DCL-21-043, Report of Completion of Implementation of Risk-Informed Evaluation Methodology to Address Open Phase Condition

Report of Completion of Implementation of Risk-Informed Evaluation Methodology to Address Open Phase Condition

ML21140A441
Person / Time
Site:	Diablo Canyon
Issue date:	05/20/2021
From:	Gerfen P Pacific Gas & Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-21-043
Download: ML21140A441 (2)

Text

mPacHic Gas and Electric Company*

Paula Gerfen Site Vice President Diablo Canyon Power Plant Mail code 104/6/605 P.O. Box 56 Avila Beach, CA 93424 805.545.4596 Internal: 691.4596 Fax: 805.545.4234 PG&E Letter DCL-21-043 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units 1 and 2 Report of Completion of Implementation of Risk-Informed Evaluation Methodology to Address Open Phase Condition

References:

1. PG&E Letter DCL-20-108, Use of Risk-Informed Evaluation Methodology to Address Open Phase Condition, dated December 29, 2020 (ML20364A208)

2. Nuclear Energy Institute Open Phase Condition Initiative, Revision 3, dated June 2019 (transmitted to NRC under NEI letter dated June 6, 2019, Douglas E.

True to Ho Nieh, Jr., re: Industry Initiative on Open Phase Condition, Revision 3) (ML19163A176)

Dear Commissioners and Staff:

Reference 1 informed the NRC that Pacific Gas and Electric Company (PG&E) would implement the risk-informed evaluation methodology in Reference 2 to address potential open phase conditions at Diablo Canyon Power Plant (DCPP).

Implementation was completed on March 11, 2021, for DCPP Unit 1 and on April 5, 2021, for DCPP Unit 2.

Note that the Unit 2 implementation was delayed past the Reference 1 commitment date of March 31, 2021. This constitutes a change to the commitment; however, the delay was warranted to allow certain relay setpoint changes to be made safely during the spring refueling outage for that unit.

PG&E makes no new or other revisions to regulatory commitments (as defined by NEI 99-04) in this letter.

A member of the STARS Alliance Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek

Document Control Desk PG&E Letter DCL-21-043 Page 2 If you have any questions or require additional information, please contact Mr. Jim Morris, Regulatory Services Manager, at 805-545-4609.

Sincerely,

~~ro Paula Gerfen Site Vice President May 20, 2021 Date jmsp/50601137-12 cc: Donald R. Krause, NRC Senior Resident Inspector Samson S. Lee, NRC Project Manager Scott A. Morris, NRC Region IV Administrator Diablo Canyon Distribution A member of the STARS Alliance Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek