Green. The inspectors identified a non-cited violation of
10 CFR 50 Appendix B, Criterion XVI, Corrective Action, because Exelon did not implement corrective actions in a timely manner to correct a
condition adverse to quality on the 2C
core spray motor. Specifically, Exelon did not perform appropriate corrective actions to evaluate and address an increasing motor bearing vibration trend that had existed for over ten years. Consequently, motor vibration reached the fault level established in Exelons vibration analysis procedure. The finding was more than minor, because it was associated with the equipment performance attribute of the
Mitigating Systems cornerstone and adversely impacted the cornerstone objective to ensure the reliability of systems that respond to
initiating events to prevent undesirable consequences (i.e., core damage). In accordance with
IMC 0609.04, Initial Characterization of Findings, dated October 7, 2016, and Exhibit 1 of
IMC 0609, Appendix A, The
SDP for Findings At-Power, dated June 19, 2012, the inspectors determined this finding was of very low safety significance because the performance deficiency did not impact the design or qualification of the component, did not result in a loss of system function, did not result in the loss of function of a train greater than its Tech Spec allowed outage time, and did not represent an actual loss of function for a high safety significant component in accordance with Exelons
maintenance rule program. The inspectors determined the finding had a cross-cutting aspect in the area of Problem Identification and Resolution, Resolution, because Exelon did not take effective corrective actions in a timely manner commensurate with the safety significance of the issue. Specifically, corrective actions to address the elevated vibrations on the 2C
core spray motor were not implemented before motor vibration reached the fault level and adversely impacted the long-term reliability of the motor. [P.3]
