Method and device for controlling the pH of the cooling water of a pressurized water nuclear reactor.

摘要

1. Process for the regulation of the pH of the cooling water of a pressurised-water nuclear reactor, this high temperature, high pressure cooling water containing, in addition to certain unavoidable impurities, boric acid in amounts varying with time, and also a conditioning base, characterised by the fact that : the boric acid concentration of the cooling water and one of two parameters, namely either the pH at ambient temperature or the conditioning base concentration of the cooling water, are continuously measured, the conditioning base concentration of the cooling water, which is necessary to obtain a high temperature pH value of the cooling water equal to a predetermined value, is calculated from the boric acid concentration and the second parameter (pH at ambient temperature or conditioning base concentration), the value of the conditioning base concentration necessary for obtaining the desired high temperature pH is compared with the actual measured or calculated value of that concentration in the cooling water, and that, according to the case where the difference between the necessary concentration and the actual concentration is higher or lower than two predetermined limits : the amount of conditioning base to be added to or removed from the cooling water in order to obtain the desired concentration is calculated, and conditioning base is injected into or taken from the cooling water in order to introduce or remove the calculated amount of conditioning base.