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: Mon, 06-06-1994
ERF description: Unit 1 was isolated for scheduled preventive maintenance.
On May 25, 1994 during a routine examination of the main gate valve components of primary circuit the corrosion-induced deterioration of gate valve main joint studs were identified at the points of transition from the thread part to the smooth one. The size of the damage varies from 2 to 10 mm.
At YA 10S02 - 26 studs are damaged
20S01 - 26
40S01 - 24
40S02 - 26

The damage was caused by primary circuit leaks through the gland gasket of the main joint of gate valves. The event has been rated at "1", degradation of defence in depth.

ERF rating date: 31-05-1994
ERF contact person: V. Grishenko
ERF address: KIEV, Ukraine
ERF affiliation: SCIENT. TECHN. DEPT., UKRAINIAN STATE COMM., OBSERVATORNA STR. 11/1

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