Overview of the validation of a new 3-D neutronics model in APROS
21st Symposium of AER on VVER Reactor Physics and Reactor Safety (2011, Dresden, Germany)
Reactor physics experiments and code validation
Abstract
APROS – Advanced PROcess Simulation environment ? is a widely used simulation tool for
nuclear power plant modelling. Originally, the three-dimensional neutronics calculation has
been based on a model using the difference method. The model was originally intended also
for power plant simulator applications, where it fits well because of its speed. For safety
analysis purposes, however, a new model was considered to be important improvement to
conform the increasing accuracy requirements. A sophisticated nodal model used already in
HEXTRAN and TRAB-3D was decided to be an implemented into APROS. The model was
reprogrammed into APROS with some improvements and thus, an extensive validation
program was necessary to prove the correct behaviour of the model. Since the model is based
on already-validated HEXTRAN and TRAB-3D, the validation is mainly based on
comparison of the results by APROS to them. The hexagonal part of the model has already
been validated widely and for the square-lattice part, it is undergoing. In the paper, summary
of the latest phases of the implementation and validation results of the model are presented.