Analysis of First-Harmonic Eigenvalue Separation Experiments on KUCA Coupled-Core.

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  • KATO Yoshiki
    Department of Nuclear Engineering, Graduate School of Engineering, Osaka University Shikoku Electric Power Co.
  • YAMAMOTO Toshihisa
    Department of Nuclear Engineering, Graduate School of Engineering, Osaka University
  • KITADA Takanori
    Department of Nuclear Engineering, Graduate School of Engineering, Osaka University
  • TAKEDA Toshikazu
    Department of Nuclear Engineering, Graduate School of Engineering, Osaka University
  • HASHIMOTO Kengo
    Atomic Energy Research Institute, Kinki University
  • SHIROYA Seiji
    Research Reactor Institute, Kyoto University
  • UNESAKI Hironobu
    Research Reactor Institute, Kyoto University
  • AIZAWA Otohiko
    Atomic Energy Research Institute, Musashi Institute of Technology

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  • Analysis of First-Harmonic Eigenvalue S

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Abstract

The first-harmonic eigenvalue separation, the difference between the fundamental and the first order eigenvalues of the higher harmonic neutron transport equations, which were measured at the Kyoto University Critical Assembly (KUCA) has been analyzed. A method was proposed to calculate the first order eigenvalue based on the discrete ordinate method. The 3-D effect, energy group effect, mesh size effect, and transport effect were investigated. Among these effects, the transport effect was significant and when it was taken into account, the calculated eigenvalue separation approached the measured value on the KUCA coupled-core.

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