Nuclear reactor cooling system decontamination reagent...

Details Nuclear reactor cooling system decontamination reagent... Nuclear reactor cooling system decontamination reagent...

G - Physics

21

F

149/12, 150/14

G21F 9/00 (2006.01)

Patent

CA 1165214

ABSTRACT OF THE DISCLOSURE: An improved method for decontaminating the coolant system of water-cooled nuclear power reactors and for re- generating the decontamination solution. A small amount of one or more weak-acid organic complexing-agents is added to the reactor coolant, and the pH is adjusted to form a decon- tamination solution which is circulated throughout the coolant system to dissolve metal oxides from the interior surfaces and complex the resulting metal ions and radio- nuclide ions. The coolant containing the complexed metal ions and radionuclide ions is passed through a strong-base anion exchange resin bed which has been presaturated with a solution containing the complexing agents in the same ratio and having the same pH as the decontamination solution. As the decontamination solution passes through the resin bed, metal-complexed anions are exchanged for the metal-ion-free anions on the bed, while metal-ion-free anions in the solution pass through the bed, thus removing the metal ions and regenerating the decontamination solution.

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