Breed and Burn fast reactors are very attractive reactor concept. It can achieve very high burnup without reprocessing facility using depleted uranium or natural uranium as the fuel for the reactor. To achieve criticality in the equilibrium burnup condition improvement of neutron economy is the essential issue. The feasibility of the reactor can be discussed based on the neutron balance of a fuel assembly from the loading to the discharge. There is a possibility that cladding materials give a lot of impact on the neutron balance. The purpose of study was to make clear the impact of cladding material on the neutron balance. In the previous study, HT-9 and ODS were assumed as the cladding material. The thickness was decided based on an example of previous fuel design. In the study, the impact of cladding material on the neutron balance was analyzed by changing the cladding material and the thickness. The analysis results showed the difference of neutron balance between HT-9 and ODS is negligible. Significant improvement of neutron balance can be expected by the reduction of thickness of cladding, which gives the same effect by the reduction of the density of cladding material. The change of burnup characteristics in whole core analysis was discussed also by the change of density of cladding.
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|Affiliation/Organization||Tokyo Institute of Technology|