Test of AMPX multigroup library for shielding in SCALE6.2.1

Konno, Chikara  ; Tada, Kenichi   

SCALE6.2.1 was released in 2016 and has been used worldwide. It includes new AMPX libraries (multigroup, continuous energy, ORIGEN, etc.) of ENDF/B-VII.0 and ENDF/B-VII.1. Now we investigate whether the self-shielding correction problem for resolved resonances, which was pointed out before, is revised in the AMPX multigroup library (scale.rev12.xn200g47v7.1, neutron 200 groups and 47 groups) for shielding. We also examine the self-shielding correction for unresolved resonances. Neutron and spectra inside an iron or arsenic sphere of 1 m in radius with a 20 MeV neutron source at the center were calculated with a one-dimensional Sn code ANISN. As a result, it was verified that the self-shielding correction of scale.rev12.xn200g47v7.1 for resolved resonances was not still correct. It was shown the self-shielding correction for unresolved resonances was similar to that with FRENDY, not NJOY.