DETAILED NEUTRONIC MODELLING OF THE CROCUS RESEARCH REACTOR USING APOLLO3? TRANSPORT CODE

摘要

The deterministic transport code APOLLO3? developed at CEA was used to setup the2D and 3D neutronic models of the zero-power, water-moderated experimental reactorCROCUS, operated by Swiss Federal Institute of Technology in Lausanne, in order toverify the computational methodology and apply it to the interpretation of experimentsconducted under the CORTEX European project related to neutron noise measurementsin which CEA participates. The variants of the self-shielding calculation based on finestructure method were analysed and a fully heterogeneous 2D description of the reactoris tested with different discretisation options using the method of characteristics. Thehomogeneous model intended for the discrete ordinates, short characteristic calculationis also analysed with the emphasis on the production of equivalent cross sections. Thereaction rates preserving equivalent cross sections are set on the basis of the whole 2Ddomain used as reference homogenisation problem.