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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, 25-01-1995
ERF description: During test operation after critical, the reactor was automatically shutdown at 1:53 a.m. on December 11. The investigation revealed that there were imperfections in a periodic test procedure of a nuclear instrumentaiton system. This resulted in the generation of a signal which led to reactor automatic shutdown. There were no releases of radioactive materials outside of the reactor facility, nor any unplanned radiation exposures received by employees.
Justification of rating:
Both criterion 1 and 2 were not relevant for the rating of the event.
Criterion 3: "expected" initator (reactor automatic shutdown) occurred, but the safety function availability was regarded as "full" during the event. The box I-A on Table II gave the basic rating of level 0. However, as a procedural inadequacy was found, final rating was uprated to level 1.
Full event description available.
ERF rating date: 26-12-1994
ERF contact person: M. MURAYAMA
ERF address: 1-3-1 KAUMIGASEKI, CHIYODA-KU, TOKYO 100, Japan
ERF affiliation: ANRE/MITI

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.
The map shows a maximum of 100 incidents. If hundred incidents or more are within the map, the yellow perimeter indicates from where events are excluded. Drag or zoom the map to explore different areas.

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