RG 5.26-74 相关标准章节.docxVIP

Publication Date: 6/1/74  Pages: 6  Date Entered: 1/5/93  Title: Selection of Material Balance Areas and Item Control Areas  June 1974  U.S. ATOMIC ENERGY COMMISSION  REGULATORY GUIDE  DIRECTORATE OF REGULATORY STANDARDS  REGULATORY GUIDE 5.26  SELECTION OF  MATERIAL BALANCE AREAS AND ITEM CONTROL AREAS A. INTRODUCTION  Proposed (38 FR 26735) Section 70.58, Fundamental Nuclear Materal  Controls, of 10 CFR Part 70, Special Nuclear Material. would require  certain licensees authorized to possess more than one effective kilogram  of special nuclear material to establish Material Balance Areas (MBAs)  or Item Control Areas (ICAs) for the physical and administrative control  of nuclear materials. This section would require that: 1. Each MBA be an identifiable physical area such that the quantity  of nuclear material being moved into or out of the MBA can be measured. 2. A sufficient number of MBAs be established so that nuclear  material losses, thefts, or diversions can be localized and the  mechanisms identified. 3. The custody of all nuclear material within an MBA be the  responsibility of a single individual. 4. ICAs be established according to the same criteria as MBAs except  that control into and out of such areas would be by item identity and  count for previously determined special nuclear material quantities.  This guide describes bases acceptable to the Regulatory staff for  the selection of material balance areas and item control areas. B. DISCUSSION  The division of a nuclear plant into material balance areas and  item control areas can provide improved material control and accounting  as follows: 1. A loss or theft of material or of an item or items can be  identified as having occurred in a particular part of the plant so that  the investigation can be more effective and the loss or theft mechanism  more easily identified and cor