RAPID FUEL DRAWER SCANNER FOR FAST CRITICAL ASSEMBLY SAFEGUARDS

Year
1980
Author(s)
Hastings Smith - Los Alamos National Laboratory),
J.C. Pratt - Los Alamos National Laboratory
J.T. Caldwell - Los Alamos National Laboratory
S.W. France - Los Alamos National Laboratory
Abstract
An integrated scanning system incorporating highly efficient collimated neutron and high purity germanium gamma detectors with an on-line microprocessor has been developed to perform rapid inventorying of uranium and Plutonium fuel drawers from fast critical assemblies. On-line least-squares fit procedures provide quantitative comparisons at a rate exceeding two drawers per minute. For plutonium-containing fuel, the neutron scan data can be related to the included 240pu -fsotopic mass; individual 239pu> 241pu> ancj 241/\\m fsotopic contents are obtained from simultaneous scans of the appropriate isolated gamma lines.