INES-event
INES 2

RADIOACTIVE CONTAMINATION IN AUXILIARY BUILDING

On January 12, 1994 at 10 a.m. during a routine surveillance walkdown a radiation monitoring operator detected increased background gamma radiation of 0.0015 mSv/h at the entrance of auxiliary building C-117.
Due to leaktightness failure of isolating valves the radioactive medium with specific activity of 1.85-10E6 Bq/l got released from the primary bypass purification system pipeline into the low pressure compressed air system and from the latter into building C-117 in dropwise form.
There was no contamination off-site or personnel exposure.

Location: ZAPOROZHE-4
Event date: Wed, 12-01-1994
Nuclear event report
Legenda & explanation