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Method for nuclear power plant decontamination

A nuclear power, oxide layer technology, applied in nuclear power generation, nuclear engineering, nuclear engineering problems, etc., can solve problems such as the accumulation of radioactive substances in water-cooled nuclear reactors, and achieve the effect of inhibiting further accumulation and reducing the level of radioactivity

Inactive Publication Date: 2002-01-09
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The main problem with water-cooled nuclear reactors is the accumulation of radioactive material on the structural parts of the reactor system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The following examples are given to illustrate the invention.

[0018] A small stainless steel autoclave is used, and a sample for forming an oxide film in high-temperature water is placed in it. Using the autoclave used in these experiments, experiments on corrosion samples were previously carried out under similar conditions in the absence of zinc in the water. Under these conditions, after prolonged exposure (thousands of hours), a very thick, firmly adherent black oxide layer, which cannot be removed by wiping, is obtained on the inner surface.

[0019] During the process of stopping the experiment and taking out the samples, it was noticed that the inner surface of the autoclave treated according to the method of the present invention was lighter in color. Wipe the surface to remove some of the dark outer surface oxide, leaving a dark brown oxide inner film. The autoclave runs for about 2,000 hours on hot water containing zinc. A drop in zinc concentration was a...

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PUM

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Abstract

Method effecting decontamination of metal components carrying an oxide layer in a nuclear powered water cooled reactor wherein a low concentration of zinc ions is introduced into the water to cause loosening and removal of the oxide layer from the metal surface.

Description

[0001] The present application relates to methods for decontaminating nuclear power plant systems. More specifically, the present invention relates to the use of small amounts of zinc to modify the properties of oxide films present on the inner walls of nuclear reactors and the surfaces of piping systems to facilitate removal therefrom 60 Radioactive substances such as Co. Background of the invention [0002] A major problem with water-cooled nuclear reactors is the accumulation of radioactive material on structural parts of the reactor system. For example, during a reactor shutdown, workers are exposed to radiation emitted from interior walls and piping surfaces, where accumulation of radioactive material retained in the form of oxide films is the main source of exposure. [0003] radioactive cobalt ( 60 The accumulation of Co) within the circulating piping systems of nuclear power reactors, including boiling water reactors, is a major source of irradiation, especially duri...

Claims

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Application Information

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IPC IPC(8): G21F9/28G21C17/022G21C19/28
CPCG21C17/022G21F9/28G21Y2002/501G21C19/28Y02E30/30
Inventor W·J·马布勒G·E·彼得森C·P·鲁伊斯R·N·罗宾逊
Owner GENERAL ELECTRIC CO