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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: Thu, 28-07-2005
ERF description: On March 10, 2004, Kakrapar-1 a 220MWe PHWR was operating at a power level of 73% full power. While carrying out certain maintenance work, power supply to all the adjuster rods of the Reactor Regulating System (RRS) failed and the rods became inoperable. Reactor power started rising slowly due to the presence of slight positive reactivity at that instant. Further, the automatic liquid poison injection system was inhibited at this time to prevent addition of boron to moderator, that would take place if there was any slight disturbance to core reactivity during on power refueling. With this the slow rise in reactor power could not be arrested by RRS and the reactor tripped on high differential temperature across steam generators. The reactor tripped at a power level of 98% FP as the trip settings had not been changed corresponding to the reduced operating power level. The fuel bundle power of the maximum rated channels crossed the Technical Specification limit but was within the safety limits. There was no failure of fuel and no increase in iodine activity in Primary Heat Transport system was observed during and after the event. The event is rated at level 2 on INES.
ERF rating date: 28-07-2005
ERF contact person: S.K Sharma
ERF address: Niyamak Bhavan, Anushakti Nagar, Mumbai – 400 094.
ERF affiliation: Atomic Energy Regulatory Board

This map shows a selection of reports from nuclear and radiological incidents stored in the IAEA NEWS-database.
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Fuel Fabrication Fuel Reprocessing Research Facility Mining/Milling Radioisotope Processing/Handling Facility Other