05000482/FIN-2010003-02
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Finding | |
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Title | Lack of Acceptance Criteria Allows Degraded EDG Power Supply to Remain Inservice |
Description | The inspectors identified a violation of Technical Specification 5.4.1.a, Procedures, for the failure of maintenance personnel to provide an adequate work order that included critical acceptance criteria for the emergency diesel generator B. On October 22, 2010, emergency diesel generator A failed because excessive power supply voltage ripple caused its speed switch to actuate while in standby. Emergency diesel generator B also failed voltage ripple tests on October 27, 2009. On October 27, 2009, voltage ripple was at 2,015 mV, but no acceptance criteria were specified in Work Order 09-321599-000. Corrective action was not taken until March 2010 and subsequent evaluation of the issue did not identify the lack of acceptance criteria in the work order. The licensee placed this issue into the corrective action program as Condition Report 26651. The inspectors determined that the failure to replace a power supply that was degraded below its acceptance criteria was the performance deficiency. This finding is more than minor because it affected the Mitigating Systems Cornerstone attribute of availability and reliability and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance because the deficiency was confirmed not to result in loss of operability or functionality. This finding has a crosscutting aspect in the area of problem identification and resolution associated with the corrective action program because several work groups failed to question the March 17, 2010, results and initiate a condition report |
Site: | Wolf Creek ![]() |
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Report | IR 05000482/2010003 Section 1R15 |
Date counted | Jun 30, 2010 (2010Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | R Deese G Guerra C Graves G Miller C Long C Peabody G Apger N Greene |
CCA | P.1, Identification |
INPO aspect | PI.1 |
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Finding - Wolf Creek - IR 05000482/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2010Q2
Self-Identified List (Wolf Creek)
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