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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: Fri, 15-06-2007
ERF description: On March 15, 2007, Nuclear and Industrial Safety Agency (NISA) received a report from Hokuriku Electric Power Company (HEPCO) on a criticality accident at Shika Nuclear Power Plant unit 1 (BWR). The accident occurred in 1999 during periodic inspection, but was not reported to NISA at that time. The fact was discovered by HEPCO during full check of data falsification being conducted according to NISA’s order issued on November 30, 2006.

The report of the accident was submitted from HEPCO to NISA on March 30 and April 6, 2007.

The report describes that the event occurred during the test of the hydraulic control rod system at the time of reactor shutdown. False steps taken in the test caused the pressure increase in the control rod withdrawal pipes and resulted in a simultaneous drops at 3 control rods that made reactor criticality for approximately fifteen minutes.
ERF rating date: 14-06-2007
ERF contact person: Shin MORITA
ERF address: 1-3-1 Kasumigaseki, Chiyoda, Tokyo 100-8901 Japan
ERF affiliation: Nuclear and Industrial Safety Agency

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