes regarding the ISP testing matrix, withdrawal schedule, or testing and reporting of individual capsule results to the NRC for review and approval prior to implementing these changes.
Further, the BWRVIP will perform testing and submit surveillance capsule reports to the NRC in accordance with the provisions found in Appendix H to 10 CFR Part 50 on behalf of BWR licensees.
The 30-degree surveillance capsule was withdrawn from the Peach Bottom, Unit 2, reactor on October 22, 2018, in accordance with the BWRVIP ISP withdrawal schedule documented in BWRVIP-86, Revision 1-A. As part of an integrated surveillance program, the BWRVIP ISP capsule reports go through the BWRVIP's committee review process. This review process adds several months to the timeline for the completion and publication of the capsule summary technical report.
The BWRVIP request for extension, dated December 14, 2018, identified the current effective full-power years (EFPYs) and whether the target material would be affected by the availability of the capsule report. Amendment No. 316, dated November 15, 2017 (ADAMS Accession No. ML17286A013), for Peach Bottom, Unit 2, included pressure-temperature (P-T) limits curves for 53 EFPY of operation. The current EFPY for Peach Bottom, Unit 2, is approximately 33.7; therefore, the approved P-T limits curves will remain valid at least 18 years after the capsule report is completed, ensuring that adequate margins of safety exist for material fracture toughness of the Peach Bottom, Unit 2, reactor vessel. This means the current neutron fluence and thus level of embrittlement of the Peach Bottom, Unit 2 reactor vessel is less than the neutron fluence and level of embrittlement assumed in the P-T limits, which provides margin against the P-T limits becoming nonconservative as a result of the surveillance capsule testing results.
Thus, the 6-month extension to the report submittal date does not challenge the P-T margins of safety, nor does it delay the ability to determine embrittlement for other reactors in the ISP. The NRC staff concludes that extending the reporting of the results from the ISP surveillance capsule will not change the overall effectiveness of the ISP, nor will it affect the continued safe operation of Peach Bottom, Unit 2. Accordingly, the extension to April 30, 2020, for submittal of the Peach Bottom, Unit 2, 30-degree surveillance capsule summary technical report is acceptable.
Should you have further questions regarding implementation of the ISP, please contact the Peach Bottom Project Manager, Jennifer Tobin, at 301-415-2328 or Jennifer.Tobin@nrc.gov.
C0~
Jam's G. Danna, Chief Plant Licensing Branch 1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-277 cc: Listserv
ML19011A333 OFFICE DORL/LPL 1/PM DORULPL 1/LA DMLR/MVIB/BC DORULPL 1/BC NAME JTobin LRonewicz DAIiey JDanna DATE 01/14/2019 01/15/2019 01/20/2019 01/23/2019
