ENS 41752
ENS Event | |
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16:25 Jun 7, 2005 | |
Title | Unanalyzed Potential Impact on Emergency Diesel Generator Operability |
Event Description | At 1125 on 6/7/2005 it was determined that the Emergency Diesel Generators A and B were out of service due to the possibility of Tornado Missiles potentially collapsing the D/G Fuel Oil Tank Vents. The Emergency Diesel Generators are required as a support system for RHR Decay Heat Removal and RHR was also declared inoperable at the same time. Technical Specification requirements for RHR Decay Heat Removal are, if less than the required number of heat sinks are operable, then corrective action shall be taken immediately to restore the minimum number to operable status. Actions are being taken to restore full operability of the Emergency Diesel Generators A and B.
Currently RHR is operating and providing decay heat removal and Emergency Diesel Generators are available as a support system for RHR. Event Report # 41528 had similar issues associated with the Emergency Diesel Generators exhaust ducts and their ability to withstand tornado forces. The licensee notified the NRC Resident Inspector.
Event Notice #41752 was initiated on 6/7/2005 to report an unanalyzed condition with the Emergency Diesel Generators A and B. The initial analysis for tornado missile strike probability results for the Emergency Diesel Generator fuel oil tank vent lines indicated they could be damaged by a tornado missile to the point they would potentially adversely affect Diesel operability. Additional analysis was performed and it was determined that the original fuel tank oil vent line configuration was acceptable. The licensee notified the NRC Resident Inspector. Notified R3DO (Mark Ring). |
Where | |
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Kewaunee ![]() Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-1.87 h-0.0779 days <br />-0.0111 weeks <br />-0.00256 months <br />) | |
Opened: | David Karst 14:33 Jun 7, 2005 |
NRC Officer: | Mike Ripley |
Last Updated: | Jul 26, 2005 |
41752 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Refueling Shutdown (0 %) |
After | Refueling Shutdown (0 %) |