05000498/FIN-2016007-01
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Finding | |
|---|---|
| Title | Failure to Perform Adequate Periodic Testing of Molded Case Circuit Breakers |
| Description | The team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, which states, in part, a test program shall assure that all testing required to demonstrate that structures, systems, and components will perform satisfactorily in service is identified and performed in accordance with written test procedures which incorporate the requirements and acceptance limits contained in applicable design documents. Specifically, since March 22, 1988, the licensee failed to assure that all testing required to demonstrate that the safety-related molded case circuit breakers would perform satisfactorily in service was performed in accordance with the acceptance limits contained in Institute of Electrical and Electronics Engineers (IEEE) 308-1974. In response to this issue, the licensee determined that the molded case circuit breakers will remain operable while implementing corrective actions to ensure the appropriate testing requirements of the molded case circuit breaker were included in the test programs. This violation was entered into the licensees corrective action program as Condition Report CR 16-2166. The team determined that the failure to detect deterioration and demonstrate operability of molded case circuit breakers through appropriate testing was a performance deficiency. The performance deficiency was determined to be more than minor, and therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, inadequate periodic testing to detect deterioration and to demonstrate continued operability was a significant programmatic deficiency that would adversely affect the reliability of Class 1E molded case circuit breakers to perform satisfactorily in service. In accordance with Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, dated June 19, 2012, Exhibit 2, Mitigating Systems Screening Questions, the team determined the finding to be of very low safety significance (Green) because the finding was a deficiency affecting the design or qualification of a structure, system, or component, and the structure, system, or component maintained its operability or functionality. This finding had a cross-cutting aspect in the area of human performance associated with consistent practices because the licensee did not use a consistent, systematic approach to make decisions. Specifically, the licensee did not use a consistent approach to determine which molded case circuit breakers would or would not be tested [H.13]. |
| Site: | South Texas  |
|---|---|
| Report | IR 05000498/2016007 Section 1R21 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21M |
| Inspectors (proximate) | C Baron C Stott G Gardner J Kirkland M Williams S Hedger T Fanelli T Farnholtz |
| Violation of: | 10 CFR 50 Appendix B Criterion XI |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - South Texas - IR 05000498/2016007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2016Q1
Self-Identified List (South Texas)
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