ENS 46063
ENS Event | |
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16:07 Oct 13, 2009 | |
Title | Historic Condition with Containment Cooler Fan Relays |
Event Description | [This is a] historical condition previously reported in LER 2009-001 [that] should also have been reported in accordance with 10 CFR 50.72(b)(3)(v)(D).
Due to misapplication of Potter and Brumfield Rotary Relays, both operating Containment Air Cooler Fans were declared inoperable on October 13, 2009, and the fans switched from their normal fast speed alignment to the slow speed alignment used for accidents, which eliminated the relay issue and allowed them to be declared operable. This issue was reported in LER 2009-001 as an operation prohibited by the Technical Specifications on December 14, 2009. The fan control circuitry was modified to correct the condition. Upon further review, this condition should have been reported per the requirements of 10 CFR 50.72(b)(3)(v)(D) due to both required Containment Air Cooler Fan trains being declared inoperable for the condition. A revision to LER 2009-001 will be submitted per 10 CFR 50.73(a)(2)(v)(D). The NRC Senior Resident Inspector has been notified. |
Where | |
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Davis Besse Ohio (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+6261.85 h260.91 days <br />37.273 weeks <br />8.577 months <br />) | |
Opened: | Tom Kobbledick 13:58 Jul 1, 2010 |
NRC Officer: | Pete Snyder |
Last Updated: | Jul 1, 2010 |
46063 - 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 %) |