Abstract
The fuel temperature is one of the important parameters which are analyzed during an accident. It is often calculated in a one-dimensional model of a fuel element. The present work studies the three-dimensional effects arising because of the nonuniformity of the RBMK lattice and the position of the fuel assemblies in a channel, giving rise to azimuthal asymmetry of power release which is exacerbated by nonuniform plutonium accumulation along the radius and azimuth of a fuel assembly. The axial nonuniformity engendered by the presence of a water gap between the top and bottom bundle of fuel elements is consequential.
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