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

A nuclear power plant which is a boiling water type, comprising:

• a reactor pressure vessel;
• a turbine;
• a steam condenser;
• a feed water pipe through which water in the steam condenser is replenished to the reactor pressure vessel;
• a reactor water cleanup system pipe through which water in the reactor pressure vessel is cleaned;
• a reactor water cleaning unit connected to the reactor water cleanup system pipe;
• a hydrogen injecting unit which injects hydrogen into water to be supplied to the reactor pressure vessel;
• and
• a noble metal injecting unit which injects a noble metal compound into water in a line of the 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.

A nuclear power plant comprising:

• a reactor pressure vessel in which a reactor water is held;
• a reactor container which includes the reactor pressure vessel therein;
• a feed water pipe through which a condensed water is supplied into the reactor pressure vessel;
• a reactor water cleaning unit which cleans the reactor water;
• a reactor water cleanup system pipe which has the reactor water cleaning unit;
• a noble metal injecting unit which injects a liquid containing a noble metal into the reactor water;
• and
• a heat exchanger which is disposed on the reactor water cleanup system pipe and uses a cleaned reactor water to cool the reactor water that has not yet been cleaned,
• wherein the noble metal injecting unit is connected to a pipe between an outlet of the reactor water cleaning unit, and the heat exchanger.

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.