NUCLEAR POWER PLANT AND METHOD FOR OPERATING IT

摘要

PROBLEM TO BE SOLVED: To maintain the smoothness of the surface of an in-furnace constituting member and make it possible to suppress the increase of flow resistance by forming an electrically insulative film on the surface of the in-furnace constituting member that is soaked in reactor water and is in direct contact with the reactor water whose flow speed is high and which contains Cr ions during the operation of a reactor. SOLUTION: A branch pipe for taking out reactor water is placed in a pipe route that connects the outlet side of a non-regenerative heat exchanger 10 of a reactor coolant purification system 12 and the inlet side of a filtration desalter 11. A device 13 for measuring the concentration of Fe/Cr that measures the concentration of Fe clad and Cr is located at the downstream end of the branch pipe. Downstream from the device 13, a Cr/Fe concentration control device 14 and an Fe injection device 15 are placed respectively. The outlet side of the device 15 is linked with a pipe route connecting a condensate filter 5 and a high-pressure condensate pump 6 by way of a pump. Then, the concentration of Fe clad (ferric oxide) in reactor water is kept higher tan during normal operation and the reactor water is circularly operated when a start-up test is conducted after the installation of members. Such operation allows the Fe clad in the reactor water to adhere to the surface of the members.