Process for the Removal of Radioactive Corrosion Products from the Inner Surfaces of a Nuclear Reactor

摘要

A solution is added to the coolant which has a higher oxygen concentration than water and causes the dissolution of the corrosion products in the coolant; moreover that the coolant pressure is reduced to atmospheric pressure, and the coolant containing the corrosion products is passed through a demineraliser for the removal of the products, with the coolant decontaminated in this manner being returned to the reactor cooling circuit. The oxygen solution mentioned contains essentially hydrogen peroxide. The hydrogen peroxide is introduced as a solution in water at a rate of about 0.5 1/min into a reactor coolant flow of about 100 1/min, and the coolant is circulated until a concentration of about 300 ppM is achieved at the point of introduction, and subsequently the rate of introduction is reduced and controlled in such a manner a residual concentration of 2 ppM of hydrogen peroxide is produced throughout the coolant circulating in the reactor. The pressure of the coolant is reduced to about 28 kp/cm exp 2 and its temperature to about 60 degree C before the oxygen-containing solution is added to the coolant.