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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, 13-01-1994
ERF description: Four workers were exposed internally while they were replacing a filter element of the vacuum filter installed in the sampling system connected to the plutonium receiving vessel of the rework process of the Tokai Reprocessing Plant on December 27, 1993. At the time of incident, operation of the Tokai Reprocessing Plant was stopped for routine maintenance from December 5, 1993. The cause of the internal exposure was that the four workers inhaled plutonium particles dispersed from the filter element in the vacuum distribution room. The floor of vacuum distribution room was contaminated by this radioactive release. The bio-assay analysis results on January 11, 1994, showed that the maximum estimated internal exposure over 50 years was 90 mSv of effective dose equivalent and 1700 mSv of tissue dose equivalent for one of the 4 workers. Both dose equivalents exceeded the legal dose limit (50 mSv/y and 500 mSv/y), respectively.
The rating of this event is classified at level 2 under the on-site impact criterion.
ERF rating date: 11-01-1994
ERF contact person: N. NONAKA
ERF address: TOKYO 100, Japan
ERF affiliation: STA, 2-2-1 KASUMIGASEKI, CHIYODA-KU

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