On 24/1/92, Unit was under start up, reactor power was around 2% F.P. and 6 Nos. H.T. circulating pumps were operating. At 0420 hrs. sudden increase in bleed flow indication (from 400 lpm to 1000 lpm) and H.T. storage tank level hunting was observed. Storage tank level was dropping. PHT pressure control signal was 40 ma constant (feed side) and there was no significant hunting in H.T. pressure. Beetles at moderator room floor alarmed. IX room (1188 el. floor) was full of water vapours. Immediately H.T. system cooling was started. Then only leak could be identified from hose connection of one of the PHT purification filter (3321-FR-20). Same was isolated. 4 boilers were drained to make up H.T. storage tank. R.B. exhaust fan was stopped to reduce the tritium activity release to environment. Shut down cooling system was valved in when H.T. temp. was about 120 deg. C. Meanwhile during the occurrence, Bleed cooler outlet temp. high alarm annunicated, the Emergency core cooling system was actuated, its valves were lined up, and reactor building also bot boxed up. Running primary feed pump tripped causing tripping of operating circulating pumps. ECCS was blocked after isolating the leak and starting of auxiliary feed pump. Storage tank level was maintained to about 26 cm by draining boilers.
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