Generation and Validation of the WIMS-D5 library Based on JENDL-3.2

Abstract

A WIMS-D5 library based on JENDL-3.2 has been prepared and is being tested against benchmark problems. Several sensitivity calculations for stabililty confirmation of the library were carried out, such as fission spectrum dependency and the self-shielding effects of the elastic scattering cross sections and the self-shielding effects ²⁴⁰Pu and ²⁴²Pu capture cross sections below 4.0 eV. The results of benchmark calculations with the libraries based on JENDL-3.2, ENDF/B-VI.5, JEF-2.2, and the 1986 WIMS-D library were intercompared. The multiplication factors for the thermal lattices are slightly underpredicted by all libraries (up to 1% with ENDF/B-VI.5). The k_eff values with the library based on JENDL-3.2 are slightly higher than those of ENDF/B-VI.5 and JEF-2.2. The spectral indices for the lattices with JENDL-3.2 agree with the measured quantities within the uncertainties of the experiments. The calculated amounts of some isotopes such as ¹⁴⁹Sm, ²³⁷Np, ²³⁸Pu, ²⁴²Cm and ²⁴³Cm show large differences from the measured or reference values.

Keywords:

• WIMS-D5
• library
• benchmark
• ENDF/B-VI.5
• JEF-2.2
• JENDL-3.2
• self-shielding
• fission spectrum
• criticality
• HELIOS
• CASMO-3