Neutron Flux Reconstruction ina Hexagonal Cassete - Theory and Implementation into the Code DYN3D/H1.1

The reconstruction of neutron flux density and thermal power density inside the hexagonal cassette of VVER type is described. The method of successive smooting combined with following analytical solution was used for the detailed pointwise evaluation of neutron fluxes and thermal power densities distributions in the cassette interior. The program module RECON based on the above mentioned method is presented. Results generated by the 3-dimensional reactor dynamic code DYN3D are used as input data for this subprogram. RECON can be used for methodical off-line investigation or to be implemented into the code DYN3D. This implementation is demonstrated.