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

Patent metadata

Field	Value
Publication number	US-10457583-B2
Application number	US-201715418853-A
Country	US
Kind code	B2
Filing date	Jan 30, 2017
Priority date	Mar 31, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

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.

First claim

What is claimed is:

1. A method for relieving a corrosive environment of a boiling water reactor, the method comprising the steps of:
heating a sodium hexahydroxoplatinate solution to 190° C. or higher to produce a platinum oxide colloid, then
injecting hydrogen and the platinum oxide colloid into a water line to be supplied into the reactor pressure vessel during power generation of the boiling water nuclear, and
injecting oxygen or hydrogen peroxide in the water line, wherein
a concentration of the injected oxygen or hydrogen peroxide in the water line is stoichiometrically higher than the concentration of the injected hydrogen.

2. The method for relieving the corrosive environment of the boiling water reactor according to claim 1 ,
wherein the platinum oxide colloid is injected into the water line downstream of where the oxygen or hydrogen peroxide is injected.

3. The method for relieving the corrosive environment of the boiling water reactor according to claim 1 ,
wherein the sodium hexahydroxoplatinate solution is heated to 280° C. or higher to produce the platinum oxide colloid.

Assignees

• Hitachi Ge Nuclear Energy Ltd

Inventors

• Ishida Kazushige
• Wada Youichi
• Tachibana Masahiko
• Oota Nobuyuki
• Shimizu Ryosuke
• SASAKI Mayu

Classifications

• C02F2303/08

  Corrosion inhibition · CPC title

• C02F2103/023

  Water in cooling circuits · CPC title

• G21C17/0225

  Chemical surface treatment, e.g. corrosion (corrosion prevention in presence of water from scale removal or by modification of the properties of the liquid C02F5/00; inhibiting corrosion by adding corrosion inhibitors C23F11/00) · CPC title

• C02F1/727

  using pure oxygen or oxygen rich gas · CPC title

• C02F1/722

  Oxidation by peroxides · CPC title