International Conference on Nuclear Data for Science and Technology 2010
J. Korean Phys. Soc. 59, 1092-1095
Paper ID: ND-1441
DOI: 10.3938/jkps.59.1092
PACS: 25.40.Lw, 28.20.Fc, 24.30.-v
Insufficient Self-shielding Correction in JSSTDL-300
C. Konno1, K. Ochiai1 and S. Ohnishi1
1 Fusion Research and Development Directorate, Japan Atomic Energy Agency, Ibaraki, 319-1195, Japan
Abstract
JSSTDL-300 is a multigroup library for shielding applications produced from JENDL-3.2. The self-shielding correction in JSSTDL-300 is probably inadequate due to the following two reasons, 1) the weighting flux of Legendre order 0 is applied to all Legendre orders, 2) the f-table of the scattering matrix is the same as that of the elastic scattering. Thus we examined the effects of these problems through a simple benchmark test, the model of which consisted of an aluminum, iron, nickel or copper sphere of 1 m in radius with a 20 MeV neutron source in the center. Neutron spectra in the sphere were calculated with ANISN and they were compared with those obtained with MCNP4C. It was found out that the effects were dependent on materials and were the largest for copper. Adequate f-table data and weighting flux should be adopted in generation of multigroup libraries.
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