[en] The measurement data of 28 interlaboratory analysis performed under the IDA-80 programme are evaluated by the DoD (Distribution of Differences) method with respect to the RSDs of the interlaboratory spreads and the within-laboratory uncertainty components. The resulting estimates are compared to those obtained by variance analysis after application of outlier criteria in the official IDA-80 evaluation. Deviations found in case of the within-laboratory uncertainty components ('run' component of the IDA-80 evaluation) are discussed. (orig./HP)

No abstract available

[en] The evaluation data derived from the measurement results of the laboratories participating in the IDA-80 programme have been compiled in tables and graphs. They concern a total of more than 2000 determinations of isotope ratios, isotope abundances and concentrations for uranium and plutonium obtained on test materials of industrial origin which contained fission products, and on fission product free synthetic reference solutions. Comparisons are made with data certified by CBNM and NBS, and estimates are given which were calculated by variance analyses for within- and between laboratory variations. (orig.)

[en] This report includes a comprehensive manual of the computer program PROSA which illustrate the handling and functioning of PROSA. The manual PROSA 4.0 (FORTRAN 77) describes the PC Version of PROSA including its program moduls. The PROSA program package is a statistical tool to decide on the basis of statistical assumptions whether in a given sequence of material balance periods a loss of material might have occurred. The evaluation of the material balance data is based on statistical test procedures. In the present PROSA Version 4.0 the three tests CUMUF test, PAGE's test and GEMUF test are applied to a sequence of material balances. PROSA Version 4.0 supports a real sequential evaluation. That means, PROSA is not only able to evaluate a series of MUF values sequentially after the campaign has finished, but also real sequentially during the campaign. PROSA Version 4.0 is a menu-guided computer program. Data input can be performed either by diskette or by key-enter. Result output is primarily an information whether or not an alarm is indicated. This information can be displayed either numerically or graphically. Therefore, a comfortable graphical output utility is attached to PROSA 4.0. The program moduls are compiled and linked with the Ryan Mc-Farland Compiler. The PROSA graphical utility uses the PLOT88 Library of Plotworks, Inc. (orig./HP)

[en] The DoD method for robust estimating of variances of measurement series (time series) without the exclusion of outliers is described in detail, including its mathematical-statistical basis. In particular, it is proved that the total of all n(n-1)/2 absolute differences obtainable from n measurement values (realizations of random variables) may be subdivided into groups, each of them consisting of stochastically independent differences only. This is necessary for theoretical foundation of the DoDM estimator. Numerical examples of possible applications are given. Thereby, the evaluation of IDA-80 data presented earlier is completed applying the DoDM estimator. (orig.)

[en] An empirical method of data evaluation is described which allows the derivation of meaningful estimates of the variances of data groups even if they comprise extreme values (outliers). It can be applied to problems usually treated by variance analysis and seems to be suitable to investigate and describe the state of the art of the various analytical methods applied in international safeguards. Some examples are given to illustrate this procedure; they are based on data of the SALE program

[en] The material accountancy system of a LWR fuel fabrication plant is analyzed. The input, product and waste streams, and the physical inventory of the plant are determined; the measurement methods together with their errors are described. On the basis of these data the accuracy of material balance establishment is determined. In the second part of this paper one possible data verification system in the sense of the IAEA international safeguards system is analyzed: the material classes to be safeguarded are determined, and an inspection effort optimization as well as an efficiency study are performed. In the last part of the efficiency of the total safeguards system is determined: material accountancy and data verification. By this analysis reasonable requirements can be formulated for a safeguards system under present circumstances. (orig./HP)

[en] Theoretical considerations and practical applications of the DoD method of measurement data evaluation are presented. The method proves to be a reasonable way of estimating meaningful standard deviations without the necessity of rejecting outliers. It therefore always leads to the same values, regardless of the statistician who performed the evaluation. Graphical display of the method is helpful for judging measurement discrepancies and can be used as a basis for data verification purposes. (author)

No abstract available

[en] Material accountancy is an important tool for international nuclear safeguards. The aim is to detect a possible loss of material timely and with high probability. In this context, a computer program called PROSA (Program for Sequential Analysis of NRTA data) was developed at the Karlsruhe Nuclear Research Center. PROSA is a statistical tool to decide on the basis of statistical considerations whether or not in a given sequence of material balances a loss of material might have occurred. The evaluation of the material balance data (MUF values) is carried out with statistical test procedures. In the present PROSA version 4.0 three tests, Page's test, CUMUF test and GEMUF test are applied at a time. These three test procedures are the result of several years of research and are supposed to be the most promising ones with respect to the detection probability of possible losses of material as well as to the timeliness of such a detection. PROSA version 4.0 is a user-friendly, menudriven computer program which is suitable for routine field application. Data input - that means MUF values and measurement model - can be performed either by diskette or by key-enter. The output consists of an information whether or not an alarm is indicated. This information can be displayed either numerically or graphically. Therefore, a comfortable graphical output utility is attached to PROSA version 4.0. In this presentation the theoretical concepts implemented in PROSA will be explained. Furthermore, the functioning of the program will be presented and the performance of PROSA will be demonstrated using balance data of a real reprocessing campaign. (J.P.N.)