INES-event
INES 0

REACTOR TRIP DUE TO FLUCTUATION OF PRESSURE IN MOISTURE SEPARATOR AND REHEATER (MSR) DRAIN TANK

The plant power maintained at 75% rated power after scheduled refuelling outage. Both level switch vent valves of MSR drain tank and 1st stage reheater drain tank were not fully closed. When separator closed level switch vent valve of 1st stage reheater drain tank, pressure transient happened at upper side MSR tank piping connected to level switch. Tank level "hi-hi" signal was one.
As full safety functions were available, the event is rated at level 0 as per user's manual part III, Table II, A1.

Location: KORI-2
Event date: Wed, 10-11-1993
Nuclear event report
Legenda & explanation