On March 02, 1997 monthly Emergency Core Cooling System (ECCS) test was in progress. While carrying out the injection test, fluctuation in the Primary Heat Transport (PHT) system pressure was observed. Subsequently PHT system pressure went up to 89 kg/cm2. During this transient bleed flow increased steeply due to bleed control valve stuck open for about 80 secs. To cope up with bleed flow, feed control valves also got opened. Reacor set back got initiated due to bleed condenser high level. This was flollowed by reactor tip on PHT system pressure low. Further fall of PHT system pressure initated ECCS actuation. Subsequently PHT system pressure recovered back to normal and ECCS was detached. The event is rated at level 0 on INES. Justification: The initiator in this event was "loss of reactor coolant system pressure control (high or low)" due to failure or inadvertent operation of an active component (e.g. feed, bleed, or relief valve)" which is an expected initiator. The safety system availability during the event was full. As per Table II (for incidents involving a real initiator) of User's manual the event is rated at level 0 on INES.
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