Condensator cleaning device and operation method therefor

In a BWR type power generating facility, an iodine removing filter is disposed to the exhaustion side of a condensator vacuum pump for exhausting gases in a turbine condensator. After shutting down a plant, a condensator vacuum breakable valve is opened, and air is supplied to the condensator to reach atmospheric pressure. Then, the vacuum breakable valve is closed, a vacuum pump is operated to evacuate the inside of the condensator. The air at the top end of a secondary pipeline and equipments expands in association with the pressure reduction, so that radioactive iodine in the pipelines and equipments flows out to a gas phase of the condensator. During evacuating operation of the condensator, predetermined valves are operated so that exhausted gases from the vacuum pump pass through the iodine removing filter. The radioactive iodine discharged from the condensator is adsorbed to the iodine removing filter, and then it is released from an exhaustion pipe. Then, the vacuum breakable valve is opened again, and the condensator and equipments of the secondary pipeline are brought to the state of atmospheric pressure. (I.N.)