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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: Mon, 08-08-1994
ERF description: NPP Krsko was operated at full power. At 1:00 a.m. the asymmetry of phases of electrtical current on heater drains pump motor was noted. Measurement of currents on electrical generator, as a diagnostic tool, started. An ampere-meter was connected in the protection circuit of the differential relay. When adjusting measuring range of the ampere-meter, the circuit was interrupted which caused activation of the relay and subsequently disconnection of the switchyard breaker and of the BBC breaker followed by turbine and reactor trip (power was greatger than 10%). The investigation showed that the asymmetry was caused by open disconnect switch of one phase on 400 kV power line, which serves for external power supply of the power station. After the fault was corrected, the station was connected to the electric supply system.
The event was rated level 0 under the criterion defence in depth with no safety significance (Section III.-2.2.2, Table II).
It was establshied that a work order together with written instruction for current measurements on generator was issued, but no measurement procedure existed.
ERF rating date: 04-08-1994
ERF contact person: Mr. M.F. Levstek
ERF address: Vojkova 59, 1113 LJUBLJANA, Slovenia
ERF affiliation: Slovenian Nuclear Safety Administration

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