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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, 16-10-1996
ERF description: Yonggwang unit 4 was operated at the rated power. During normal operation, reactor was tripped due to the dropping of control rods. Investigation revealed that CEAC (Control Element Assembly Calculator) #1 caused the reactor trip because one of the optical isolator had failed and generated wrong control rod position signal.
There were no releases of radioactive materials outside the reactor building and no unplanned exposure to employees.
Even though there were the same events in Yonggwang unit, the licensee has done his bet to take corrective measures. So, 'safety culture deficiency' was not applied to this event.
Justification: As full safety unctions were available, the event is rated at level "0" as per User's manual Part III, Table II, A1.
ERF rating date: 10-10-1996
ERF contact person: JEONG-IL YOO
ERF address: GOVERNMENT COMPLEX II, South Korea
ERF affiliation: NUCLEAR INSPECTION AND ENFORCEMENT DIV, ATOMIC ENERGY OFFICE, MIN. OF SCIENCE & TECHN.

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