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[en] Due to the complexity of Boltzmann transport equation, for the computational modelling there is a need to simplify operators in the equation. One well known approximation is diffusion theory, which is often used for numerical calculations. This approximation describes the migration of neutrons in space. It also eliminates few challenging variables, such as neutrons angular distribution and in our case energy variability (only two energy groups of neutrons are considered). This simplification has also its limitations and the diffusion theory is applicable in the environment without large local absorbers. The limitations are: environment is homogeneous, steady state type of analysis (∂φ/∂t = 0), neutron scattering is isotropic. The influence of heterogeneousness is decreasing with larger migration area of neutrons and therefore. Diffusion theory is very suitable for fast calculations and it is used during development of theoretical reactor design. The successful application of program code was demonstrated. It has also its limitations but it provides relevant information when these limitations are taken into account by researcher. Development of such program codes helps to increase knowledge level and it directly influences nuclear safety. It also allows solving specific issues which are irresolvable by commercial codes. In the future, we have a plan to enlarge geometry into 2 dimensions. (authors)
Source
Vajda, J. (ed.) (Institute of Nuclear and Physical Engineering, Institute of Electronics and Photonics, Faculty of Electrical Engineering and Information Technology, Slovak Univ. of Technology, Bratislava (Slovakia)); Jamnicky, I. (ed.) (Dept. of Physics,, Faculty of Electrical Engineering, University of Zilina, Zilina (Slovakia)); Institute of Nuclear and Physical Engineering, Institute of Electronics and Photonics, Faculty of Electrical Engineering and Information Technology, Slovak Univ. of Technology, Bratislava (Slovakia); Alumni Club of the Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Bratislava (Slovakia); Institute of Physicsand Institute of Aurel Stodola, Faculty of Electrical Engineering, University of Zilina, Zilina (Slovakia); Slovak Physical Society, Bratislava (Slovakia); Institute of Physics, Slovak Academy of Sciences, Bratislava (Slovakia); Slovak Physical Society, Bratislava (Slovakia). Funding organisation: Sponsors: Slovenske Elektrarne, a. s., Bratislava (Slovakia); 217 p; ISBN 978-80-227-4179-8; 
; 27 Jun 2014; p. 320-323; APCOM 2014: 20. international conference on applied physics of condensed matter; Strbske Pleso (Slovakia); 25-28 Jun 2014; GRANT APVV-0123-12; Also available from http://kf.elf.stuba.sk/∼apcom/apcom14/; 2 tabs., 4 figs., 4 refs.
; 27 Jun 2014; p. 320-323; APCOM 2014: 20. international conference on applied physics of condensed matter; Strbske Pleso (Slovakia); 25-28 Jun 2014; GRANT APVV-0123-12; Also available from http://kf.elf.stuba.sk/∼apcom/apcom14/; 2 tabs., 4 figs., 4 refs.