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: Sat, 09-01-1999
ERF description: Both reactors were operating at full power during a severe storm when all off-site power connections were lost. The operators manually tripped both reactors at 00.22 hrs. All post-trip cooling functions were provided automatically by the Reactor Shutdown Sequence Equipment (RSSE). Electrical power was supplied initially by the emergency diesel generators. Off-site power connections were restored within a few hours and the reactor cooling functions were returned to normal power supplies.
The reactors remained shutdown, and at 11.05 hrs a second loss of off-site power supplies occurred. The RSSE was not yet available to automatically reconfirm the essential supply systems, and the trip cooling functions could not be re-established. The operators decided to establish natural circulation cooling on both reactors, and declared a Site Emergency condition.
Natural circulation was established on both reactors within about an hour, and forced circulation was returned in about 3 hours. Shortly after this the off-site power connections were restored and reactor cooling functions were again returned to normal. The RSSE equipment was then reset to provide automatic electrical support in the event of a subsequent loss of off-site power supplies.
ERF rating date: 07-01-1999
ERF contact person: C. PATCHETT
ERF address: Stanley Pricinct, Bootle, L20 3LZ, United Kingdom
ERF affiliation: Health and Safety Executive, Nuclear Safety Directorate, St. Peters House

This map shows a selection of reports from nuclear and radiological incidents stored in the IAEA NEWS-database.
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