| 摘要 |
PROBLEM TO BE SOLVED: To shorten lowering operation of oxygen dissolved in coolant which is performed in startup of a nuclear power plant and realize quick startup. SOLUTION: A nuclear power plant is provided with a coolant pump 3, a reactor vessel 1 connected to the coolant pump 3 via an inlet nozzle 1a, steam generators 2 connected to the outlet nozzle 1b of the reactor vessel 1 and a pressurizer 4 provided to the pipe between the reactor vessel 1 and the steam generator 2, which constitutes reactor cooling system of closed loop by communicating the coolant outlet of the steam generator 2 to the coolant pump 3. A dissolved oxygen concentration lowering device is constituted of a purging type degassing device 10 by nitrogen gas placed in the circulation system communicating to the reactor coolant system, a vacuum pump 11 provided to the pressurizer 4 and nitrogen injection systems 18a and 18b communicated to the reactor cooling system.
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