05000352/FIN-2010004-03
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Finding | |
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| Title | |
| Description | The inspectors identified a Green NCV of Limerick Unit 2 Technical Specification (TS) 6.8.1, Procedures and Programs, in that Exelon did not provide an adequate procedure for preventive maintenance (PM) of the Limerick Emergency Diesel Generator (EOG) lube oil (LO) filter bypass valves. As a result, Exelon did not identify that the EOG 023 LO filter bypass valves were degraded and allowed oil to bypass the filter during engine operation. This condition, combined with historical foreign material in the LO system, led to the failure of the EOG 023 number 5 upper piston assembly during a 24-hour endurance test run on May 5,2010. Corrective actions implemented included repairing the damage to D23, performing a flush of the D23 LO system, revising the applicable PM procedure to include specific instructions for inspecting the LO filter bypass valves, and revising performance monitoring guidance to ensure spuriously lifting LO filter bypass valves would be identified in the future. The finding was more than minor because it was associated with the Equipment Performance attribute of the Mitigating System cornerstone and affected the cornerstone objective of ensuring 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) in accordance with Inspection Manual Chapter (IMC) 0609, Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations, using SDP Phases 1, 2, and 3. This finding has a cross-cutting aspect in the area of Human Performance, Resources, because Exelon did not provide complete, accurate and up-to-date design documentation, procedures, and work packages H.2(c). Specifically, Exelon did not provide site engineers with complete and accurate resources to ensure performance centered maintenance (PCM) template revisions were thoroughly reviewed and implemented. |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2010004 Section 4OA2 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | E Dipaolo J Lilliendahl N Sieller J Bream P Krohn |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Limerick - IR 05000352/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2010Q3
Self-Identified List (Limerick)
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