RG 5.9-73 相关标准章节.docxVIP

Publication Date: 6/1/73  Pages: 7  Date Entered: 1/5/93  Title: Guidelines for Germanium Spectroscopy Systems for Measurement for Special Nuclear Material  June 1973  U.S. NUCLEAR REGULATORY COMMISSION  REGULATORY GUIDE  OFFICE OF NUCLEAR REGULATORY RESEARCH  REGULATORY GUIDE 5.9  (Task SG 042-2) GUIDELINES FOR GERMANIUM SPECTROSCOPY SYSTEMS  FOR MEASUREMENT OF SPECIAL NUCLEAR MATERIAL A. INTRODUCTION  Section 70.51, Material Balance, Inventory, and Records  Requirements, of 10 CFR Part 70, Domestic Licensing of Special Nuclear  Material, requires, in part, that licensees authorized to possess at  any one time more than one effective kilogram of special nuclear  material establish and maintain a system of control and accountability  so that the standard error (estimator) of any inventory difference,  ascertained as a result of a measured material balance, meets  established minimum standards. The selection and proper application of  an adequate measurement method for each of the material forms in the  fuel cycle is essential for the maintenance of these standards.  Many types of nondestructive assay (NDA) measurements on special  nuclear material (SNM) can involve, or even require, a high-resolution  gamma ray spectroscopy system. This guide is intended both to provide  some general guidelines acceptable to the NRC staff for the selection of  such systems and to point out useful resources for more detailed  information on their assembly, optimization, and use in material  protection measurements.  Any guidance in this document related to information collection  activities has been cleared under OMB Clearance No. 3150-0009. B. DISCUSSION 1. BACKGROUND  Gamma ray spectroscopy systems are used for NDA of various special  nuclear material forms encountered in the nuclear fuel cycle, both for  quantitative determination of the SNM content an