ENS 47871
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ENS Event | |
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22:42 Apr 27, 2012 | |
Title | Both Trains of Residual Heat Removal Declared Inoperable |
Event Description | At 1742 EDT on 04/27/2012, while in Mode 5, both trains of RHR (Residual Heat Removal) were declared inoperable due to a through wall leak on a socket welded connection of ASME code class piping. Currently, with both trains of RHR in service for decay heat removal, the leakage impacts redundant equipment required to fulfill a safety function. In the current condition, both trains are required to be operable to meet Technical Specification [TS] 3.4.7, 'RCS Loops - MODE 5, Loops Filled'.
The leakage is isolable from the reactor coolant system and is therefore not considered RCS pressure boundary leakage per LCO 3.4.13, 'RCS Operational Leakage'. This event is being reported under 50.72(b)(3)(v)(B), 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: (B) remove residual heat'. Action has been initiated in accordance with TS 3.4.7 required action C.2 to restore one RHR loop to operable status. The licensee is performing engineering analysis to determine the most appropriate repair method. The licensee has notified the NRC Resident Inspector. |
Where | |
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Kewaunee Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
Time - Person (Reporting Time:+-0.32 h-0.0133 days <br />-0.0019 weeks <br />-4.38336e-4 months <br />) | |
Opened: | Logan Miller 22:23 Apr 27, 2012 |
NRC Officer: | Howie Crouch |
Last Updated: | Apr 27, 2012 |
47871 - NRC Website | |
Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
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