The NRC identified a finding of very-low safety significance (Green) and an associated
NCV of Title 10, Code of Federal Regulations (CFR), Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensee failure to correct a
Condition Adverse to Quality (
CAQ) associated with a seismic piping interaction affecting the Motor Driven
Auxiliary Feedwater (
MDAFW) system. Specifically, the licensee identified a
flange clearance to the Unit 1
MDAFW suction piping was nonconforming and captured it in the Corrective Action Program (
CAP) as Action Request (
AR) 01684524. However, the licensee closed the
AR without correcting the
CAQ. The licensee captured the inspectors concern in the
CAP as
AR 02212810 and performed an evaluation that reasonably concluded the
MDAFW remained operable.The performance deficiency was determined to be more-than-minor because it was associated with the
Mitigating Systems cornerstone attribute of protection against external factors and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. The finding screened as of very-low safety significance (Green) because it did not result in the loss of operability or functionality of
mitigating systems. Specifically, the licensee performed an
operability determination which concluded the stresses resulting from the seismic interaction would reasonably be bounded by the applicable stress operability limits. The team did not identify a cross-cutting aspect associated with this finding because it was not confirmed to reflect current performance because the performance deficiency occurred more than 3 years ago. Specifically, the licensee closed
AR 01684524 without correcting this
CAQ on September 20, 2011.