ENS Event | |
|---|---|
11:00 Mar 10, 2006 | |
| Title | Failure of Emergency Exhaust System Dampers |
| Event Description | At 1050 CST on 3/09/2006 the Auxiliary Building ventilation isolation damper, GKD0129, failed a preventive maintenance stroke test as the result of dirt buildup on the damper vanes. The associated Technical Specification action statement, T/S 3.7.13.a, was entered. At 0500 CST on 3/10/2006 mechanical maintenance personnel observed a similar buildup condition on the redundant train damper, GKD0128, which is in series with GKD0129. At 0838 CST on 3/10/2006 approval was given by the Shift Manager to stroke closed GKD0128 to verify Operability. At 0951 CST 3/10/2006 mechanical maintenance personnel observed that GKD0128 damper vanes remained approximately 45 percent open. T/S 3.7.13.b action for two inoperable emergency exhaust system trains inoperable due to inoperable auxiliary building boundary was entered and back dated to 0500 CST 3/10/2006.
Having both trains of auxiliary building ventilation isolation dampers inoperable could prevent the ability to maintain the pressure boundary necessary to control the release of radioactive material. The licensee will notify the Resident Inspector. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+3.03 h0.126 days <br />0.018 weeks <br />0.00415 months <br />) | |
| Opened: | Keith Duncan 14:02 Mar 10, 2006 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Mar 10, 2006 |
| 42404 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 540612019-05-12T04:05:00012 May 2019 04:05:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Discovery of a Condition That Could Have Prevented Fulfillment of a Safety Function ENS 424042006-03-10T11:00:00010 March 2006 11:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Failure of Emergency Exhaust System Dampers ENS 422572006-01-13T14:30:00013 January 2006 14:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Pressurizer Porv Stroke Times Exceed Analysis Assumptions 2019-05-12T04:05:00 | |