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.
Highlights
Spent resins are generated in purification of primary heat transport system, moderator system, and spent fuel storage pond water
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
Results indicate that in the conversion of the Iodide form of the resin into multi atomic anionic forms, the equilibrium constant for the exchange reactions increases with temperature favoring the conversion at higher temperature
Summary
Spent resins are generated in purification of primary heat transport system, moderator system, and spent fuel storage pond water. The spent resin containing cationic and anionic fission products is disposed in the radioactivity disposal area without treatment or fixed in cement or in thermosetting polymer as reported (Plecas et al, 2003). The other alternate method, generates new kind of waste solutions and complicates the final disposal as reported (Miriam et al, 1982). It needs handling of concentrated mineral acids and handling off gasses viz. NOX, SO2 etc. Regeneration of spent resin into multi atomic anionic forms renders the handling of the almost non-active resin easy which can be fixed in cement or polymer safely. Results indicate that in the conversion of the Iodide form of the resin into multi atomic anionic forms, the equilibrium constant for the exchange reactions increases with temperature favoring the conversion at higher temperature
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