Abstract

The pressurized heavy water reactors make use of heavy water in moderator and in primary heat transport system.  The cationic fission products produced during the reactor operation such as Cesium, Strontium, Cobalt, Palladium, Ruthenium and anions Iodide, Iodate, Ruthenate etc. contaminate the heavy water. Columns containing Ion exchange resins in on line are used for purification. In this purification process, the resins pick up activity and ionic impurities. It is imperative to treat the spent resin into innocuous form. Hence an attempt has been made to convert the Iodide containing spent resin into multi atomic anionic forms viz. chlorate, dichromate, permanganate and oxalate forms and study the role of temperature in the exchange reactions. The exchange reactions were found to be endothermic with enthalpies 170.79 KJ/mole for chlorate, 161.59 KJ/mole for dichromate, 119.68 KJ/mole for Permanganate and 83.07 KJ/mole for Oxalate.

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