A self-revealed finding of very low safety significance (Green) and associated
NCV of
Technical Specification 5.4.1.a was identified on March 7, 2011, when a broken wire lug prevented closure of the 1/2
emergency diesel generator (
EDG) output supply breaker to Unit 2 during
core spray system logic testing. The failure to identify or correct wire routing deficiencies during cubicle inspections was a performance deficiency and a finding. The inspectors identified that work instructions did not contain sufficient detail to ensure that breaker wiring was configured correctly and the ability to perform safety functions was not adversely impacted. The broken lug was repaired and the 1/2
EDG was declared
operable to Unit 2 on March 8, 2011. The issue was documented in the corrective action program as
Issue Report 1184304. This issue was more than minor because, if left uncorrected, the performance deficiency would have the potential to
lead to a more significant safety concern in that similar failures could result in a loss of safety function. Inspectors performed the
SDP phase 1 screening using
IMC 0609, Attachment 4, Table 4a,
Mitigating Systems Cornerstone column, and answered all questions No. Therefore, this finding screens as Green, or very low safety significance. The inspectors identified that this finding has a cross-cutting aspect in the Problem Identification and Resolution - Operating Experience Component. Specifically, the licensee failed to implement and institutionalize internal operating experience concerning the improper routing of cubicle wiring through appropriate changes to the station preventative maintenance program (
P.2(b))
