Calibration and Qualification of the Isotopic Source Adjustable Fissometer (ISAF) for Assay of Low-Enriched Discrepant Uranium Materials

A description of the installation, intended usage, calibration, and planned qualification of an Isotopic Source Adjustable Fissometer (ISAF) for nondestructive assay of bulk quantities of low-enriched discrepant uranium materials at the General Electric Company's Nuclear Fuel Division is presented. The instrument design stresses ease of operation and maintenance. Operator skill requirements are kept at a minimum by automatic, on-line data processing capability. The calibration results show good accuracy for certain discrepant low-enriched materials. The instrument is expected to be qualified as part of a material accountability balance, thereby reducing participation of laboratory analysis.