05000498/FIN-2011004-01
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Finding | |
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| Title | Failure to Follow Standby Diesel Generator Maintenance Procedures |
| Description | The inspectors reviewed a self-revealing noncited violation of Technical Specification 6.8.1.a, for the failure to follow maintenance work authorization number 416904. Specifically on January 27, 2011, mechanics incorrectly aligned the fuel oil delivery valve stop and spring on standby diesel generator 13 cylinder 1R. On July 17, 2011, the control room received an alarm for standby diesel generator 13 because the crankcase lubricating oil level was high out of band. After operability testing on July 15, 2011, fuel oil leaked through cylinder 1R into the crankcase because the spring broke creating foreign material that fouled the injector nozzle. The licensee corrected the error, replaced the spring, and restored operability of the diesel. The finding was more than minor because it affected the Mitigating Systems Cornerstone attribute of Human Performance, and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences because it caused the diesel to be inoperable. The inspectors used NRC Inspection Manual Chapter 0609, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of Findings, dated January 10, 2008, to determine the significance of the finding because it affected the Mitigating Systems Cornerstone while the plant was at power. The finding was determined to be of very low safety significance because it was not a design or qualification deficiency; it did not represent a loss of a system safety function; it did not represent the loss of a single train for greater than technical specification allowed outage time; it did not represent a loss of one or more nontechnical specification risk-significant equipment for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; and it did not screen as potentially risk significant due to seismic, flooding, or severe weather. In addition, this finding had human performance cross-cutting aspects associated with work practices because the licensee did not communicate human error prevention techniques, such as self and peer checking, commensurate with the risk, such that the work activity was performed safely |
| Site: | South Texas  |
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| Report | IR 05000498/2011004 Section 1R15 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | J Dixon G Guerra B Tharakan W Walker M Young D Proulx M Chambers S Makor S Hedger J Watkins J Dykert |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - South Texas - IR 05000498/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2011Q3
Self-Identified List (South Texas)
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