Abstract
Possibility of three-stage fuel option is studied to enhance VVER-1200 reactor to use thorium resources for proliferation resistance without modifying the conventional fuel assembly. As stage-1, conventional UO2 is used as a fuel and Pu isotopes are retrieved from the spent fuel after burning 60 GWd/t and 10 years cooling. Retrieved Pu isotopes are used along with Th as fuel of stage-2. After 10 years cooling, 233U and 232Th are retrieved from the spent fuel of stage-2 and used as a fuel for stage-3. Stage-3 fuel can solely be prepared from the discharged fuel of stage-2. Stage-1 and 3 show a close tendency for K-inf, power peaking factor, fuel temperature, void coefficient, and neutron spectrum than stage-2. Spent fuel of stage-3 contains the least amount of plutonium, minor actinides (Am, Cm, Np), and long lived fission products, which will play an important role for proliferation resistance and spent fuel handling.
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