ENS 43525
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ENS Event | |
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14:02 Jul 26, 2007 | |
Title | Unanalyzed Condition - Flood Doors Closed Causing a Potential Loss of Both Vital Switchgear |
Event Description | At 09:02 on 07/28/07, an outplant operator identified that DOOR-18, which is a normally open fire door, had closed due to a failed fusible link. With this door closed, the pathway for a potential flood due to a high energy line break (HELB) is blocked therefore closing off a drain path for the water. This represented an unanalyzed condition where both divisions of essential switchgear could be impacted. As a result, both divisions of essential switchgear were declared inoperable and Technical Specification LCO 3.0.3 was entered. At 09:55 on 07/26/07, the closed fire door was restored to the open state. Both divisions of switchgear were declared Operable and LCO 3.0.3 was exited. No system actuations occurred as a part of this event.
The licensee notified the NRC Resident Inspector. |
Where | |
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Monticello Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+2.5 h0.104 days <br />0.0149 weeks <br />0.00342 months <br />) | |
Opened: | Randy Sand 16:32 Jul 26, 2007 |
NRC Officer: | Joe O'Hara |
Last Updated: | Jul 26, 2007 |
43525 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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