ボルツマン輸送方程式の数値積分による中性子平板問題の解析

概要

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The EOS method for the direct numerical integration of the time independent Boltzmann transport equation in slab geometry has been developed. The EOS-2 code is prepared for the NEAC 2206 computer for calculation of neutron penetration problems. This paper presents the treatment of mathematical procedures of neutron problems and some results of practical neutron penetration problems intending the description to be self contained. From a comparison of neutron spectra obtained by the EOS-2 code with one from the moments, this method seems to provide a correct treatment of neutron attenuation in a slab. The calculation of angular spectra of neutrons with 0°angle in water agrees well with the measurement of the Bulk Shielding Reactor 1. The calculated neutron spectrum in polyethylene layers disagrees with the measurement in USSR at deep penetrations. This may be attributed in part to the difference in calculational and experimental angular distribution of source. As an example of double layer problem energy spectra in a beryllium oxide-water layer with plane isotropic fission source is illustrated.
独立行政法人海上技術安全研究所の論文
1966-12-23