A STUDY OF LEAKAGE-CORRECTED TWO-STEP METHOD BASED ON THE NODAL EQUIVALENCE THEORY FOR FAST REACTOR ANALYSIS

The conventional two-step method based on the generalized equivalence theory (GET) cannot be directly applied to fast reactor analysis since assumption of space-energy separability is not very valid due a relatively long neutron mean free path. This study aims develop leakage-corrected for with aid albedo-corrected parameterized constants (APEC) method. critical idea APEC correct homogenized group (HGCs) including discontinuity factors (DFs) during nodal calculation through predetermined functions. functions are functionalized in terms normalized leakage parameters such as current-to-flux (CFR) ratio so that they can cross-sections (XSs) and by reflecting in-situ information analysis. feasibility APEC-corrected was investigated solving 5-group diffusion equations two-dimensional sodium-cooled 6-triangle finite difference HGCs fuel assemblies were determined using continuous-energy Monte Carl code, assembly also introduced each hexagonal assembly. First all, it demonstrated simple FDM scheme could reproduce reference quantities GET. And formulated solutions evaluate functional both XSs DFs. Then, smaller color-set problem defined determine practical original benchmark, various numerical evaluations performed k-eff value power distribution.