ML24178A119
| ML24178A119 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/25/2024 |
| From: | James Holloway Dominion Energy South Carolina |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 23-177B | |
| Download: ML24178A119 (1) | |
Text
Dominion Energy South Carolina, Inc.
5000 Dominion Boulevard. Glen Allen. VA 23060 DominionEnergy.com June 25, 2024 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-001 DOMINION ENERGY SOUTH CAROLINA, INC.
VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 Serial No.:
NRA/AF:
Dominion Energy' Docket No.:
23-177B R2 50-395 NPF-12 License No.:
UPDATE TO LICENSE AMENDMENT REQUEST-INVERTER ALLOWED OUTAGE TIME (AOT} EXTENSION By letter dated November 9, 2023 [Agencywide Documents Access and Management System (ADAMS) Accession No. ML23317A224], Dominion Energy South Carolina, Inc.
(DESC) submitted a license amendment request (LAR) for Virgil C. Summer Nuclear Station (VCSNS) Unit 1. The purpose of the request was to modify VCSNS Technical Specification (TS) Limiting Condition for Operations (LCO) 3.8.3.1, Action C, concerning inoperable Alternating Current (AC.) Inverters, which are addressed in TS Section 3/4.8.3, Onsite Power Distribution.
A call was held with the NRC on May 29, 2024 to provide clarifying information concerning the alternate A.C. power source for the vital AC. instrument buses APN5901, 2, 3 and 4-EV. During the discussion, two questions were discussed concerning whether the alternate source was regulated or non-regulated and whether the source of power was from Balance of Plant (BOP) or Engineered Safety Feature (ESF). After further review, DESC determined that the information provided was overly specific and a correction to the last paragraph on page 4 of 29 of the LAR submittal is necessary to clarify this detail.
The marked-up original LAR text indicating the proposed wording change is provided in the left-hand column of the table below, and the revised text is provided in the right-hand column.
Serial No.: 23-1778 Docket No.: 50-395 Page 2 of 3 Marked-up Original LAR Text Revised Text Only one of the four Vital A.C. Instrument Only one of the four vital A.C. instrument Susses APN5901, 2, 3 or 4-EV can be Busses APN5901, 2, 3 or 4-EV can be energized via the non regulated alternate energized via the alternate power supply source BOP instrument power supply at at any time in accordance with TS Section any time in accordance with TS Section 3/4.8.3. Therefore, a minimum of three (3) 3/4.8.3. Therefore, a minimum of three (3) out of the four (4) redundant channels of out of the four (4) redundant channels of NSSS and BOP instrumentation are NSSS and BOP instrumentation are provided with an uninterruptible source of provided with an regulated uninterruptible power for monitoring and actuating the source of power for monitoring and Reactor Protection System. This limitation actuating the Reactor Protection System. ensures vital A.C. system availability and This limitation ensures vital A.C. system NSSS instrument operability.
availability and NSSS instrument operability.
If there are any questions regarding this submittal or if additional information is needed, please contact Mr. Allen Fulmer at (803) 543-2501.
Respectfully, Ja2::ay Vice President - Nuclear Engineering and Fleet Support Commitments made in this letter:
None COMMONWEAL TH OF VIRGINIA
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COUNTY OF HENRICO
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The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by James E. Holloway, who is Vice President - Nuclear Engineering and Fleet Support of Dominion Energy South Carolina, Inc. He has affirmed before me that he is duly authorized to execute and file the foregoing document on behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.
ti.
Acknowledged before me this~ day of ~une..
, 2024.
My Comm;ssion E><pire<,, o,.,.s t 3 I J 2o 2.. 7 GARY DON MILLER Notary Public Commonwealth of Virginia Reg.# 7629412 My Commission Expires August 31, 2<Z.}
cc:
U.S. Nuclear Regulatory Commission, Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, Georgia 30303-1257 NRG Senior Resident Inspector Virgil C. Summer Nuclear Station Mr. G. Edward Miller NRG Senior Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop O-9E3 11555 Rockville Pike Rockville, Maryland 20852-2738 Mr. Nate Guthier Bureau of Environmental Health Services Serial No.: 23-177B Docket No.: 50-395 Page 3 of 3 South Carolina Department of Health and Environmental Control 8500 Farrow Road - Building 17 Columbia, SC 29203 Mr. Gregory Lindamood Santee Cooper - Nuclear Coordinator 1 Riverwood Driver Moncks Corner, SC 29461