Results of numerical calculations of heat exchange in a nuclear heating detector for nuclear reactors
are presented in this paper. The gamma radiation is generated in nuclear reactor during fission and radiative
capture reactions as well as radioactive decay of its products. A single-cell calorimeter has been designed for
application in the MARIA research reactor in the National Centre for Nuclear Research (NCBJ) in Świerk near
Warsaw, Poland, and can also be used in the Jules Horowitz Reactor (JHR), which is under construction in the
research centre in Cadarache, France. It consists of a cylindrical sample, which is surrounded by a gas layer,
contained in a cylindrical housing. Additional calculations had to be performed before its insertion into the
reactor. Within this analysis, modern computational fuid dynamics (CFD) methods have been used for assessing
important parameters, for example, mean surface temperature, mean volume temperature, and maximum
sample (calorimeter core) temperature. Results of an experiment performed at a dedicated out-of-pile calibration
bench and results of numerical modelling validation are also included in this paper.
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