Publication Date: 2/1/73     Pages: 1     Date Entered: 2/22/84     Title: STATISTICAL TERMINOLOGY AND NOTATION FOR SPECIAL NUCLEAR MATERIALS CONTROL AND ACCOUNTABILITY     2/2/73     U.S. ATOMIC ENERGY COMMISSION     REGULATORY GUIDE     DIRECTORATE OF REGULATORY STANDARDS     REGULATORY GUIDE 5.3     STATISTICAL TERMINOLOGY AND NOTATION FOR SPECIAL     NUCLEAR MATERIALS CONTROL AND ACCOUNTABILITY A. INTRODUCTION     Part 70 of Title 10 of the Code of Federal Regulations requires     certain AEC special nuclear material licensees to establish and maintain     sufficient written material control and accounting procedures to enable     the licensee to account for the special nuclear material in his     possession. Part 70 also requires applicants for certain AEC licenses     for special nuclear material to submit to the Commission as part of the     application a full description of such procedures, including recording,     reporting, physical inventory, and measurement procedures for special     nuclear material. Essential to satisfactory material control and     accounting procedures are measurement and statistical controls. This     guide identifies acceptable terminology and notation concerning     statistical analyses of accountability data for special nuclear material     control purposes. B. DISCUSSION     Statistical techniques have been developed for and applied to     special nuclear materials control and accountability systems to enable     licensees of fuel processing and fuel fabrication facilities to account     for the special nuclear material they possess and to localize losses     when they occur. Because of the diverse yet overlapping applications of     statistical controls, it is desirable that a uniform terminology be used     to improve comprehension and communication and to assure effective     implementation of special nuclear materials control and accountability     programs. The standardization of statistical terminology is desirable     in describing material protection systems for controlling special     nuclear material. Among these systems are process control, sampling,     error propagation, quality assurance, measurement, estimation, data     recording, reporting, and inventory control as well as verification,     auditing, and inspection of special nuclear materials. All entail     varying degrees of statistical evaluation and each interacts with the     others. In recognition of the need for standarizing statistical     terminology, the American National Standards Institute (ANSI)     Subcommittee N15-3, Statistics, has developed a standard for statistical     terminology and notation for nuclear materials management. C. REGULATORY POSITION     The terminology and notation contained in ANSI N15.5-1972     "Statistical Terminology and Notation for Nuclear Materials     Management"(1) approved May 24, 1972, are generally acceptable for use     in written special nuclear material control procedures. Further     clarification of one term is provided as follows: the AEC Regulatory     staff has construed "Limit of Error" as the uncertainty component used     to construct a 95% confidence interval associated with a quantity when     the effect of any recognized bias has been accounted for or otherwise     eliminated by the user. The uncertainty component should include     systematic as well as random errors.     ----------     (1) Copies may be obtained from the American National Standards     Institute, Inc., 1430 Broadway, New York, New York 10018.     ----------     41