The NRC identified an
NCV of the Unit 1 and 2 Catawba Nuclear Station (
CNS) Facility Operating License, Condition 2.C.5, for the failure to analyze the spurious operation of two motor operated valves (
MOVs) in the control room area ventilation system (CRAVS) and the adverse impact on control room habitability. The licensee entered the issue in its correction action program as action request (
AR) 01930126 and a
continuous fire watch was already in place due to deficiencies identified during the sites ongoing
NFPA 805 licensing activities. The failure to analyze the spurious operation of two
MOVs in the CRAVS and the adverse impact on control room habitability was a performance deficiency (
PD). The performance deficiency was more than minor because it was associated with the protection against external events (i.e. Fire) attribute of the
Initiating Events Cornerstone and it adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the finding could be reasonably viewed as a precursor to a significant event based on smoke migration into the control room that could challenge control room habitability and lead to an evacuation of the control room. This
PD was the result of degraded defense-in-depth features that limit the effects of a fire to one fire area. The finding was screened as Green because the reactors would be able to reach and maintain
safe shutdown utilizing the standby shutdown facility. No cross cutting aspect was assigned because the finding was not indicative of current licensee performance.
