ENS Event | |
|---|---|
18:00 Jun 12, 2006 | |
| Title | Manual Actions Determined Untimely for Fire Safe Shutdown |
| Event Description | As part of an analysis to determine feasibility of manual actions, it was identified that three actions for Fire Area RAB 7 could not be performed within the times prescribed in the Post Shutdown Analysis. The subject fire area is subdivided by part height fire walls. Waterford 3 has an approved Appendix R deviation for the part height fire wall configuration.
Assuming a fire in Fire Area RAB 7 Operator entry into that same fire area is required. Results of the analysis indicate that the conditions in Fire Zone RAB 7B rapidly exceed the habitability threshold and do not moderate before ten minutes, the time at which one of the three manual actions is required, given a fire in Fire Zone RAB 7A. Because the space becomes uninhabitable, the manual action in Fire Zone RAB 7A is not feasible. A continuous fire watch has been established within Fire Area RAB 7 as a compensatory measure. This condition is reportable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> pursuant to 10CFR 50.72(b)(3)(v)(A) as an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to shut down the reactor and maintain it in a safe shutdown condition. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Waterford  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| Time - Person (Reporting Time:+3.55 h0.148 days <br />0.0211 weeks <br />0.00486 months <br />) | |
| Opened: | Oscar Pipkins 21:33 Jun 12, 2006 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jun 12, 2006 |
| 42636 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |