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Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Tue, 12-05-1992
ERF description: At 15.30 hrs. of 4.11.91, when unit was under shut down, Class-III bus P supply breaker from Station Auxiliary Transformer tripped on inverse time over current protection. Diesel Generator-1 on Bus-P side started and its breaker closed. But the fault was on Bus side of the supply breaker and hence the DG-1 breaker also tripped on feeding the fault. The breakers connecting bus-P to the other leg, Bus-Q closed. This resulted in tripping of Bus-Q supply breakers also along with the tie breaker. Bus-P was then isolated & bus-Q was normalised and all essential loads were normalised through Bus-Q. The event was caused by high resistance contact in the breaker finger contacts causing deterioration of insulations.
The event can be classified unter B-IR of user's manual as level 1/2. The small flame in the breaker was quenched before any serious consequences could occur. Even though Bus-P became fully unavailable, the other leg, Bus-Q was normalised within a short duration. Moreover the unit was also under cold shut down. Hence there was no serious effect felt on unit operation. Hence the lower rating of level-1.
ERF rating date: 01-01-1992
ERF contact person: MR. V. KUMAR
ERF address: BARC, TROMBAY, India
ERF affiliation: GOVERNMENT OF INDIA, ATOMIC ENERGY REGU, OPERATING PLANTS SAFETY DIVISION, CENTRAL COMPLEX, 4TH FLOOR

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Power Reactor Research Reactor Radwaste Facility Enrichment Facility Radiation Source Irradiation/Accelerator Facility Transportation

Fuel Fabrication Fuel Reprocessing Research Facility Mining/Milling Radioisotope Processing/Handling Facility Other