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, 16-10-1996
ERF description: Ulchin unit 2 was operated at the rated power. On Sep. 14, 1996, a lot of jellyfish had moved to the seaside and blocked the sea water screen. As sea water did not flow sufficiently to the intake area, one of the circulating water pumps was tripped because of NPSII low signal.
Reactor power was reduced to 69% of full power. However, incoming of jellyfish was not stopped and the other circulating water pump was tripped also. Vacuum low signal from main condensers arose and it made turbine trip. Reactor was tripped by turbine trip signal finally.
The plant was returned to normal operation the same day after the jellyfish had been removed.
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: 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.
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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