COOK - TECH SPEC REQUIRED SHUTDOWN DUE TO INABILITY TO RESTORE MAIN STEAM ISOLATION AUTOMATIC ACTUATION LOGIC AND ACTUATION RELAYS WITHIN THE REQUIRED TIME

At 1530 on July 19, 2012, operators commenced shutdown of DC Cook Unit 1 to comply with LCO 3.3.2, Condition I when the 6 hour time limit to complete Condition C Required Action could not be completed.

At 0734 on July 19, 2012, operators identified that power had been lost to two of four Steam Generator Stop Valve Dump Valves (Dump Valves) on one of the two trains. DC Cook entered LCO 3.3.2 Condition B for Function 4a, manual initiation: 'restore required channel or train to operable within 48 hours.' DC Cook also entered LCO 3.3.2 Condition C for Function 4b, automatic actuation logic and actuation relays: 'restore required channel or train to operable within 6 hours.' Power was restored to one Dump Valve which was then declared operable at 1030. Efforts continue to restore power to the remaining Dump Valve.
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