ENS Event | |
|---|---|
20:15 Jan 23, 2007 | |
| Title | |
| Event Description | Crystal River 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 DH System drop leg from the Reactor Coolant System (RCS). They are Appendix R High-Low pressure interface valves, where 3 phase hot shorts from another power cable must be considered. A review of cable routing concluded that one of the valve's power cables and one of the valve's control power cables do not meet required separation criteria. There is a low probability that both could open due to hot shorts under normal operating RCS pressure and temperature conditions, therefore a rupture of the downstream piping in the Reactor Building or Auxiliary Building is possible. The postulated event is a Loss of Coolant Accident (LOCA) in the Auxiliary Building, which is an unanalyzed condition. This condition is similar to the one reported in EN 43098 on 01/12/2007. Cables in question are for the same valves, however, they are in a different area of the plant.
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 | |
| LER: | 05000302/LER-2007-001 |
| Time - Person (Reporting Time:+-3.8 h-0.158 days <br />-0.0226 weeks <br />-0.00521 months <br />) | |
| Opened: | David Mcagy 16:27 Jan 23, 2007 |
| NRC Officer: | Bill Gott |
| Last Updated: | Jan 23, 2007 |
| 43116 - 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 | |