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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: Wed, 27-03-1991
ERF description: During normal operation at 500 MWe power a blowhole in the flange connection of reactor coolant pump (RCP) and its auxiliary pipeline was discovered. Leak rate did not exceed 6 m3/h. According to operating procedure the unit was shut down using reactor scram button (AZ-5).
Breach of unit safe operation limits and conditions did not occur. Radiation situation in the reactor building and on site was within prescribed limits.
Water leakage was caused by defect in the flange connection between the auxiliary pipeline and the pump casing.
BASIS FOR RATING: Initiator - reactor coolant system leakage that would not prevent a controlled reactor shutdown and cooldown.
Event - real, expected.
Safety function availability - full, which corresponds to level 0/1 (A-1R) in Table 2 or level 0 in Table A2. Preliminary rating - level 0.
DIFFICULTIES IN RATING:
ERF rating date: 01-03-1991
ERF contact person: Mr. V.I. Andreev
ERF address: Kitaisky Proezd 7, 103074 Moscow, Russian Federation
ERF affiliation: Min. of Nuclear Power and Industry, of the USSR, Dept. of Principle, Accident Dispatch

This map shows a selection of reports from nuclear and radiological incidents stored in the IAEA NEWS-database.
Locations are estimates. Contact us if a location is wrong.
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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