ML23065A109

Correction of Relief Request HNP-ISI-RR-05-02 Allowing to Continue Operation with a Flaw Indication on One Reactor Pressure Vessel Closure Bolt Until December 31, 2025

ML23065A109
Person / Time
Site:	Hatch
Issue date:	03/08/2023
From:	John Lamb NRC/NRR/DORL/LPL2-1
To:	Brown R Southern Nuclear Operating Co
References
EPID L-2022-LLL-0018
Download: ML23065A109 (1)

Text

March 8, 2023 Mr. R. Keith Brown Regulatory Affairs Director Southern Nuclear Operating Co., Inc.

3535 Colonnade Parkway Birmingham, AL 35243

SUBJECT:

EDWIN I. HATCH NUCLEAR PLANT, UNIT 2 - CORRECTION OF RELIEF REQUEST HNP-ISI-RR-05-02 ALLOWING TO CONTINUE OPERATION WITH A FLAW INDICATION ON ONE REACTOR PRESSURE VESSEL CLOSURE BOLT UNTIL DECEMBER 31, 2025 (EPID L-2022-LLL-0018)

Dear Mr. Brown:

By letter dated February 6, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19035A550), the U.S. Nuclear Regulatory Commission (NRC) authorized a relief request HNP-ISI-RR-05-02 for Edwin I. Hatch Nuclear Plant (Hatch), Unit 2.

The NRC authorized relief to Southern Nuclear Operating Company (SNC, the licensee) to continue operation of Hatch Nuclear Plant, Unit 2, with a flaw indication on reactor pressure vessel (RPV) closure bolt #33 on the basis of impracticality.

By letter dated October 27, 2022 (ML22300A259), Southern Nuclear Operating Company (SNC, the licensee) submitted a supplement to alternative request HNP-ISI-RR-05-02, to inform the NRC that the licensee discovered an error in two inputs to its evaluation report C-3944-00-01, Revision 0. The licensee described the input error, assessed its impact on alternative request HNP-ISI-RR-05-02, and included Revision 1 of C-3944-00-01 that reflects the changes to the two inputs. SNC stated that the conclusions in C-3944-00-01, Revision 1, remain the same as those in C-3944-00-01, Revision 0.

The NRC staff reviewed the two inputs that were in error in C-3944-00-01, Revision 0, and the licensees assessment of the impact of the error on HNP-ISI-RR-05-02. The NRC staff noted that the two inputs were isolated values that were incorrectly taken from the source report.

Based on its independent review, the NRC staff determined that the two input errors do not invalidate the basis for the NRCs 2019 authorization of HNP-ISI-RR-05-02. The corrected inputs applied to the licensees calculations resulted in stress values that remain below the American Society of Mechanical of Mechanical Engineers Code allowable stress values.

Therefore, the NRC staff concludes that alternative request HNP-ISI-RR-05-02 remains valid for the current in-service inspection interval that ends December 31, 2025.

R. K. Brown If you have any questions, please contact me at 301-415-3100 or John.Lamb@nrc.gov.

Sincerely,

/RA/

John G. Lamb, Senior Project Manager for Dawnmathews Kalathiveettil, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos.: 50-321 and 50-366

Enclosure:

As stated cc: Listserv

ML23065A109 OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1/LA NRR/DNRL/NVIB (A)

NAME JLamb (for DKalathiveettil) KGoldstein DWidrevitz DATE 03/062023 03/06/2023 01/09/2023 OFFICE NRR/DORL/LPL2-1/BC NRR/DORL/LPL2-1/PM NAME MMarkley JLamb DATE 03/07/2023 03/08/2023