Theoretical Treatment of the Asymptotic Behavior of Fission Product Decay Heat toward Very Short Cooling-Time

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概要

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• The asymptotic behavior of the FP decay heat has been studied toward the very short cooling-time range down to 0.1 s after a fission event. For this purpose we apply the second generation of the gross theory of β-decay and estimate the decay properties of short-lived FP nuclides. In order to reproduce the recent measurements adequately, we introduce a new parameter named the Q00-factor, and optimize it in terms of the calculation of the half-lives and the average β- and γ-ray energy releases per decay (Eβ- and Eγ-values). The favorable value of the Q00-factor is 1.0 for the half-lives and about 0.4 for the Eβ- and Eγ-values. The Eβ- and Eγ-values thus calculated for the short-lived nuclides, whose β-decay Q-values are larger than 3–4 MeV, guarantee a good reproduction of asymptotic behavior of the measured decay heat toward the very short cooling-time range. Adoption of the present calculation to data files for the summation calculations is recommended from a practical point of view.

• 一般社団法人 日本原子力学会の論文

著者

• YOSHIDA Tadashi

  Faculty of Engineering, Musashi Institute of Technology

• Tachibana Takahiro

  Advanced Research Institute For Science And Engineering Waseda University

• Yoshida Tadashi

  Faculty Of Engineering Musashi Institute Of Technology

関連論文

• Simultaneous Evaluation of Fission Cross Sections of Uranium and Platonium Isotopes for JENDL-3.3
• Pandemonium Problem in Fission-Product Decay Heat Calculations Revisited
• Q_ Measurement of^La
• Possible Origin of the Gamma-ray Discrepancy in the Summation Calculations of Fission Product Decay Heat
• Production of Pa-U Fuel with Proliferation Resistance by 14MeV Neutron for Long-life Core
• Potential of ^Pa for Gas Cooled Long-life Core
• Theoretical Treatment of the Asymptotic Behavior of Fission Product Decay Heat toward Very Short Cooling-Time

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