Isotopic Correlation Technique Methods of Calculation and Experimental Checking by WWER-70 Fuel

摘要

Procedures have been elaborated to investigate isotopic correlations by calculating concentrations of fissionable nuclides and fission products as well as the burnup for an irradiation history consisting in time intervals with constant neutron flux densities. Effective cross sections suitable for a one group formalism are derived. Results of such calculations are checked by mass spectrometric and gamma -spectrometric measurements performed on fuel assemblies and elements irradiated in the PWR of the Rheinsberg power station (WWER-70). As a result of this comparison, simple approximation functions are derived concerning the correlation between the burnup and ratios of fission product concentrations. These functions are suited to determine the burnup of irradiated fuel assemblies by means of relative gamma -spectrometric measurements with an accuracy sufficient for safeguards. (Atomindex citation 10:459336)