Methods of calculating the nuclear reactor reactivity from the measured time-dependence of the neutron flux are discussed. It is noted that the corresponding problems for the direct and inverse equations of point kinetics in the approximation of a prompt-jump change of neutron flux are not equivalent, which is expressed in that the reactivity values in these problems do not coincide with one another. The reasons for the nonequivalence and ways of its elimination are investigated. New equations of inverse point kinetics without this deficiency are proposed. It is shown that the proposed equations give the correct reactivity immediately after the onset of a perturbation in the reactor and not asymptotically as in the case of the conventional equations.
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Translated from Atomnaya Énergiya, Vol. 128, No. 3, pp. 169–172, March, 2020
B. D. Abramov is deceased
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Abramov, B.D. Reactivity Measurement in the Prompt-Jump Approximation for the Neutron Flux. At Energy 128, 182–187 (2020). https://doi.org/10.1007/s10512-020-00672-w
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DOI: https://doi.org/10.1007/s10512-020-00672-w