Method of compensating the variations of the reactivity of a pressurized-water nuclear reactor, the moderator liquid and the reactor for implementing said method

摘要

1,087,386. Controlling reactors. COMMISSARIAT A L'ENERGIE ATOMIQUE. Sept. 23, 1966 [Oct.13, 1965], No. 42659/66. Heading G6C. In a heavy water moderated reactor, xenon and samarium poisioning are separately compensated. Lithium and boron compensate respectively for the xenon and samarium effects and are added, as neutron absorbers in solution, to the moderator Water. The lithium is extracted continually during an initial stage of a few days while the boron is removed over a period of one month, the removal rates being related to the poisoning rates of xenon and samarium respectively. The lithium is extracted by the cationic resin purifier circuit through which the moderator is circulated continuously and the boron, which remains in solution, is extracted in a basic ion-exchange resin circuit. The lithium and boron are combined in single soluble salt, lithium tetraborate.