Calculation of the effective delayed-neutron fraction and prompt-neutron lifetime in IBR-2M |
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Authors: | Yu. N. Pepelyshev A. D. Rogov L. A. Taiybov Jang Chang Min R. N. Mekhtieva |
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Affiliation: | (1) Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 141980 Moscow, Russian Federation |
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Abstract: | The main parameters of IBR-2M are presented: the effective delayed-neutron fraction βeff and the promptneutron lifetime τ, calculated using the DORT two-dimensional multigroup neutron-transport compute code and the SCALE4 code with a system of multigroup nuclear constants. For a regular IBR-2M regime βeff = 0.00216 ± 0.00007, τ = (6.5 ± 0.5)·10–8 sec, the delay-neutron value γ = 0.980, the prompt-neutron decay constant in the critical state α = 3.5·104 sec–1. The calculations showed that the effective delayed-neutron fraction for IBR-2M is identical, within the error limits, to the measured value for IBR-2, the prompt-neutron lifetime is approximately 5% longer (βeff = 0.00216, τ = (6.2 ± 0.2)·10–8 sec). It is shown that βeff and τ increase somewhat as the IBR-2 core size increases in the radial direction. |
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