EFFECT OF SELECTION OF CALCULATION PARAMETERS IN DISCRETE ORDINATE CODE DOT3.5 FOR ANALYSES OF FUSION BLANKET INTEGRAL EXPERIMENTS IN JAERIUSDOE COLLABORATIVE PROGRAM

The effect of the parameters selected for discretization in the discre te ordinate code DOT3.5 on the calculated results was examined for neu tronics analysis of the JAERI-USDOE collaborative program on fusion bl anket neutronics. The parameters examined were the group structure and Legendre expansion for the cross-section library, and the sizes of th e directional and spatial meshes. The group structure and the mesh siz e were more effective for high energy and for low energy neutrons resp ectively. From these calculation surveys, the recommended parameters f or the DOT3.5 code can be obtained for application to fusion blanket d esign calculations.