ENS 47492
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ENS Event | |
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22:47 Nov 30, 2011 | |
Title | |
Event Description | On November 30, 2011, at 1747 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.647335e-4 months <br /> [EST], with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) declared the High Pressure Coolant Injection (HPCI) system inoperable due to the HPCI turbine control valve (HPCI-24) failing to go open during planned post-maintenance testing. The HPCI-24 is a hydraulically operated control valve and its normal position is closed. The HPCI-24 valve has a safety function to open on a demand signal during certain event mitigation scenarios requiring the HPCI system operation.
Based on the turbine control valve failing to open during post-maintenance testing and a subsequent check out run per PNPS Procedure 8.5.4.1, the HPCI system was declared inoperable at 1747 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.647335e-4 months <br /> and the appropriate LCO was entered. An investigation of the event is underway and continuing. This event had no impact on the health and/or safety of the public. The NRC Resident Inspector bas been notified. This is an 8-hour notification made in accordance with 50.72(b)(3)(v)(D). |
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 | |
Time - Person (Reporting Time:+-0.63 h-0.0263 days <br />-0.00375 weeks <br />-8.62974e-4 months <br />) | |
Opened: | Ken Gracia 22:09 Nov 30, 2011 |
NRC Officer: | Bill Huffman |
Last Updated: | Nov 30, 2011 |
47492 - 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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