Theoretical Analysis on Time-Dependent Energy Spectra of Neutrons in a Small Graphite Assembly
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概要
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A theoretical study was carried out on the time-dependent neutron spectrum in a small graphite assembly into which the neutron pulses were injected through a premoderator layer of polyethylene. Numerical analyses were performed by means of the usual time-step method, as well as by the spatial mode expansion time-step and two-region difference equation methods.<BR>It was verified that addition of the pre-moderator does not substantially affect the space-time-dependent spectral behavior of neutrons in a graphite system of dimensions adopted in current experimental arrangements. <BR>A strong space dependence of the time-dependent spectra was observed in the form of spectral hardening in increasing distance from source, which was termed "propagation hardening". The space-time-dependence and neutron trapping at Bragg peak energies appearing on the measured spectra were well reproduced by both the spatial mode expansion time-step and two-region calculations.
- 一般社団法人 日本原子力学会の論文
著者
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Fujita Yoshiaki
Research Reactor Institute Kyoto University
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SUMITA Kenji
Faculty of Engineering, Osaka University
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TAKAHASHI Akito
Faculty of Engineering, Osaka University
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AIZAWA Otohiko
Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology
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SAKAMOTO Shigeyasu
Faculty of Engineering, Tokai University
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FUJITA Yoshiaki
Research Reactor Institute of Kyoto University
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