SLAROM-UF; Ultra fine group cell calculation code for fast reactor, version 20090113 (Translated document)

Hazama, Taira ; Chiba, Go; Sato, Wakaei; Numata, Kazuyuki*

SLAROM-UF is a cell calculation code for fast reactors to produce effective cross sections with high accuracy in practical computing time, taking full advantage of fine and ultra-fine group calculation schemes. The fine group calculation scheme covers the whole energy range in a maximum of 900-group structure. Its group structure is finer above 52.5 keV with a minimum lethargy width of 0.008. Effective cross sections are evaluated based on the Bondarenko method. The ultra-fine group calculation scheme covers the energy range below about 52.5 keV. Its group structure is so fine ( 100,000 groups) as to treat resonance peaks as they are. Effective cross sections are calculated by solving an integral slowing down equation effectively, focusing only on elastic scattering and absorption reactions. Temperature can be specified freely by a user in the input data. The effective cross sections thus obtained are combined to calculate cell averaged cross sections.