Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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On the cyclic change in the dynamics of the IBR-2M pulsed reactor

  • Yu.N. Pepelyshev (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research) ;
  • Sumkhuu Davaasuren (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research)
  • Received : 2022.08.08
  • Accepted : 2023.01.03
  • Published : 2023.05.25
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Abstract

It is shown that in the IBR-2M reactor by the end of the reactor cycle, changes in dynamics are observed associated with a strong weakening of the fast power feedback (PF), as a result of which the reactor becomes oscillatorily unstable. After each week of zero-power operation the negative changes in reactor dynamics disappear and the stability of the reactor is restored. Thus, the reactor undergoes cyclic changes in the oscillatory instability. The correlation between of a fast PF and a slow PF is experimentally observed, which makes it possible to almost completely eliminate the cyclic component of instability by changing the control mode of rods of the control system.

Keywords

Acknowledgement

The authors express their gratitude to the staff of the IBR-2M facility for their help in conducting the experiments. We thank the "04-4-1105-2011/2022" for support.

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