A finding of very low safety significance and associated non-cited violation (
NCV) of
Technical Specification (TS) 5.4 was self-revealed for failing to establish procedures to adequately control work activities in the owner-controlled
switchyard. Due to the lack of procedural guidance for review and concurrence of
switchyard activities, intrusive maintenance activities were conducted within a protective relay cabinet resulting in the unplanned isolation of a risk-significant offsite power source. The licensee took immediate corrective actions and entered the issue into their corrective action program. The inspectors determined that the performance deficiency affected the cross-cutting area of Human Performance, having decision-making components, and involving aspects associated with formally defining the authority and roles for decisions affecting nuclear safety, implementing these roles and authorities as designed, and obtaining interdisciplinary input and reviews on risk-significant decisions.
H.1(a) The inspectors determined that the finding was more than minor because it involved the configuration control attribute of the
Initiating Events Cornerstone objective of limiting the likelihood of events that upset plant stability during power operations. The finding was of very low safety significance (Green) because it was not: (1) associated with the likelihood of initiating a loss of coolant accident; (2) did not contribute to both the likelihood of a
scram and unavailability of
mitigating systems; and (3) did not increase the likelihood of a fire or internal/external flood. (Section 4OA3
