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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Translated from Atomnaya Énergiya,Vol. 111, No. 2, pp. 93–96, August, 2011.
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Pepelyshev, Y.N., Rogov, A.D., Taiybov, L.A. et al. Calculation of the effective delayed-neutron fraction and prompt-neutron lifetime in IBR-2M. At Energy 111, 122–126 (2011). https://doi.org/10.1007/s10512-011-9463-8
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DOI: https://doi.org/10.1007/s10512-011-9463-8