Abstract
Changes in the concentration of boron in the reactor coolant are effected by using a development called a boron thermal-regeneration system (BTRS). Thermal regeneration refers to the use of ion-exchange resins either to retain or to release borate ions as a function of temperature. For the BTRS, the equilibrium capacities of commercial and special anion-exchange resins have been investigated as a function of the degree of cross-linking of the resins. The equilibrium capacity increases as the temperature decreases and depends strongly on the degree of cross-linking, reaching a maximum at ca. 7% of divinylbenzene (DVB). The temperature coefficient of equilibrium capacity of boric acid is also a function of the concentration of the external solution and of the cross-linking, also reaching a maximum at ca. 7% of DVB. Other basic characteristics of anion-exchange resins have been also investigated.
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