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At 1207, 9/17/01, with the Plant in Mode 1 … At 1207, 9/17/01, with the Plant in Mode 1 at 100 percent Reactor (Rx) Power, non-safety related DC electrical bus PKOI was inadvertently de-energized while cross-tying power sources in preparation for planned battery maintenance. One lube oil pressure switch for each Main Feed Pump was de-energized which generated an Auxiliary Feedwater Actuation Signal. This resulted in both Motor Driven Auxiliary Feedwater Pumps (MDAFP) starting and Steam Generator (S/G) Blowdown isolating. Reactor Coolant System (RCS) Letdown isolated due to power being lost to the operator's solenoids for valves BBLCV459 and BBLCV460. The MDAFPs injected cold water from the Condensate Storage Tank into all four S/G's during the initial phase of this event. This cold water caused RCS pressure to momentarily decrease to 2218 psig, and Rx power to momentarily rise to 101.18 percent. Rx power and RCS pressure were restored to normal parameters within allowed time limits with no adverse effects. Power was restored to PK01 and plant systems returned to normal operating conditions. The event was caused by inadequate procedural guidance concerning indications of successful electrical bus cross-connection. Corrective actions include procedure revisions to incorporate adequate guidance on electrical equipment manipulations.</br></br>FACILITY NAME (1) PAGE (3) DOCKET (2) LER NUMBER (6) 05000 2001 - 005 - 00 2 � of � 4UMBER (6) 05000 2001 - 005 - 00 2 � of � 4 +
September 17, 2001 +
At 1207, 9/17/01, with the Plant in Mode 1 … At 1207, 9/17/01, with the Plant in Mode 1 at 100 percent Reactor (Rx) Power, non-safety related DC electrical bus PKOI was inadvertently de-energized while cross-tying power sources in preparation for planned battery maintenance. One lube oil pressure switch for each Main Feed Pump was de-energized which generated an Auxiliary Feedwater Actuation Signal. This resulted in both Motor Driven Auxiliary Feedwater Pumps (MDAFP) starting and Steam Generator (S/G) Blowdown isolating. Reactor Coolant System (RCS) Letdown isolated due to power being lost to the operator's solenoids for valves BBLCV459 and BBLCV460. The MDAFPs injected cold water from the Condensate Storage Tank into all four S/G's during the initial phase of this event. This cold water caused RCS pressure to momentarily decrease to 2218 psig, and Rx power to momentarily rise to 101.18 percent. Rx power and RCS pressure were restored to normal parameters within allowed time limits with no adverse effects. Power was restored to PK01 and plant systems returned to normal operating conditions. The event was caused by inadequate procedural guidance concerning indications of successful electrical bus cross-connection. Corrective actions include procedure revisions to incorporate adequate guidance on electrical equipment manipulations.</br></br>FACILITY NAME (1) PAGE (3) DOCKET (2) LER NUMBER (6) 05000 2001 - 005 - 00 2 � of � 4UMBER (6) 05000 2001 - 005 - 00 2 � of � 4 +
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November 9, 2001 +
September 17, 2001 +
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