Conclusions
The proposed computational approaches for determining the thermal conditions of the fuel elements with allowance for their operating history have made it possible to bring closer together the calculated and experimental values of the power effect of reactivity and its dependence on the power level in the BN-350.
Analysis of the causes of the divergence of the experimental and calculated values of the power effect of reactivity showed that these divergences, as well as changes in the effect during operation, are due mainly to the thermal conditions of the fuel elements. The principal indeterminacy in the calculation of the thermal conditions of the fuel elements is due to the contact thermal conductivity and its variation with the operating conditions of the fuel elements in the reactor. In order to eliminate this indeterminacy it is necessary to carry out experimental investigations to ascertain the contact thermal conductivity as well as to refine the physicomechanical properties of the fuel (thermal conductivity, ultimate strength etc.) as a function of the burn-up and temperature.
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Translated from Atomnaya Énergiya, Vol. 47, No. 3, pp. 157–161, September, 1979.
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Pshakin, G.M., Proshkin, A.A. Power effect of reactivity in fast power reactor with allowance for behavior of fuel under irradiation. At Energy 47, 703–707 (1979). https://doi.org/10.1007/BF01120091
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DOI: https://doi.org/10.1007/BF01120091