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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: Tue, 23-01-1996
ERF description: A major overhaul was made during the past two years at Oskarshmn-1. Visual and ultrasonic testing revealed cracks in the core shroud and in some connected components and also in the feed water riser pipe.
Based on metallurgical tests and inspections the failure mechanism was determined as thermal fatigue.
The oxidation found in the end of the cracks indicate that the propagation had stopped. Stress calculations show that none of the cracks will grow to critical length at least within five years.
Corrective actions. The shroud support stand and feed water riser pipe have been replaced. Ends of cracks were taken away by electro discharge machining to prevent continued propagation. Inspections and tests will be performed annually.


ERF rating date: 10-01-1996
ERF contact person: MR. F. REISCH
ERF address: Sweden
ERF affiliation: SWEDISH NUCLEAR POWER INSPECTORATE (SKI)

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