16.4 Transmutation Calculation
Transmutation performances of the hydride MA target and related core features in
FBRs have been evaluated with the method shown in Table 16.2. A threedimensional continuous energy Monte Carlo Code MVP [9] and MVP-BURN
[10] are used as burn-up calculations for evaluating the transmutation of MAs.
The cross-section library applied in the calculations is JENDL-4.0, which is
processed to be adjusted to the MVP code. In the burn-up calculation, the
prediction-correction method is employed to improve accuracy with millions of
neutron histories for the criticality calculation, where the accuracy of Eigen value is
about 0.04 %.
Table 16.1 Major core
specifications for minor
actinides (MA) transmutation
Reactor type
Fast breeder reactor
Cooling system
Sodium cooled (loop-type)
Thermal output
714 MW
Electrical output
280 MW
Fuel
Mixed oxide
Plutonium enrichment
Inner/outer 16/21(% Pu fission)
Average burn-up
80,000 MWd/t
Cladding material
SS 316
Fig. 16.3 Core layout with hydride targets
172
K. Konashi and T. Yokoyama