Method for Relieving Corrosive Environment of Boiling Water Reactor, Nuclear Power Plant, and Method for Injecting Noble Metal Which is Carried Out in Nuclear Power Plant

Abstract

The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water. Thus, when a noble metal is injected into a boiling water reactor, the noble metal can be restrained from adhering onto a pipe for an injection and other pipes, and thereby can increase the amount of the noble metal to be injected into a cooling water in a reactor pressure vessel.

What is claimed is: 
     
         1 . A method for injecting a noble metal which is carried out in a nuclear power plant,
 the method comprising the steps of:   sending a part of a reactor water filled into a reactor pressure vessel of the nuclear power plant to an outside of a reactor container of the nuclear power plant;   cooling and cleaning the reactor water; and   injecting a liquid containing a noble metal into the reactor water subsequently,   wherein the reactor water sent to the outside of the reactor container is cooled, before cleaned, with the cleaned reactor water into which the liquid containing the noble metal has been injected.   
     
     
         2 . The method for injecting the noble metal which is carried out in the nuclear power plant according to  claim 1 ,
 wherein the reactor water into which the liquid containing the noble metal has been injected is mixed with a condensed water to be sent to the reactor pressure vessel outside the reactor container.   
     
     
         3 . The method for injecting the noble metal which is carried out in the nuclear power plant according to  claim 1 ,
 wherein the noble metal is platinum.   
     
     
         4 . The method for injecting the noble metal which is carried out in the nuclear power plant according to  claim 1 ,
 wherein the part of the reactor water into which the noble metal is injected has a temperature of 30 to 70° C.   
     
     
         5 . The method for injecting the noble metal which is carried out in the nuclear power plant according to  claim 1 ,
 wherein the part of the reactor water into which the noble metal is injected has a hydrogen concentration of 0.1 ppm or less.