Stichting Laka

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, 24-04-1996
ERF description: Ulchin unit 1 was operated at full power. During normal operation, one of the main feedwater control valves was opened and reactor was tripped by steam generator level high-high signal. Investigation revealed that photoresistic cell in the feedwater control system, which gave certain value to consider the influence of feedwater temperature in comparing steam generator level and programmed feedwater flow, was degraded by the effect of heat generated in nearby resistance. Plant was returned to normal operation after replacement of failed control circuit.
There was no release of radioactive materials outside the reactor building and no unplanned exposure to employees.
Justification: As full safety functions were available. the event is rated at level "0" as per User's manual, Part III, Table II, A1.
ERF rating date: 09-04-1996
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.
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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