Severity Level IV. The inspectors identified a
Severity Level IV NCV of
TS 5.5.12 for the failure to comply with the TS Basis Control Program. Specifically, the licensee made a change to the TS bases for
TS 3.9.5 which altered the TS definition of \\\"two
SDC trains\\\" described in
TS 3.9.5. The licensee changed the bases to allow a single
SDC to be a member of two trains with cavity level less than 647 feet. A distinct SDCHX is required for each train. This change required prior NRC approval as a change to the TS. This issue was entered into the licensees corrective action system. The inspectors concluded this finding is more than minor since it impacted the NRCs ability to perform its regulatory function and resulted in a condition having a very low safety significance (i.e., green). Specifically, the licensee changed the TS bases in a manner that required prior NRC approval. The finding is a
Severity Level IV violation consistent with the
NRC Enforcement Policy. The inspectors also determined that this finding has a cross-cutting aspect in the area of human performance, because the licensee failed to use conservative assumptions in changing the TS bases. (
IMC 0305 H.1(b)) (Section 4OA5.2)
