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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 $$gamma$$ 47 groups) for shielding. We also examine the self-shielding correction for unresolved resonances. Neutron and $$gamma$$ 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.

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