The NRC inspectors identified a Green
NCV of
10 CFR 50, Appendix B, Criterion XVI, Corrective Action, because Exelon did not promptly identify and correct a
condition adverse to quality. Specifically, Exelon did not identify and correct a high oil level condition caused by water intrusion in the D emergency
service water pump upper motor bearing resulting in an
inoperable D emergency
service water pump. Following identification of the high level by the inspections, Exelon entered this issue into their corrective action program as issue report 1645010. Exelons corrective action included sealing joints on top of the motor that are susceptible to water intrusion. The inspectors determined that inadequate identification and resolution of the
condition adverse to quality into the corrective action program is a performance deficiency that was within Exelons ability to foresee and correct. This finding is more than minor because it is associated with the configuration control of the
Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the availability, reliability and capability of systems that respond to
initiating events to prevent undesirable consequences. Specifically, the performance deficiency affected the reliability of an emergency
service water pump to perform its safety function. This issue was also similar to Example 3j of NRC
IMC 0612, Appendix E, Examples of Minor Issues, because the condition resulted in reasonable doubt of the operability of emergency
service water system. The inspectors determined that this finding was a deficiency affecting the design or qualification of a mitigating structure, system, or component (
SSC), where the
SSC maintained its operability or functionality. Therefore, inspectors determined the finding to be of very low safety significance (Green). The finding has a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because Exelon did not identify the issue associated with the high oil level in the emergency
service water pump upper motor bearing oil in a timely manner in February and April 2014.