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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: Mon, 12-12-1994
ERF description: A scram occurred due to a failure of a condensate pump. Analyses of the pressure versus time charts shows that the secondary pressure exceeded the expected value. During a few minutes the pressure reached almost 110%, i.e. the permitted value. It is therefore questionable whether the vales pressure release function is fulfilling specifications. The reactor is in a standby mode awaiting a throrough examination of the valves. Compressed air is used to adjust the set point of the oopening pressure of the valves. A reason for the failure is that the conversion factor from compressed air to steam was erroneously calculated, corresponding to less than 10% higher opening pressure. This is valid also for Ringhals 3 and 4.
Justification:
Defence-in-depth degradation: incident with significant failures in safety provisions.
Table II: degradation of defence in depth with an initiator.
Safety function availability: adequate.
Initiator frequency/initiator probability: high/expected (PWR, loss of feedwater flow).
ERF rating date: 12-12-1994
ERF contact person: MR. F. REISCH
ERF address: Sweden
ERF affiliation: SWEDISH NUCLEAR POWER INSPECTORATE (SKI)

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