05000305/FIN-2012004-05
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 CFR 50.65(a)(4) states, in part, that before performing maintenance activities (including but not limited to surveillance, post-maintenance testing, and corrective and preventive maintenance), the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities. Contrary to this, from 2006 until February 28, 2012, licensee failed to adequately assess risk on multiple occasions because ventilation damper TAV-82 was modeled as open in the licensees risk model instead of the actual position of closed. The open cross-connect damper was credited as providing cooling to the opposite trains 480-Volt safeguards bus during maintenance on the room coolers. When the risk model was corrected, the daily risk changed from green to red for various maintenance activities that been previously performed. The inspectors and Region III SRAs assessed risk using IMC 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process. The licensee calculated the combined incremental core damage probability deficit to be 8.7E-7 and the combined incremental large early release probability deficit to be 1.1E-7. The licensee also credited one risk management action. The inspectors and Region III SRAs independently reviewed the calculation and determined that the finding was of very low risk significance (Green). The licensee documented this violation in CR464332 and CR479176. The licensee took immediate corrective actions to update damper position in the daily risk model. |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2012004 Section 4OA7 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Winter K Riemer J Jandovitz R Krsek V Meghani K Barclay A Shaikh V Myers |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2012004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2012Q3
Self-Identified List (Kewaunee)
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