INES-event
INES 0

AUTOMATIC REACTOR SHUTDOWN CAUSED BY SPURIOUS CLOSING OF THE GATE VALVE AT THE PIPELINE FEEDING THE MAIN CONDENSATE HEATER WITH HEATING STEAM

On July 8, 1994 unit 2 was under normal operation conditions at a thermal power of 2180 MW. The reactor was operated in a single turbogenerator mode. Turbogenerator no. 4 was at an electrical power of 690 MW. At 2:07 am the gate valve at the pipeline feeding the main condensate heater (Low Pressure Heater no. 4) with heating steam closed spuriously because of a failure of the control circuit. The increased water level in LPH no. 4 caused TG no. to trip. The reactor was shut down by the reactor protection system

Location: IGNALINA-2
Event date: Fri, 08-07-1994
Nuclear event report
Legenda & explanation