VENTILATING AND AIR-CONDITIONING FACILITY

PURPOSE:To permit to reduce the amount of exposure of operators in a central control chamber upon the trouble of atomic power plant by a method wherein air, whose volume is corresponding to removed carbon dioxide, is taken into the chamber in order to keep an atmospheric pressure without increasing the concentration of carbon dioxide. CONSTITUTION:Air, recirculated by emergency recirculating fans 14a, 14b and fans 3a, 3b upon the trouble of the plant, passes through a carbon dioxide removing device 20. In this case, carbon dioxide in the air is removed. Particulate suspended radioactive materials and soluble radioactive materials, remaining in the air taken into the central control chamber 2, are also removed in this case. In case the atmospheric pressure of ventilated and air-conditioned system is reduced due to the removal of carbon dioxide, isolating dampers 13a, 13b are opened and air, whose volume is corresponding to the amount of removed carbon dioxide, is taken into the chamber. Accordingly, small amount of air, taken into the central control chamber 2, may be sufficient for ventilation and the amount of exposure of the operators in the central control chamber may be reduced remarkably.