The inspectors identified an
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 that the
scram time test result for
control rod drive 18-47 was beyond the analyzed
scram time, which resulted in a degraded
control rod drive. Exelon entered this issue into their corrective action program. Immediate corrective actions included fully inserting the
control rod drive and developing a casual analysis to determine the degraded condition. The performance deficiency is more than minor because it is associated with the configuration control attribute 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
control rod drive 18-47 to perform its safety function due to a slower than normal
scram time. The inspectors evaluated the finding using
IMC 0609, Attachment 4, Initial Screening and Characterization of Findings. The inspectors determined that this finding is a deficiency that affected the design or qualification of a mitigating structure, system, or component (
SSC), when the
SSC maintained its operability or functionality. Therefore, the 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, Identification, because Exelon did not identify issues completely, accurately, and in a timely manner in accordance with the program. Specifically, Exelon did not identify that the actual
scram time of
control rod drive 18-47 was beyond the analyzed
scram time, resulting in a degraded
control rod drive.