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Confinement Vessel Assay System [electronic resource] : Design and Implementation Report

Published
Los Alamos, N.M. : Los Alamos National Laboratory, 2012.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Los Alamos National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Los Alamos National Laboratory has a number of spherical confinement vessels remaining from tests involving nuclear materials. These vessels have an inner diameter of 6 feet with 1- to 2-inch thick steel walls. The goal of the Confinement Vessel Disposition (CVD) project is to remove debris and reduce contamination inside the vessels. We have developed a neutron assay system for the purposes of Materials Control and Accountability (MC&A) measurements of the vessel prior to and after cleanout. We present our approach to confronting the challenges in designing, building, and testing such a system. The system was designed to meet a set of functional and operational requirements. A Monte Carlo model was developed to aid in optimizing the detector design as well as to predict the systematic uncertainty associated with confinement vessel measurements. Initial testing was performed to optimize and determine various measurement parameters, and then the system was characterized using ²⁵²Cf placed a various locations throughout the measurement system. Measurements were also performed with a ²⁵²Cf source placed inside of small steel and HDPE shells to study the effect of moderation. These measurements compare favorably with their MCNPX model equivalent, making us confident that we can rely on the Monte Carlo simulation to predict the systematic uncertainty due to variations in response to material that may be localized at different points within a vessel.
Report Numbers
E 1.99:la-ur-12-23132
la-ur-12-23132
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Note
Published through SciTech Connect.
07/18/2012.
"la-ur-12-23132"
Bourne, Mark M.; Stange, Sy; Mayo, Douglas R.; Frame, Katherine C.; Crooks, William J.; Evans, Louise; Miko, David K.; Salazar, William R.; Vigil, Georgiana M.; Gomez, Cipriano D.
Funding Information
AC52-06NA25396
View MARC record | catkey: 14398971