05000282/FIN-2011003-11
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Section 50.65 (a)(iv) of Title 10 of the Code of Federal Regulations requires that licensees assess and manage the increase in risk that may result from proposed maintenance activities prior to performing maintenance. Contrary to the above, on May 10 and 11, 2011, the licensee failed to properly assess and manage the risk associated with the 12 diesel driven cooling water pump which was rendered unavailable when expanding a Unit 1 outage-related clearance order. This resulted in Unit 2 entering an unplanned orange risk condition. This issue was documented in CAPs 1282986 and 1285097. The licensee determined that this issue occurred because the risk model used by the work week managers and operations personnel had not been updated to reflect recent plant changes. Corrective actions included opening two valves, which restored cooling water supply to the pump, and ensuring personnel were aware of risk model changes that should be considered when performing risk assessments. The inspectors determined that the failure to properly assess plant risk in accordance with 10 CFR Part 50.65(a)(iv) was a performance deficiency that required an SDP evaluation. The inspectors consulted IMC 0609 to assess the impact on both the outage (Unit 1) and online (Unit 2) units. Specifically, Checklist 4 of Appendix G, Shutdown Operations, was utilized by inspectors to assess the impact on Unit 1. The inspectors concluded that all checklist attributes were met and Phase 2 or 3 evaluations were not required. Additionally, the redundancy in cooling water pumps available at the time of occurrence did not cause a risk change to Unit 1. For Unit 2, the inspectors utilized IMC 0609, Appendix K, Maintenance Rule Risk Assessment Significance Determination Process, and determined the risk deficit was not greater than 1E-06. Consequently, the inspectors concluded that this finding was of low safety significance (Green). |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2011003 Section 4OA7 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Jandovitz M Mitchell C Brown M Phalen K Stoedter D Betancourt J Corujo-Sandin E Sanchez N Feliz-Adorno S Lynch S Shah |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2011003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2011Q2
Self-Identified List (Prairie Island)
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