05000482/FIN-2010005-01
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Finding | |
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| Title | Failure to Properly Identify and Evaluate Degraded Piping in the Train A Essential Service Water System |
| Description | The inspector identified a Green noncited violation of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the licensee\'s failure to properly evaluate a condition adverse to quality involving train A of the essential service water system. The cause and extent of condition of the pitting corrosion of the essential service water piping was not fully addressed by the licensee due to inadequate analysis and lack of engineering justification for the assumptions used to evaluate the degradation. As a result, the licensee was unable to ensure the pitting degradation did not reduce essential service water pipe wall thickness below the minimum allowed ASME code specifications. This resulted in train A of the essential service water system being declared inoperable from 2:20 p.m. until 10:21 p.m. on December 9, 2010, while measurements of the piping wall thickness were obtained. The licensee entered this issue into the corrective action program as Condition Report 18785. The failure to properly evaluate the degraded condition of the essential service water piping was a performance deficiency. The inspector determined this finding was more than minor because it was associated with the human performance attribute of the Mitigating Systems Cornerstone , and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to events to prevent undesirable consequences. The inspector determined the significance of the finding using IMC 0609.04, Phase 1 - Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because it did not represent an actual loss of safety function of a single train for greater than its technical specification allowed outage time. This finding had a crosscutting aspect in the human performance cross-cutting area, decision making component, because the licensee did not use conservative assumptions in its decision making when they initially used non-conservative values without adequate engineering justification to conclude that the train A essential service water piping met minimum wall thickness criteria for operability. |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2010005 Section 1R04 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | G Apger J Groom B Correll N Greene T Farina W Strickland K Clayton D Stearns L Carson D Allen J Adams C Long C Peabody |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Wolf Creek - IR 05000482/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2010Q4
Self-Identified List (Wolf Creek)
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