05000352/FIN-2012004-03
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Finding | |
|---|---|
| Title | Inadequate Post Maintenance Testing Following Circuit Breaker Replacement |
| Description | A self-revealing NCV of TS 6.8, Procedures and Programs, was identified because Exelon did not maintain adequate maintenance procedures associated with work performed on the Unit 2 B residual heat removal (RHR) pump motor circuit breaker. Specifically, Exelon did not perform appropriate post maintenance testing following the replacement of the Unit 2 B RHR pump breaker on November 30, 2011. Despite the circuit breaker replacement affecting necessary pump support equipment operation due to circuit breaker dimensional differences, the procedure did not require a check to assure the support equipment was not adversely affected following the installation. As a result, the Unit 2 B RHR pump was inoperable for the low pressure coolant injection function when the pump was operating in the suppression pool cooling mode because the pumps minimum flow valve would not have opened automatically following the receipt of a loss of coolant accident signal. This condition existed from November 30, 2011 until the condition was corrected on June 27, 2012. This issue was entered into the Exelon CAP as IR 1381792. This self-revealing finding was determined to be more than minor because it is associated with the procedure quality attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was determined to be of very low safety significance (Green) because it did not represent a loss of system function and did not represent an actual loss of function for two separate safety systems out-of-service for greater than its TS Allowed Outage Time. The finding had a cross-cutting aspect in the area of Human Performance, Resources, because Exelon did not provide work packages with sufficient detailed instructions to assure nuclear safety |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2012004 Section 4OA2 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | E Burket E Dipaolo J Hawkins J Laughlin P Krohn R Nimitz |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Limerick - IR 05000352/2012004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2012Q3
Self-Identified List (Limerick)
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