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The team identified a Green, non-cited vioThe team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to verify or check the adequacy of design calculation NK-E-001, 125 Volt Direct-Current (VDC) Class 1E Battery System Sizing, Voltage Drop and Short Circuit Studies, Revision 4. The licensee failed to recognize that the actual 125 VDC Class 1E bus voltages had exceeded the maximum design limit voltages for downstream equipment identified in the calculation, and they had not placed any limits on voltages which could exceed the design limit of 140 VDC on the Class 1E System components.140 VDC on the Class 1E System components.  +
23:59:59, 30 September 2018  +
05000482  +
23:59:59, 30 September 2018  +
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05:30:05, 4 December 2018  +
23:59:59, 30 September 2018  +
Failure to Identify 125 VDC Equalizing Voltage Exceeded Design Requirements  +