05000483/FIN-2013003-04
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Finding | |
|---|---|
| Title | Failure to Correctly Screen Repetitive Equipment Failures |
| Description | The inspectors identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures and Drawings, for the licensees failure to perform activities affecting quality in accordance with procedures. Specifically, the licensee failed to recognize the significance of repetitive refrigerant leaks on the safety-related Class 1E electrical equipment air conditioning units units and assign the appropriate significance level in accordance with APA-ZZ-00500, Corrective Action Program, Revision 57. This issue was entered into the licensees corrective action program as Callaway Action Request 201304985. Further corrective actions are being evaluated, including enhancements to Callaways corrective action procedure for raising significance of repetitive issues and evaluating new enhancements for the corrective action programs screening process. The failure to perform activities affecting quality in accordance with procedures was a performance deficiency. This performance deficiency was more than minor because it adversely affected the equipment performance attribute of the Mitigating Systems Cornerstone objective of ensuring the reliability of systems that respond to initiating events. Specifically, the licensee failed to recognize the significance of repetitive refrigerant leaks on the safety related Class 1E electrical equipment air conditioning units and assign the appropriate significance level during issue screening, and therefore failed to perform a cause analysis and correct the cause. The finding required a detailed risk evaluation because it involved the potential failure of safety related equipment for longer than the technical specification allowed outage time. A senior reactor analyst determined that the change to the core damage frequency was much less than E-7/yr (Green). In each case, the affected chiller, while incapable of meeting the 30-day design basis mission time, could have still functioned properly and supported the inverters during the probabilistic risk assessment 24-hour mission time. Therefore, there was no quantifiable increase in the core damage frequency or the large early release frequency. This finding has a cross-cutting aspect in the area of problem identification and resolution with a problem evaluation component, because the licensee failed to fully evaluate the collective body of data regarding the Class 1E air conditioning units such that the resolutions address the causes and extent of condition, including proper classification. Specifically the licensee failed to thoroughly evaluate the repetitive failures all facets of this issue, including properly classifying the refrigerant leaks. |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2013003 Section 4OA3 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | P Smagacz T Hartman W Sifre J Dykert J Laughlin L Carson N Greene N O'Keefe |
| Violation of: | 10 CFR 50 Appendix B Criterion V Technical Specification Technical Specification - Procedures |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Callaway - IR 05000483/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2013Q2
Self-Identified List (Callaway)
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