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. |
| 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
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 431162007-01-23T20:15:00023 January 2007 20:15:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition ENS 430982007-01-12T21:31:00012 January 2007 21:31:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition of Decay Heat System ENS 413622005-01-27T23:30:00027 January 2005 23:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Single Failure Identified That Could Prevent Re-Energizing Both Es Busses 2007-01-23T20:15:00 | |