ML25097A020
| ML25097A020 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 04/03/2025 |
| From: | Jenkins B Dominion Energy South Carolina |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 25-111, 2025-003 | |
| Download: ML25097A020 (1) | |
Text
Dominion Energy South Carolina, Inc Virgil C. Summer Nuclear Station Bradham Boulevard & Highway 215, Jenkinsville, SC 29065 Mailing Address:
P.O. Box 88, Jenkinsville, SC 29065 DominionEnergy.com Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 April 3, 2025 DOMINION ENERGY SOUTH CAROLINA
~
Dominion p,- Energy Serial No.25-111 VCS LIC/JB/Rev 0 Docket No. 50-395 License No. NPF-12 VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 (VCSNS)
SPECIAL REPORT 2025-003 INOPERABLE RADIATION MONITORING INSTRUMENTATION CHANNEL Dominion Energy South Carolina, Inc. (DESC) hereby submits Special Report 2025-003, pursuant to the requirements of Technical Specification (TS) 6.9.2, as required by Action 30 of TS 3.3.3.1.b, Table 3.3-6, RADIATION MONITORING INSTRUMENTATION, Item 2.d.i.
The Main Plant Vent Radiation Monitor, RM-A 13, was declared inoperable on March 24, 2025, due to spurious spikes and alarms. RM-A 13 provides extended range backup radiation monitoring to the RM-A3 functions for the Main Plant Vent described in Final Safety Analysis Report (FSAR) Section 9.4.2, Auxiliary and Radwaste Area Ventilation System. RM-A 13 is described in FSAR 11.4, Process and Effluent Radiological Monitoring Systems, and its associated tables and figures, as well as Table 12.2-3 and Figure 12.2-2.
Upon declaring RM-A 13 inoperable, VCSNS implemented a preplanned alternate method of monitoring in accordance with the requirements of Action 30 of TS Table 3.3-6.
Troubleshooting determined that detector terminals on RM-A 13 required cleaning and adjustment. VCSNS expects to complete repairs and restore the operability of RM-A 13 by April 30, 2025.
This issue appears to be unrelated to RM-A 13 maintenance completed in February 2025, which required replacement of the detector and amplifier to address an instrument trouble alarm.
Should you have any questions, please call Justin Bouknight at (803) 941-9828.
Sincerely,
~c~
Beth JeniQ~ -
Site Vice President V.C. Summer Nuclear Station Commitments contained in this letter: None cc:
G. J. Lindamood - Santee Cooper L. Dudes - NRC Region 11 G. Miller - NRC Project Mgr NRC Resident Inspector Marsh USA, Inc.