ENS 48215
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ENS Event | |
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04:38 Aug 21, 2012 | |
Title | |
Event Description | At 0038 EDT on 08/21/12, EDG "A" was declared inoperable after the Engineered Safeguards Actuation System (ESFAS) fuse failed . EDG "B" had been inoperable for planned maintenance since 2223 EDT on 08/15/12. With both EDGs inoperable, Unit 2 entered Tech Spec LCO 3.8.1.2 which requires suspension of all operations involving core alteration and positive reactivity additions.
At 0713 EDT on 08/21/12, the licensee declared EDG "B" Operable exiting the Tech Spec LCO. The cause of the ESFAS fuse failure on EDG "A" is under investigation. The licensee will notify state and local agencies and has informed the NRC Resident Inspector.
The purpose of this call is to retract the report made on 8/21/2012, Event Number 48215. Upon further review, the fuse failure did not render the 'A' Emergency Diesel Generator (EDG) inoperable in MODE 5. If called upon, the safety functions would have been met. The Engineered Safeguards Actuation System (ESFAS) was repaired prior to restart of the unit. Notified R1DO (Conte). |
Where | |
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Millstone Connecticut (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:+3.2 h0.133 days <br />0.019 weeks <br />0.00438 months <br />) | |
Opened: | Kenneth Hajnal 07:50 Aug 21, 2012 |
NRC Officer: | Steve Sandin |
Last Updated: | Sep 4, 2012 |
48215 - NRC Website
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Unit 2 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
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