05000458/LER-2003-008

11-20-2003

At 10:43 p.m. CDT on September 22, 2003, with the plant operating at approximately 78 percent power, an automatic reactor scram occurred during scheduled testing of the main turbine control valves. The scram signal originated from reactor steam pressure instruments following a malfunction of the main turbine control system which caused the control valves to move toward the closed position.

A containment isolation signal initiated due to the expected reactor low water level alarm, which caused the isolation of the suppression pool cooling system, as designed. This event is being reported in accordance with 10CFR50.73(a)(2)(iv) as a valid actuation of the reactor protection system and the containment isolation logic circuitry. Modifications are being considered to prevent recurrence of this condition.

Turbine control valve testing has been suspended pending further corrective actions.

This event was of very low safety significance, as the response of the plant to the scram signal was bounded by the safety analysis.

LER-2003-008, Automatic Reactor Scram During Main Turbine Control Valve Testing Due to Control System Malfunction
River Bend Station - Unit 1
Event date:	09-22-2003
Report date:	11-20-2003
Reporting criterion:	10 CFR 50.73(a)(2)(iv), System Actuation
4582003008R00 - NRC Website
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River Bend

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		Reporting criterion
05000458/LER-2003-008	Automatic Reactor Scram During Main Turbine Control Valve Testing Due to Control System Malfunction	10 CFR 50.73(a)(2)(iv), System Actuation

05000458/LER-2003-008

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