NRC CAL – NOV (White)

On October 27, 2014, the NRC issued a Notice of Violation to Exelon Generation Company, LLC for a violation of 10 CFR 50.54, "Conditions of Licenses," and risk significant planning standard 10 CFR 50.47(b)(4) associated with a White Significance Determination Process finding. This violation involved Calvert Cliffs Nuclear Power Plant (CCNPP) staff incorporating incorrect threshold values into its emergency action levels (EALs). Specifically, during the replacement of the Unit 2 main steam line radiation monitors, CCNPP's staff inaccurately calculated the associated EALs effluent threshold values for the Alert, Site Area Emergency, and General Emergency classifications. These thresholds were subsequently incorporated into Table R-1, "Effluent Monitor Classification Threshold" of the EALs. This calculation error could have resulted in an over-classification of an event, an unnecessary protective action recommendation, and could have caused offsite response organizations to implement unnecessary protective actions for the public. The finding is also associated with violation of NRC requirements specified in 10 CFR 50.54(q)(2), 10 CFR 50.47(b)(4), and 10 CFR 50, Appendix E. Immediate corrective actions taken to restore compliance included, upon discovery of the incorrect values included entering the issue into the corrective action program, implementing appropriate compensatory actions, and initiating corrective actions to revise the EAL table.