ENS 40774
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ENS Event | |
|---|---|
19:00 May 24, 2004 | |
| Title | Degraded Condition Due To Emergency Service Water Failure |
| Event Description | Emergency Service Water "A" (ESW ) Pump failure resulted in inoperability of all Div 1 ECCS systems at 0150 on 05/21/04 [See event notification 40767]. A plant shutdown was initiated with mode 4 [cold shutdown] achieved at 0619 on 05/23/04. During the disassembly and inspection of ESW A pump, a failed coupling on the pump shaft was found to be the cause of the failure. An Operability Determination [OD] was requested on ESW B at 1330 on 05/24/04 since both pumps had the identical coupling design and the pumps had similar run times. At 1500, the Design Engineering Manager informed the control room that engineering could not return a completed OD within the allotted time that could justify continued ESW B operability. The control room Shift Manager than declared the ESW B pump inoperable. This results in a condition that could have prevented the fulfillment of a safety function, specifically the removal of residual heat.
The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| LER: | 05000440/LER-2004-001 |
| Time - Person (Reporting Time:+-1.8 h-0.075 days <br />-0.0107 weeks <br />-0.00247 months <br />) | |
| Opened: | Jim Case 17:12 May 24, 2004 |
| NRC Officer: | Bill Gott |
| Last Updated: | May 24, 2004 |
| 40774 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
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