PURPOSE:To suppress the internal pressure of the condenser and the rise in the internal temperature thereof by fully closing an outlet valve provided in an outlet pipeline of a cooling pipe based on a circulation water pump stop sensing signal, installing an outlet pipeline led from a water chamber at the upper part of this water chamber, and causing cooling water to stay in the cooling pipe after the stop of the circulating pump. CONSTITUTION:Seawater sucked up from the sea 7 by means of a circulating pump 8 is sent to cooling pipes 13 and 14 through water chambers 11 and 12 of a heat exchanger 6 and is discharged through water chambers 15 and 16 and outlet valves 17 and 18. When the circulating water pump 8 is fully stopped, the circulating water outlet valves 17 and 18 are abruptly stopped by a controller 20, and circulating water within the cooling pipe 13 and 14 is retained. Further, since the outlet pipes 30 and 31 of the cooling pipes are provided at the upper parts of the water chambers 15 and 16, it can prevent the retained water amount from being removed. by this organization, after the stop of a power plant, the rate of the internal pressure within the condenser and the rise in the temperature of steam within the condenser due to the residual drain and the residual steam can be suprossed to a value less than the allowable value.
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