ENS 43525

v t e ENS Event
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.

ENS 43525 +/-
Where
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
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v • d • e

v t e Emergency Notification System
Monticello with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2024-11-15T19:05:00 [Table view]
[ENS list for Monticello]

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