PNO-II-86-045A, primary Sys Temp Dropped from 550 F to 465 F in 6 Minutes.Reactor Coolant Pumps Operated Throughout Event.Poor Human Factor Design Features Caused Operators Not to Be in Control

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• PNO-II-86-045, on 860627,four PORVs Opened,Dropping Primary Sys Pressure from 2,235 Psi to 702 Psi & Temp from 550 F to 450 F in 6 Minutes.Cause Under Investigation.Valves Closed & Safety Injection Initiated