05000334/LER-2024-003, Unanalyzed Containment Bypass Condition Due to Degraded River Water Piping
| ML24185A033 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/02/2024 |
| From: | Blair B Vistra Operations Company |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-24-157 LER 2024-003-00 | |
| Download: ML24185A033 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 3342024003R00 - NRC Website | |
text
L-24-157 July 2, 2024 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 2024-003-00 Beaver Valley Power Station Barry N. Blair Site Vice President P.O. Box4 Shippingport, PA 15077 10 CFR 50.73 Enclosed is Licensee Event Report (LER) 2024-003-00, "Unanalyzed Containment Bypass Condition Due to Degraded River Water Piping." This event is being reported in accordance with 10 CFR 50.73(a)(2)(ii)(B), 10 CFR 50.73(a)(2)(i)(B),
10 CFR 50.73(a)(2)(ii)(A) and 10 CFR 50.73(a)(2)(v)(C).
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.
Sincerely,L
/(/1-f',q-p-Ji,s1-Barry N. Blair r,',S', SIFRfJA nmvF
Beaver Valley Power Station Unit No. 1 L-24-157 Page 2 Enclosure: Beaver Valley Power Station, Unit No. 1 LER 2024-003-00 cc: NRC Region I Administrator NRC Senior Resident Inspector NRC Project Manager INPO Records Center (via INPO Industry Reporting and Information System)
BRP/DEP
Enclosure L-24-157 Beaver Valley Power Station, Unit No. 1 LER 2024-003-00
Abstract
00334 3
05 09 2024 2024 003 00 07 03 2024 5
000 724-682-4224 E
BI PSP M120 Y
during the Beaver Valley Power Station, Unit No. 1 (BVPS-1) twenty-ninth refueling outage (1R29) ere during accident conditions is the degraded river water piping due to the river water piping not being monitored for through wall leaks The degraded "A" train river water piping was repaired and the "D" train river water piping was replaced. The degraded reactor plant river water piping was identified on May 8, 2024; however, an evaluation that determined that the degraded piping was reportable was completed on May 9, 2024.
a condition that resulted in its principal safety barrier being seriously degraded, 10 CFR 50.73(a)(2)(ii)(A),
and Page of
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
052 050
CAUSE OF THE EVENT
The degraded conditions were most likely caused by air/water interaction from the pipe being only partially full of water and from microbiological influenced corrosion (MIC).
The organization did not recognize the potential for degraded river water outlet piping to result in an unanalyzed condition and loss of safety function, therefore, there were no programmatic requirements in place to identify and prevent development of through-wall leaks in this piping.
ANALYSIS OF EVENT
This event is being reported as a condition that resulted in the plant being in a condition that resulted in its principal safety barrier being seriously degraded per 10 CFR 50.73(a)(2)(ii)(A), an unanalyzed condition that significantly degraded plant safety per 10 CFR 50.73(a)(2)(ii)(B), a condition prohibited by Technical Specifications per 10 CFR 50.73(a)(2)(i)(B), and a condition that could have prevented fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material per 10 CFR 50.73(a)(2)(v)(C).
The plant risk associated with the BVPS-1 degraded RS heat exchanger river water piping is considered to be very low significance. The core damage frequency and large early release frequency are both determined to remain unaffected by this condition.
CORRECTIVE ACTIONS
The degraded "A" train river water piping was repaired and the "D" train river water piping was replaced and returned to service May 15, 2024.
The station will establish a monitoring and replacement program for the Unit 1 RS heat exchanger river water outlet piping.
A teaching and learning case study will be developed with details regarding the unique configuration of the Unit 1 RS heat exchanger river water outlet piping.
PREVIOUS SIMILAR EVENTS
June 17, 2005 - Through wall leak discovered on B train river water header located upstream of the RS heat exchangers.
This leak was located outside of containment. The cause of this through wall leak was attributed to corrosion. The leak was repaired and river water B train returned to service.
October 22, 2019 - Pinhole leak discovered on the C RS heat exchanger river water outlet piping. The pinhole leak was attributed to MIC. The leak was repaired and returned to service.
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Beaver Valley Power Station, Unit 1 334 2024 003 00