05000498/FIN-2014005-01
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Finding | |
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| Title | Failure to Identify a Condition Adverse to Quality on Train A Emergency Diesel Generator |
| Description | The inspectors documented a self-revealing non-cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to promptly identify and correct a condition adverse to quality following an unexpected alarm on the train A emergency diesel generator. Specifically, after receiving the, E-5 Starting Air System Malfunction alarm, the licensee did not identify the correct cause of the alarm or take the necessary action to ensure the operability and reliability of the emergency diesel generator. As a result, the train A emergency diesel generator was degraded for 20 days, and was later rendered inoperable and non-functional for approximately 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> when operators removed the only air start subsystem that remained unaffected from service. This issue was entered into the corrective action program as Condition Report 14-18639, and the cause was corrected. Failure to identify the cause for the starting air system alarm and recognize that this degraded the starting function was a performance deficiency. This performance deficiency is more than minor because it affected the equipment performance attribute of the Mitigating Systems Cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to correctly identify and correct the cause of the E-5 Starting Air System Malfunction alarm resulted in the train A emergency diesel generator being degraded and later inoperable. Using NRC Inspection Manual 0609, Appendix A, The Significance Determination Process for Findings At-Power, the finding was determined to be of very low safety significance (Green) because it did not: 1) affect the design or qualification of a mitigating structure, system, or component; 2) represent a loss of system and/or function; 3) represent an actual loss of function of a single train for greater than its technical specification allowed outage time; and 4) represent an actual loss of function of one or more non-technical specification trains of equipment designated as having high safety-significance. This finding has a cross-cutting aspect in the area of problem identification and resolution associated with Evaluation because the licensee failed to thoroughly evaluate the issue to ensure that resolutions address the causes and extent of conditions commensurate with the safety significance. Specifically, the licensees failure to fully evaluate the cause of the starting air system alarm, and as a result, failed to recognize and correct the out-of-position valve before it rendered the system inoperable [P.2]. |
| Site: | South Texas  |
|---|---|
| Report | IR 05000498/2014005 Section 1R15 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | A Sanchez B Baca D Holman D Proulx G Guerra J Kramer K Clayton N Hernandez N O'Keefe P Elkmann R Kumana |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI Technical Specification |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - South Texas - IR 05000498/2014005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2014Q4
Self-Identified List (South Texas)
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