ENS 43675

v t e ENS Event
21:00 Sep 28, 2007
Title	Reactor Vessel Head Vent May Not Be Isolable During a Fire
Event Description	Plant engineering determined that in a postulated fire in the Control Room or Cable Spreading Room which required Control Room evacuation, that "hot shorts" may prevent the reactor vessel head vents from performing their emergency functions in accordance with the plant Emergency Operating Procedures (EOPs). Several relays in the letdown system are not isolated at the Auxiliary Shutdown Panel and have the potential for shorting during a fire. This letdown path can be aligned from the reactor vessel head vents during certain EOP scenarios. The affected reactor vessel head vent isolation transfer switches are: 3RCSSV8095A & B and 3RCSSV8096A & B. The site has implemented an hourly fire watch in the affected areas. The licensee notified the NRC Resident Inspector.

ENS 43675 +/-
Where
Millstone Connecticut (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+-2.25 h-0.0938 days <br />-0.0134 weeks <br />-0.00308 months <br />)
Opened:	Brien Strizzi 18:45 Sep 28, 2007
NRC Officer:	Mark Abramovitz
Last Updated:	Sep 28, 2007
43675 - NRC Website
v • d • e

v t e Emergency Notification System
Millstone with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2023-07-06T16:32:00 [Table view]
[ENS list for Millstone]

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