ISOLATION DEVICE OF REACTOR POWER STATION

PROBLEM TO BE SOLVED: To protect a room wherein components required for operation during some accidents are placed from overflow water, fire, etc., and protect from excess rise of pressure and the like in the room even in the break of steam pipes. SOLUTION: An isolation door 7 having a water seal part and a specific pressure relief part is constituted and with this door 7, a first chamber 3, a second chamber 4 and a third chamber 5 are separated. By making the upper part of the isolation door 7a fire prevention door for specific pressure relief part, and making the lower part a water door constituting a water proof part, damage region in fire and overflow water is restricted and the room is kept in proper temperature and pressure even during a steam line break. Also for pipe break during earthquakes, the function safely shutting down the reactor placed at the lowest underground floor of reactor building can be protected from a plenty of overflow water.