Corrosion Product Solubility in the PWR Primary Coolant

摘要

The solubility of main corrosion products encountered in PWR primary circuits (magnetite and nickel ferrite) was determined between 250 and 350 deg C. It was found that, in the prevailing primary circuit chemical conditions, the solubilities of magnetite and nickel ferrite are at a minimum as predicted by the POTHY code at temperatures around 300 deg C. The consequences of the position of this minimum and of the algebraic value of the slope as a function of temperature on the reactor contamination and on the personnel irradiation are studied with the aid of the PACTOLE code. An attempt to determine the best range of pH for the primary coolant conditionning is performed. (ERA citation 12:006654)