RECENT INVESTIGATIONS CONCERNING THE INFLUENCE OF NON4LMIFORI TEMPERATURE DISTRIBUTION IN DOPPLER EFFECT CALCULATIONS

摘要

To study the influence of nonuniformities in the temperature distribution inside the fuel rods the Doppler coefficient has been calculated by direct integration of the narrow resonance formulas for a single resonance for a slab lattice Also, a Monte Carlo method has been developed which allows the calculation of the total temperature coefficient of non uniformly heated fuel in the region of unresolved resonances, in this method the details of the resonance structure are determined by sampling from the statistical level and widths distributions Preliminary results of both theories will be presented.