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A finding of very low safety significance … A finding of very low safety significance and an associated NCV of Braidwood Operating License Condition 2.E, Fire Protection Program, was self-revealed during the performance of a scheduled diesel-driven fire pump (DDFP) sequential start surveillance when the DDFP was observed by operators to start, but then cycle on and off. The DDFP was declared non-functional and a subsequent causal evaluation determined that an incorrectly designed DDFP stop pushbutton switch had been installed several months prior to the identification of the issue. The licensee entered this issue into their CAP as IR 1649515, Incorrect Stop Pushbutton Installed on 0B Fire Pump. Corrective actions included replacing the switch with a switch of a correct design. The inspectors determined that the performance deficiency was more than minor in accordance with IMC 0612, Appendix B, Issue Screening, because the issue 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 (i.e., core damage). Specifically, the performance deficiency resulted in a non-functional DDFP. The finding was determined to be of very low safety significance by a NRC Senior Reactor Analyst. The inspectors concluded that this finding had a cross-cutting aspect in the Avoid Complacency component of the Human Performance cross-cutting area because the licensee did not adequately recognize and plan for the possibility that the DDFP stop pushbutton replacement switch design could have been different than plant-specific design requirements (H.12).plant-specific design requirements (H.12). +

Discovered date

23:59:59, 30 September 2014 +

Docket

05000456 + and 05000457 +

Event date

23:59:59, 30 September 2014 +

Finding integer

3 +

Finding type

Non-cited violation +

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INPO aspect

QA.4 +

Identified by

Self-revealing +

Inspection Manual Chapter

NRC Inspection Manual 0612 Appendix B +

Inspection procedure

IP 71111.19 +

Inspection report

IR 05000456/2014004 +

Inspector

Eric Duncan +, J Laughlin +, D Betancourt +, R Jickling +, M Perry +, Brent Boston +, Matthew Learn +, Lionel Rodriguez +, Rhex Edwards +, Tony Go + and Jamie Benjamin +

Issue report

AR 01649515 +

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12:59:17, 25 September 2017 +

Person