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A self-revealing Green finding (FIN) was i … A self-revealing Green finding (FIN) was identified for the licensees failure to perform adequate preventive maintenance (PM) in accordance with, licensee procedure ADM-NGGC-107, Equipment Reliability Process, for 4 KV Breaker 52/7, Unit Auxiliary to 4 KV Bus 1. As a result, while transferring loads from the start-up transformer, a broken operating rod for breaker 52/7 prevented the breaker from closing and caused an automatic reactor trip. The finding was more than minor because it was associated with the Initiating Events cornerstone attribute of Equipment Performance, and it adversely affected the associated cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the performance deficiency resulted in breaker 52/7 failing to close and subsequently causing an automatic reactor trip from 19 percent power operations on November 5, 2013. Using IMC 0609, Appendix A, issued June 19, 2012, The Significance Determination Process (SDP) for Findings At-Power, the inspectors determined that this finding is of very low safety significance (Green) because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment or functions would not be available. The performance deficiency had a crosscutting aspect of Resolution in the area of Problem Identification and Resolution, because the licensee failed to take effective corrective actions to address a similar failure of an operating rod for the A circulating water (CW) pump breaker in 2011.rculating water (CW) pump breaker in 2011. +

Discovered date

23:59:59, 31 March 2014 +

Docket

05000261 +

Equipment trip

Reactor Trip +

Event date

23:59:59, 31 March 2014 +

Finding integer

3 +

Finding type

Finding +

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INPO aspect

PI.3 +

Identified by

Self-revealing +

Inspection Manual Chapter

NRC Inspection Manual 0609/Appendix A, The Significance Determination Process (SDP) for Findings At-Power +

Inspection procedure

IP 71111.12 +

Inspection report

IR 05000261/2014002 +

Inspector

K Ellis +, M Bates +, G Hopper +, Catherine Scott + and Brendan Collins +

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12:57:24, 25 September 2017 +

Person