ENS 43098

v t e ENS Event
21:31 Jan 12, 2007
Title	Unanalyzed Condition of Decay Heat System
Event Description	Crystal River Unit 3 has determined that an existing condition in the Decay Heat (DH) System is reportable under 10 CFR.50.72 (b)(3)(ii)(B), an Unanalyzed Condition. Two valves in question are in series in the Decay Heat (DH) System drop leg from the Reactor Coolant System (RCS). These valves are High-Low pressure interface valves, where three phase hot shorts from another power cable must be considered under Appendix R. A review of cable routing concluded that the two valve's power cables do not meet required Appendix R separation or protection criteria. As such, there is a low probability that both valves could open due to hot shorts under normal operating RCS pressure and temperature conditions, resulting in a rupture of the downstream piping in the Reactor Building or Auxiliary Building. This event could result in a Loss of Coolant Accident (LOCA) in the Auxiliary Building, which is an unanalyzed condition. The licensee will notify the NRC Resident Inspector.

ENS 43098 +/-
Where
Crystal River Florida (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+-4.2 h-0.175 days <br />-0.025 weeks <br />-0.00575 months <br />)
Opened:	Eddie Riffle 17:19 Jan 12, 2007
NRC Officer:	John Knoke
Last Updated:	Jan 12, 2007
43098 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Crystal River with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2007-01-23T20:15:00 [Table view]
[ENS list for Crystal River]

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