ENS 44672
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ENS Event | |
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21:57 Nov 20, 2008 | |
Title | Unexpected High Pressure Coolant Injection Isolation During Test |
Event Description | The High Pressure Coolant Injection (HPCI) system was declared inoperable on 11/20/08 at 1657 EST due to a Group 4 isolation signal generated during scheduled surveillance testing in accordance with PNPS [Pilgrim Nuclear Power Station] Procedure 8.M.2-2.5.3, Attachment 1. The HPCI testing was stopped to determine the cause of the isolation which was not part of the planned evolution. HPCI isolation was reset and HPCI was restored to standby lineup at 1804 EST. This event is an eight-hour notification. Efforts are ongoing to determine the cause of the error during testing.
This event had no adverse effect to the health and/or safety of the public. The licensee has notified the NRC Resident Inspector of this event. This notification is being made in accordance with 10 CFR 50.72(b)(3)(v)(D) due to the loss of a single train system required to mitigate the consequences of an accident. |
Where | |
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Pilgrim Massachusetts (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000293/LER-2008-005 |
Time - Person (Reporting Time:+-0.6 h-0.025 days <br />-0.00357 weeks <br />-8.2188e-4 months <br />) | |
Opened: | John Whalley 21:21 Nov 20, 2008 |
NRC Officer: | Howie Crouch |
Last Updated: | Nov 20, 2008 |
44672 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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