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Platinum Oxide Colloidal Solution, Manufacturing Method Therefor, Manufacture Apparatus Thereof, and Method of Injection Noble Metal of Boiling Water Nuclear Power Plant

Inactive Publication Date: 2014-05-22
HITACHI-GE NUCLEAR ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes a method for creating a platinum oxide colloidal solution with low impurities and stable particles dispersed in water. This solution prevents clogging of the injection pipe and prevents impurities from mixing into the reactor water, resulting in higher electric conductivity. Additionally, the method also prevents the deposition of noble metals on the inner surfaces of the pipes and allows for an increased amount of noble metal to be injected into the cooling water in the reactor pressure vessel.

Problems solved by technology

Therefore, the stress corrosion cracking progresses remarkably as the oxygen concentration and hydrogen peroxide concentration in the reactor water increase.

Method used

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  • Platinum Oxide Colloidal Solution, Manufacturing Method Therefor, Manufacture Apparatus Thereof, and Method of Injection Noble Metal of Boiling Water Nuclear Power Plant
  • Platinum Oxide Colloidal Solution, Manufacturing Method Therefor, Manufacture Apparatus Thereof, and Method of Injection Noble Metal of Boiling Water Nuclear Power Plant
  • Platinum Oxide Colloidal Solution, Manufacturing Method Therefor, Manufacture Apparatus Thereof, and Method of Injection Noble Metal of Boiling Water Nuclear Power Plant

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embodiment 1

[0053]A method of manufacturing platinum oxide colloidal solution according to embodiment 1 which is a preferable embodiment of the present invention will be explained by referring to FIGS. 1, 2, and 3.

[0054]FIG. 1 shows manufacturing processes of the platinum oxide colloidal solution.

[0055]The manufacturing processes of the platinum oxide colloidal solution include three processes.

[0056]An aqueous solution of a alkali hexahydroxo platinate (hexahydroxoplatinate salt) at a predetermined concentration is produced (step S101). The metallic ions (cations such as sodium ions and potassium ions are removed from the aqueous solution (step S102) (an ion exchange process). Gamma rays are irradiated to the suspension generated due to removal of the metallic ions (step S103) (a colloidal generation process).

[0057]In step S101, the aqueous solution of the alkali hexahydroxo platinate is produced. When the alkali hexahydroxo platinate is obtained as a solid, the solid is dissolved in pure water...

embodiment 2

[0087]The manufacturing method of the platinum oxide colloidal solution according to 2 which is another preferable embodiment of the present invention will be explained by referring to FIG. 8. In the manufacturing method of the present embodiment, the platinum oxide colloidal solution can be manufactured continuously.

[0088]FIG. 8 shows a structure of a manufacturing apparatus of the platinum oxide colloidal solution used for the manufacturing method of the platinum oxide colloidal solution of the present embodiment and the manufacturing apparatus can manufacture continuously the platinum oxide colloidal solution.

[0089]A platinum oxide colloidal solution manufacturing apparatus 60 for manufacturing the platinum oxide colloidal solution is provided with a vessel 61 for storing the aqueous solution of the alkali hexahydroxo platinate, a hydrogen form cation exchange resin tower (cation exchange resin tower) 63 filled with the hydrogen form cation exchange resin, a reaction vessel 64, a...

embodiment 3

[0095]The inventors examined noble metal adsorption phenomenon to suppress the adsorption of the noble metal on the inner surface of the injection pipe. As a result, the following is found. An inner surface of an injection pipe of a noble metal injection apparatus connected to a pipe (for example, a water feed pipe, and a reactor purification system pipe, etc.) connected to a reactor pressure vessel is covered with an iron oxide while solution including noble metal is injected into the pipe connected to the reactor pressure vessel through the injection pipe. As a result, the inner surface of the injection pipe is charged negatively when it makes contact with neutral pure water (pH 7). When a neutral aqueous solution with a noble metal dissolved flows through the injection pipe, cations (for example, Pt4+) of the noble metal in the aqueous solution are electrostatically adsorbed to the negatively charged inner surface of the injection pipe.

[0096]Material is charged positively when it...

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Abstract

An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.

Description

CLAIM OF PRIORITY[0001]The present application claims priority from Japanese Patent application serial no. 2012-253078, filed on Nov. 19, 2012 and Japanese Patent application serial no. 2013-035424, filed on Feb. 26, 2013, the content of which is hereby incorporated by reference into these application.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to a platinum oxide colloidal solution, a manufacturing method therefor, a manufacture apparatus thereof, and a method of injecting a noble metal of a boiling water nuclear power plant.[0004]2. Background Art[0005]In a boiling water nuclear power plant, it is important from the viewpoint of improving operation rate of the boiling water nuclear power plant to suppress stress corrosion cracking of reactor internals installed in a reactor pressure vessel and pipes (for example, recirculation pipes) connected to the reactor pressure vessel.[0006]Regarding the stress corrosion cracking, the following is k...

Claims

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Application Information

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IPC IPC(8): G21C15/28B01J37/34B01J31/28C02F1/42B01J23/42
CPCB01D15/362B01J39/04B01J39/18G21C17/0225Y02E30/30B01J13/0047B01J19/082B01J23/42B01J37/344B01J2219/0877B01J2219/12C02F1/42G21C15/28
Inventor ISHIDA, KAZUSHIGETACHIBANA, MASAHIKOWADA, YOICHIOTA, NOBUYUKI
Owner HITACHI-GE NUCLEAR ENERGY LTD
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