Safety Evaluation Of Indian Nuclear Power Plants Post Fukushima Incident

NAPS-1 Fire Incident in March, 1993 Fire in Turbine Generator (TG) hall initiated by sudden failure of two turbine blades. This resulted in vibrations, leading to rupturing of hydrogen seals and lube oil lines, culminating in a fire. Fire spread to several cable trays, relay panels, etc., This resulted in complete failure of power supply (from grid + Diesel generator/batteries) within 7 minutes of incident. Reactor was shutdown by shutdown system (Fail safe design). Extended Station Blackout at NAPS 1 lasted for a period of 17 hours. Core cooling was maintained by natural circulation of coolant (Thermosyphoning ) by providing fire water to the steam generators as heat sink. (see next slide)

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