05000397/FIN-2008005-01
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Finding | |
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| Title | Failure to follow procedures during an overhaul of emergency diesel engine 1A1 |
| Description | The inspectors identified a noncited violation (NCV) of Technical Specification 5.4.1.a (Procedures) for Energy Northwests failure to follow site procedures during an overhaul of the Division 1 emergency diesel engine in 2003. Specifically, care was not exercised to protect diesel fuel oil injector line seating surfaces from mechanical damage during maintenance. In addition, the procedure was inadequate, in that it required an inspection but contained no acceptance criteria. As a result, seating surfaces of diesel fuel oil injector lines were damaged during maintenance and fuel oil leaked into the lubricating oil system during emergency diesel generator operation. The leakage was not immediately noticed during postmaintenance testing (2003), but was identified substantially later during lubricating oil viscosity testing (2008). Fuel leakage into the lubricating oil system has rendered emergency diesel generators inoperable at other sites and the vendor stipulated that this condition can result in crankcase explosions and severe damage. The licensee\'s initial review of the issue failed to identify the inadequate inspection requirements. Further, the licensee did not follow the vendor manual recommendation of replacing the lubricating oil filter until identified by the inspectors. Energy Northwest entered the issues into the corrective action program as Condition Report 187580. The finding was more than minor because, if left uncorrected, it could result in a more significant safety concern. Specifically, postmaintenance testing may not immediately identify fuel injector damage following maintenance and the damage could render the emergency diesel generator inoperable during event response. Using the Manual Chapter 0609, Significance Determination Process, Phase 1 screening worksheet, the finding was of very low risk significance (Green) because it was a qualification deficiency confirmed not to result in a loss of emergency diesel generator operability. While the procedural deficiencies were aged, the licensee missed a recent opportunity in 2008 to identify the problems because they repaired the diesel but did not evaluate the adverse condition. This issue had a crosscutting aspect associated with Problem Identification and Resolution (corrective action program component), in that the licensee failed to thoroughly evaluate the problem such that the resolution addressed the caus |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2008005 Section 1R12 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | B Henderson R Cohen T Mckernon L Carson G Replogle W Sifre M Hayes M Bloodgood T Pate |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Columbia - IR 05000397/2008005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2008Q4
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