Green. The NRC identified a non-cited violation of Title 10 of the Code of Federal Regulations (CFR) Part 50, Appendix B, Criterion XVI, Corrective Actions, for the licensees failure to assure that a
condition adverse to quality associated with a damaged trench cover on the yellow trench was identified and corrected. Specifically, the seismic design function of the trench cover was not identified or recognized at the time of the licensees original identification of the issue and subsequent
NCR generation, and, due to this error, appropriate corrective actions were not assigned or completed. In response to the issue, the licensee replaced the broken trench cover on the yellow trench with a temporary cover on March 22, 2017 , and planned
work order 20147282 to replace it with a permanent cover to restore the design configuration . This performance deficiency was more than minor because it was associated with the Design Control Attribute of the
Mitigating Systems Cornerstone, and adversely affected the cornerstone objective of ensuring availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, inadequate identification and correction of this
condition adverse to quality adversely impacted the trench covers reliability and capability to perform its function during and following a seismic event. 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 mitigating structure, system, or component (
SSC), and the
SSC maintained its operability or functionality. The team determined that the finding was indicative of current licensee performance, because the issue was first identified in January 2017. A cross -cutting aspect of Consistent Process [H.13.] in the Human Performance Area was assigned because individuals did not use a consistent, systematic approach to make decisions.
