ENS 47707
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ENS Event | |
|---|---|
21:44 Feb 28, 2012 | |
| Title | Unanalyzed Condition Related to Certain Postulated Fire Conditions |
| Event Description | At 1544 CST on February 28. 2012, it was identified that under certain fire conditions, the ability to meet the performance criteria of the approved Fire Protection Program may be challenged. Specifically the cabling within the Dedicated Fire Zone may be affected under certain fire conditions resulting in fire induced spurious operation of valves RC-46 (pressurizer/reactor head vent), PR-33A (pressurizer head vent) and RC-45A (reactor head vent). The ability to maintain pressurizer level within the indicated range may be challenged due to these spurious valve openings during these postulated conditions.
Contingency actions per the Fire Protection Program to address the fire in the area of concern have been established (hourly fire watch). This condition is reported pursuant to 10CFR50.72 (b)(3)(ii)(B). Similar conditions have been previously reported by the licensee in EN#44482 and EN#47686. The compensatory measures that had been put in place for those earlier conditions remain applicable to this current condition. The licensee notified the NRC Resident Inspector |
| Where | |
|---|---|
| Kewaunee Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| LER: | 05000305/LER-2012-001 Regarding Pressurizer PORV and Reactor Coolant System Vent Valves Appendix R Spurious Operation Concerns |
| Time - Person (Reporting Time:+-3.75 h-0.156 days <br />-0.0223 weeks <br />-0.00514 months <br />) | |
| Opened: | Joseph Stodola 17:59 Feb 28, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Feb 28, 2012 |
| 47707 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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