# Noble Gas Meas, Analysis Tech for Monitoring Reprocessing

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Calculations were performed for this assembly at the assembly-level, pin cell level, and modified pin cell level using a pin cell with the same FM ratio as the assembly. Comparisons were made between each of the calculational levels for the following spent fuel isotopic ratios: ‘5U/n8U, 2~~z9pu, 131Xe/134Xe,132Xe/134Xe, -. -. ’ . +. . -. @ and ‘Kr/8’%Cr. The values of the individual isotopic ratios calculated were compared using the maximum percent deviation (MPD) of each result from a value calculated using some nominal parameter (either analytically determined, fine mesh limit, or arbitrarily chosen).

Method was the Determining spent fiel parameters from noble gas emissions requires highly precise and accurate measurements of the isotopic ratios of the stable fission gases. Compared to the background air, the concentration of the fission gases on-stack at a reprocessing facility may be low. This necessitates the use of a highprecision instrument that will allow for the extraction of the fissiogenic component with a high-degree of accuracy. Since the isotopes of interest in this study are primarily stable noble gases, mass spectrometry is the ideal choice for a measurement system.

01 -1 0 2 4 6 8 10 12 14 Number of Radial Fuel Regions Fig. 14. Maximum percent deviation in the 131Xe/134Xe isotopic ratio from the fine mesh limit result as a function of the number of radial fuel regions used for three different distributions of the radii. — -__— 47 TABLE II Maximum Percent Deviation of Various Isotopic Ratios from the Fine Mesh Value (Chosen at 21 Radial Fuel Regions) for Different Numbers of Flat-Flux Radial Fuel Regions I Maximum Percent Deviation from Fine Mesh Limit (%) I #of Fuel Re “ens 1 K 2 235U.