ENS 48122
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ENS Event | |
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19:00 Jul 20, 2012 | |
Title | Unit 2 Emergency Diesel Generators Inoperable Due to Missing Flood Control Barrier Seal |
Event Description | D5 and D6 Diesel Generators (DG) were declared inoperable at 1400 CDT due to a missing internal flood control barrier seal. The missing flood control barrier seal is required to be installed with Unit 2 in Modes 1, 2, 3, and 4 when the MSIV's are open.
LCO 3.8.1 Condition B was entered for both DGs and LCO 3.8.1 Condition E was entered for two DGs inoperable on the same unit. The DGs could start and run if required at the time of entry. This condition is reportable per 10CFR50.72(b)(3)(v) as an event or condition that could have prevented the fulfillment of a safety function. At 1505 CDT the missing internal flood barrier seal was verified in place restoring the safety function. LCO 3.8.1 Condition B and E were exited. The NRC Resident Inspector has been informed. At this time, it is not known how long the seals had been missing. An investigation is on-going. |
Where | |
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Prairie Island ![]() Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
Time - Person (Reporting Time:+-2.08 h-0.0867 days <br />-0.0124 weeks <br />-0.00285 months <br />) | |
Opened: | Stever Schmidt 16:55 Jul 20, 2012 |
NRC Officer: | Donald Norwood |
Last Updated: | Jul 20, 2012 |
48122 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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