Ceric acid decontamination of nuclear reactors

Details Ceric acid decontamination of nuclear reactors Ceric acid decontamination of nuclear reactors

1985-11-26

1987-04-14

Kyle, Deborah L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 10, 376310, 376309, 252626, C23G 102, C21C 1942, G21F 900

Patent

active

046575960

ABSTRACT:
Disclosed is a method of decontaminating the metal surfaces in the cooling system of a nuclear reactor by contacting the metal surfaces with an aqueous solution containing about 0.5 to about 3% of a ceric acid which can be tetrasulfato ceric acid, hexasulfamato ceric acid, hexaperchlorato ceric acid, or mixtures thereof, and about 1 to about 5% of an inorganic acid that forms a complex with the ceric acid.
The cerium III in the aqueous solution can be oxidized to cerium IV to increase the life and effectiveness of the solution. After oxidation, the aqueous solution can be passed through a hydrogen form cation exchange column to remove metal ions. If the aqueous solution contains uranyl or plutonyl ions these can be recovered by extraction for use in making fuel.
Also disclosed is a decontaminating solution of water containing about 0.5 to about 3% of a ceric acid which can be tetrasulfato ceric acid, hexasulfamato ceric acid, hexaperchlorato ceric acid, or mixtures thereof, and about 1 to about 5% of an inorganic acid that forms a complex with the ceric acid.

REFERENCES:
patent: 3326811 (1967-06-01), Healy
patent: 3549419 (1970-12-01), Stiles
patent: 3664870 (1972-05-01), Oberhofer et al.

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