| 摘要 |
PURPOSE:To reduce the amount of radiation to which the operator might be exposed, by a method wherein the density of carbon dioxide is detected and an isolating damper provided on the downstream side of an open air inlet port is controlled in accordance with the detected density of the carbon dioxide. CONSTITUTION:The ventilation and air conditioning equipment for a room 1, where accommodation property is required to stay even at the time of accident, operates such that when the atomic power plants is in the ordinary operation condition, air from the open air inlet port 4 is supplied into the room 1 by an air supply duct 6 through the isolation damper 5 and an air conditioner 2 and a part of the air returns to the air conditioner 2 again through a return duct 8. When an emergency signal is received by a switch 7, a damper opening degree adjuster 10 operates to open the isolating damper 5 to the full. Then, when the density of carbon dioxide in the room 1 increases with the lapse of time, a carbon dioxide detector 9 transmits a density signal to the damper opening degree adjuster 10 so that the damper 5 is opened to a predetermined degree to thereby maintain the density of carbon dioxide in the room at a value lower than a predetermined value. |
