We offer to your attention a preprint “Dynamics of the IBR-2M Reactor at a power pulse repetition frequency of 10 Hz” P13-2022-52 issued by the JINR Publishing Department. The authors are Yuri Pepelyshev and Davaasuren Sumkhuu.

The results of the analysis of a mathematical modeling for the IBR-2M Pulsed Reactor dynamics for a transition from a power pulse repetition frequency of 5 to 10 Hz are presented. The change in the amplitude response of the reactor for variable pulse delayed neutron fraction was studied. The authors used a set of power feedback parameters determined experimentally in 2021 at an energy output of 1820 MW· day. At a pulse repetition frequency of 10 Hz, the amplitude of pulse energy oscillations significantly depends on the value of the delayed neutron fraction in pulse β_p. Depending on β_p both suppression and amplification of reactor power fluctuations in the frequency ranges of 0.05–0.20 and 1.25–5.00 Hz can be realised.

The study has been carried out at the Frank Laboratory of Neutron Physics JINR. Submitted to the journal “Nuclear Engineering and Technology”.

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