Benchmark tests of principal fissile nuclide data in jendl-3 with simple fast critical assemblies

Akira Hasegawa, Tsuneo Nakagawa, Yasuyuki Kikuchi, Dongfeng Tian

Research output: Contribution to journalArticlepeer-review


A series of benchmark tests was made to check the neutron nuclear data of main fissile nuclides (239Pu, 236U and 233U) of JENDL-3 for fast reactors. A total of nine critical assemblies were analyzed. They are assemblies of single material, high enrichment and simple geometry with small volume and therefore suitable for nuclear data testing. Criticality calculation was made by ANISN with S16P5 using the VITAMIN-J 175-energy-group. Discussions are made on ken, spectral indices at core center and leakage spectra. From the study, a problem was pointed out relating to the interpolation of secondary-neutron energy distributions for threshold reactions near the threshold energy point adopted in the original JENDL-3 and its remedy was proposed. By the benchmark tests of thus revised JENDL-3 (JENDL-3.1), it was shown that integral experiments for 239Pu and 235U cores were reproduced quite satisfactorily. On the contrary, it was revealed that large deviations for 233U cores from the experiment were due to uncertainties of the fission spectrum and the inelastic scattering cross sections, In the present work, sensitivity of “a” parameter (level density parameter) of Madland-Nix's fission spectrum formula to the integral data was extensively studied. Some recommendations are made to improve JENDL-3.1.

Original languageEnglish
Pages (from-to)1087-1098
Number of pages12
Journaljournal of nuclear science and technology
Issue number11
Publication statusPublished - 1993
Externally publishedYes


  • JENDL-3
  • Madland-Nix's fission spectra
  • accuracy
  • benchmarks
  • cross section
  • fast reactors
  • k eff
  • leakage spectra
  • neutrons
  • nuclear data
  • plutonium-239
  • spectral index
  • uranium-233
  • uranium-235

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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