NONDESTRUCTIVE ASSAY (NDA) OF FISSILE MATERIAL IN GLOVEBOXES AND EQUIPMENT AT ROCKY FLATS ENVIRONMENTAL TECHNOLOGY SITE

Year
1997
Author(s)
Frank Lamb - Unwin Company
David J. Dreher - Safeguards Measurements,
Abstract
At Rocky Flats Environmental Technology Site (RFETS), a glovebox and equipment holdup measurement program called “Untoward Areas” was performed in FY92. These measurements were completed in selected areas of one building. After completing this task, measurements in two other buildings had been completed to assist in characterizing their entire inventory. This information was used as part of evaluating safeguards and security requirements. However, a large percent of the gloveboxes and equipment in process buildings have not been measured. Before FY97, holdup measurements were being performed prior to decommissioning and deactivation activities. To accelerate the quantification of holdup a list of areas suspected to have high amounts of holdup was compiled and funding was requested and recently received. Glovebox and equipment locations were selected by use of several selection criteria. The following steps were taken in the selection process: (1) attribute scan results (FY95) were examined and high scan result locations were selected, (2) knowledgeable personnel within and outside our organization were consulted, and (3) video characterization of the Building 707 chainveyor system was examined. Only a few of the high scan result areas from the attribute scan list had not been identified by the use of process knowledge. The primary driver for holdup measurements is Department of Energy (DOE) Order 5633.3B, Section II-3, Physical Inventories. Introduction Before the high holdup measurements can be made, a variety