An NRC-identified non-cited violation (
NCV) of
Technical Specification (TS) 5.4.1.d was identified for failure to maintain an
operable fire assembly resulting in an unsealed pipe
penetration through a 3-hour rated
fire barrier wall separating the Unit 2 Train A/B motor driven
auxiliary feedwater pump room from the Unit 2 mechanical
penetration equipment room. The licensee reinstalled pipe caps on each end of the unsealed pipe. The performance deficiency (
PD) was more than minor because it was associated with the protection against external events attribute of the
Mitigating Systems cornerstone and adversely affected the cornerstone objective in that the unsealed opening adversely impacted the ability of the
fire barrier to perform its intended safety function. The finding was of very low safety significance because the
fire barrier deficiency represented a low fire degradation rating. The finding was directly related to the cross-cutting area of Human Performance under the Procedural Compliance aspect of the Work Practices component because station personnel failed to follow fire protection impairment procedures for breaching a fire assembly.
