ENS 46304
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ENS Event | |
|---|---|
14:11 Oct 2, 2010 | |
| Title | Residual Heat Removal System Piping Leak |
| Event Description | Approximately five hours after Beaver Valley Power Station Unit No. 1 was shutdown at 0011 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br /> [EDT] to enter a scheduled refueling outage, an approximate 5 drops per minute leak was identified from a drain valve on the Residual Heat Removal (RHR) System inside containment. This leak is downstream of the two series RHR isolation valves on a pipe which connects to both trains of RHR. The actual location of the leak on the valve was not immediately evident. An evaluation was requested. At 1011 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.846855e-4 months <br />, the evaluation reported a 270 degree circumferential crack in the socket weld on the RHR side of the valve. Without reasonable assurance of RHR System operability, both trains of RHR were declared inoperable. Both trains of the RHR System are currently in service, along with three steam generators/condenser remaining available for decay heat removal. Actions to address this condition are being pursued.
This is being reported as a condition that at the time of discovery could have prevented the fulfillment of the safety function of systems needed to remove decay heat pursuant to 10 CFR 50.72(b)(3)(v)(B) since both trains of RHR were declared inoperable. Beaver Valley Power Station Unit No. 2 is unaffected by this event and remains at 100 percent power. The NRC Resident Inspector has been notified. T.S. Action 3.4.7 requires that efforts be immediately initiated to restore RHR as soon as possible. |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| LER: | 05000334/LER-2010-002 |
| Time - Person (Reporting Time:+1.45 h0.0604 days <br />0.00863 weeks <br />0.00199 months <br />) | |
| Opened: | Dave Gibson 15:38 Oct 2, 2010 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Oct 2, 2010 |
| 46304 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
Beaver Valley with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
WEEKMONTHYEARENS 565692023-06-11T05:30:00011 June 2023 05:30:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition ENS 534192018-05-22T04:00:00022 May 2018 04:00:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown En Revision Imported Date 6/22/2018 ENS 463042010-10-02T14:11:0002 October 2010 14:11:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Residual Heat Removal System Piping Leak 2023-06-11T05:30:00 | |
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