05000455/FIN-2008003-10
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | 10 CFR 50.65(a)(4) requires in part, that the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities before performing maintenance. Contrary to the above, between April 5, 2008 to April 6, 2008, the licensee failed to consider that both Unit 1 Essential Service Water Train Cross-tie Isolation Valves, 1SX033 and 1SX034, were left opened and unable to be closed in the main control room in their risk evaluation before conducting the 1A EDG testing. This finding affected the mitigating capability during an internal flooding event in the auxiliary building. The finding was determined to be of very low safety significance for Unit 1 because the unit had been shutdown since March 23, 2008, decay heat load was low, and the time to boil was long. The licensee entered this issue into their corrective action program as IR 759945 |
| Site: | Byron  |
|---|---|
| Report | IR 05000455/2008003 Section 4OA7 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Bartlett C Acosta C Thompson C Zoia D Jones J Cassidy J Jacobson N Feliz Adorno R Jickling R Ng R Russell R Skokowski T Bilik V Meghani |
| INPO aspect | |
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Finding - Byron - IR 05000455/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2008Q2
Self-Identified List (Byron)
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