L-25-189, Submittal of Post Accident Monitor Report
| ML25282A001 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/08/2025 |
| From: | Blair B Vistra Operations Company |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-25-189 | |
| Download: ML25282A001 (1) | |
Text
L-25-189 October 8, 2025 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
Beaver Valley Power Station, Unit No. 2 BV-2 Docket No. 50-412, License No. NPF-73 Post Accident Monitor Report Beaver Valley Power Station Barry N. Blair Site Vice President P.O. Box4 Shippingport, PA 15077 10 CFR 50.73 The attached report is submitted in accordance with Beaver Valley Power Station, Unit No. 2 (BVPS-2) Technical Specifications 3.3.3 and 5.6.5. This report is required due to the inoperability of a BVPS Unit No. 2 Containment Wide Range Pressure Indication for a period in excess of the 30 day restoration time.
There are no regulatory commitments contained in this submittal. If there are any questions or if additional information is required, please contact Ms. Hope Gilliam, Manager, Regulatory Compliance, at 724-682-4224.
Barry N. Blair VIS [RACl)PPCOM
Beaver Valley Power Station, Unit Nos. 2 L-25-189 Page 2
Attachment:
Beaver Valley Power Station Unit 2 Post Accident Monitor Report cc:
NRC Region I Administrator NRC Senior Resident Inspector NRC Project Manager BRP / DEP
Attachment L-25-189 Beaver Valley Power Station Unit 2 Post Accident Monitor Report Page 1 of 2 This Report is being submitted for Beaver Valley Power Station, Unit No. 2 (BVPS-2) per Technical Specification (TS) 5.6.5, Post Accident Monitoring Report. TS 3.3.3, Post Accident Monitoring (PAM)
Instrumentation requires that two channels of Containment Wide Range Pressure indication be operable during plant operation in Modes 1, 2, and 3. On August 29, 2025, one channel, 2LMS-PT106B, was declared inoperable and TS 3.3.3 Condition A was entered. TS 3.3.3 Condition A requires channel restoration to operable status in 30 days. If TS 3.3.3 A is not satisfied in 30 days, then TS 3.3.3 Condition B is entered. Beaver Valley has determined that the Containment Wide Range instrument cannot be restored in the 30 days; therefore, TS 3.3.3 Condition B requires initiation of action in accordance with TS 5.6.5. This TS administrative reporting requirement requires a report to be submitted within the following 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the instrumentation channels of the function to operable status.
Description of Issue On August 29, 2025, the plant safety monitoring system (PSMS) indicated channel 2 bad status. PSMS displayed a "NO" for remote processing unit (RPU) channel 2 status. 2MSS-SV102A, 2MSS-SV104A, 2MSS-SV102B, 2MSS-SV103B, 2MSS-SV104B, 2MSS-SV102C, 2MSS-SV104, 2LMS-PT-106B, N52B, and other computer points associated with channel indicated bad. It was noted that PNL-2RPU-B, PSMS Process PNL had all lights on and appeared to have power. The -12v LED was dimmer than the rest but not suspected to be the cause. This issue is documented in CR-2025-06144.
Cause of the Inoperability and Action Taken PSMS PNL-2RPU-B channel 2 processes the input from the transmitter for display on PSMS data processing unit (DPU) A, PSMS DPU B, and computer point P0102A. Due to a fault on PSMS 2RPU-B channel 2, all three indications for this channel are not available. With no indication for 2LMS-PT106B, the channel was declared inoperable per the requirements of TS 3.3.3. Resolution of the 2RPU-B channel 2 issue is required to restore channel to operable status. The communication circuit card associated with the channel was replaced without success due to not being compatible with the system.
6555 SIERRA DRIVE IRVING, TEXAS 75039 o 214-812-4600 VISTRACORP.COM
Attachment L-25-189 Beaver Valley Power Station Unit 2 Post Accident Monitor Report Page 2 of 2 Preplanned Alternate Method of Monitoring With 2LMS-PT106B out of service, the remaining PAM containment pressure instrument, 2LMS-PT106A, remained in service and the monitored channel for accident conditions. In addition, the control room has 4 additional safety related containment pressure transmitters which remained available for monitoring Containment Pressure, 2LMS-PT950, 2LMS-PT951, 2LMS-PT952, and 2LMS-PT953. These Instruments provide input into the Solid State Protection System for Safety Injection, Main Steam Isolation, and Containment Isolation Phase B, with the only difference for these channels being that 2LMS-PT106B reads in PSIA and 2LMS-PT950, -951, -952, -953 read in PSIG. Furthermore, 2LMS-PT950 and 2LMS-PT951 have additional monitoring on recorder 2LMS-PR950.
Plan and Schedule for Restoring the Instrumentation Channel A new communication circuit card was obtained and verified to be compatible with the PSMS system.
On October 1, 2025 the communication circuit card was replaced, restoring PSMS channel 2.
Restoring PSMS channel 2 restored indication for 2LMS-PT106B and subsequently returned the equipment to operable status. BVPS-2 exited LCO 3.3.3 Condition A.