Abstract
A series of investigations studying the currents of rhodium sensors in in-reactor monitoring systems and the relation between the currents and the energy release in the fuel elements in the nearest neighbor environment in a VVER-1000 fuel assembly model was completed in 2001–2002 at the Russsian Science Center Kurchatov Institute. The experiments were performed on the SK-fiz critical test stand; the calculations were performed using the high precision MCU-REA/2 computer program, implementing the Monte Carlo method. The reference experimental-computational method for determining the relation between the DCD current and the number of fissions in the six neighboring fuel elements and fuel assembly is described, the effects due to the arrangement of the DCDs at the center and in the fourth row of the fuel assembly are studied, and the experimental data are compared with the computational results.
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