A Method of Transforming the Prompt Decay Constants α<SUB>l</SUB> into the Static Reactivity ρs

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概要

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• This report describes an analytical method of transforming the prompt decay constants α<SUB>l</SUB> into the static reactivity ρ<SUB>s</SUB>. It has been developed through the use of the time-dependent, two-group diffusion theory ignoring delayed neutrons under several assumptions. A generalized characteristic equation which relates the prompt decay constants to the effective multiplication constant can in general be derived by expanding the static fluxes into kinetic fluxes containing the fundamental and higher modes, and several approximated formulas for this equation have been obtained with the ap-plication of certain conditions. In particular, a formula that takes into account the change in the generation time -ρ<SUB>d2</SUB>, =(β<SUB>eff</SUB>/α<SUB>c</SUB>){α<SUB>c</SUB>-(G<SUB>α</SUB>/G<SUB>αc</SUB>)α}- is proposed as a most useful method for reactiv-ity measurement. Error evaluation has been performed in regard to several approximate formulas, and some problems involved in numerical calculation have been examined.

• 一般社団法人 日本原子力学会の論文

著者

• SUNAKO Katsuhiko

  Tokai University

• AMANO Fumio

  Electrotechnical Laboratory (MITI)

関連論文

• A Method of Transforming the Prompt Decay Constants αl into the Static Reactivity ρs
• Approximate Solution of One-Point Reactor Kinetic Equations for Arbitrary Reactivities

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