COOLANT DRAIN SYSTEM OF REACTOR

摘要

PURPOSE: A coolant drain system of a reactor is provided to reduce capacity of a reactor drain tank discharge valve by sending all gas to an IRWST according to a natural circulation cooling operation. CONSTITUTION: A reactor exhaust valve(11) exhausts a non-condensable gas collected on an upper part of a reactor container. A safety pressure reducing discharge valve(12) is installed to perform a discharging operation to an exhaust tank(4) and an IRWST. The reactor exhaust valve(11) and the safety pressure reducing discharge valve(12) are connected with a common line. The common line is connected to the reactor exhaust tank(4) through an exhaust tank isolation valve(22). A valve leakage discharge line(24) is directly connected to the reactor exhaust tank(4) and connected to a rupture disk(21) for detecting leakage. The common line between the reactor exhaust valve(11) and a rear end of the safety pressure reducing discharge valve(12) is connected to the IRWST with the rupture disk(21). During a natural circulation cooling operation, the reactor exhaust tank isolation valve(22) is closed and the IRWST isolation valve(23) is opened .