The team identified a finding of very low safety significance involving a non-cited violation of
Technical Specification (TS) 3.8.4.5, in that Exelon did not verify certain battery connection resistances were within the TS limit. Specifically, Exelon did not verify the inter-tier connection resistances to be within the
TS 3.8.4.5 limit of less than or equal to 40 micro-ohms every 12 months. The team determined that Exelon exempted the inter-tier connections from the testing requirement. In response, Exelon performed the required testing and identified a connection in the 2B battery that was greater than the TS limit. Exelon restored the degraded connection and initiated actions to revise the surveillance test procedures to incorporate all battery connections. This issue was more than minor because it was associated with the procedure quality attribute of the
Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. The team determined the finding was of very low safety significance (Green) because it did not result in a loss of safety system function. Because the licensee had previously identified a similar inadequacy in the test procedure, the finding had a cross-cutting aspect in the area of Problem Identification and Resolution - Corrective Actions. (
IMC 0305, aspect
P.1(d)) (1R21.2.1.1)
