APPLYING FULL SETS OF MULTIGROUP CELL CHARACTERISTICS OBTAINED BY MCU CODE IN FINITE-DIFFERENCE CALCULATIONS OF VVER NEUTRON FIELD

Gorodkov S.S., Kalugin M.A, NRC “Kurchatov institute”, Russia

24th Symposium of AER on VVER Reactor Physics and Reactor Safety (2014, Sochi, Russia)
Reactor physics calculations, experiments and code validation

Abstract

APPLYING FULL SETS OF MULTIGROUP CELL CHARACTERISTICS OBTAINED BY MCU CODE IN FINITE-DIFFERENCE CALCULATIONS OF VVER NEUTRON FIELD
Gorodkov S.S., Kalugin M.A.
NRC “Kurchatov institute”, Moscow, Russia
ABSTRACT
Until recently it was possible to obtain with MonteCarlo approach only cell average crossections, which can be used either in finite difference calculations or as a benchmark values for some approximate spectral codes. Now MonteCarlo based MCU code can tally certain functionals, reliably interpreted as cell average diffusion coefficients. Finite-difference calculations with obtained in such a way full sets of cell characteristics can be then compared with benchmark MonteCarlo solution, providing reliable knowlege on quality of operative code under consideration. As an example of such study 1-, 2-, 4-, 8- and 12-group finite difference calculations of VVER model fuel assembly are compared with MonteCarlo solution. The quality of fictitious border cell transformation to the regular hexagon form was as well examined.

Presentation / full paper