ENS 50711
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ENS Event | |
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18:05 Dec 31, 2014 | |
Title | Through Wall Seepage Affecting Rhr System |
Event Description | At 1105 PST, plant personnel identified through-wall seepage in a Diablo Canyon Power Plant Unit 1 socket weld inside containment that provides a flow path to a relief valve protecting a common portion of both trains of the Residual Heat Removal (RHR) System. The as-found condition falls under the requirements of the ASME acceptance criteria. Unit 1 was already in Mode 3, or offline, due to a planned maintenance outage. PG&E accordingly declared both Unit 1 trains of RHR inoperable and has initiated a transition from Mode 3 to Mode 4 in accordance with requirements of Technical Specification 3.0.3.
The licensee notified the NRC Resident Inspector. |
Where | |
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Diablo Canyon ![]() California (NRC Region 4) | |
Reporting | |
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 | |
LER: | 05000275/LER-2015-001 05000275/LER-2015-001 Both Trains of Residual Heat Removal Inoperable Due to Circumferential Crack on a Socket Weld |
Time - Person (Reporting Time:+2.65 h0.11 days <br />0.0158 weeks <br />0.00363 months <br />) | |
Opened: | Jeremy Cobbs 20:44 Dec 31, 2014 |
NRC Officer: | Daniel Mills |
Last Updated: | Dec 31, 2014 |
50711 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
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