On 19.03.96, unit was operating at 210 MWe. At 1627 hrs. bleed condenser got boxed up due to spurious signal of high bleed cooler outlet temperature. Bleed condenser level started rising, which initiated reactor set back. Reactor power started coming down and turbine tripped on reverse power. Running feed pump tripped on bleed condenser pressure high. This caused tripping of all primary coolant pumps resulting in reactor trip. The event is rated at level 0. Justification: The initiator is "reacxtor trip" which is categorised as expected. Safety function availability was full. Hence as per Table II A-1, the event is rated at 0.