[en] The isotopic correlation techniques (ICT) are emerging as an important supporting measure for the accounting and control of nuclear materials which pass through commercial fuel cycle for the production of nuclear energy. The present paper gives an overview on the development of the ICT and discusses their possible uses in various parts of a commercial fuel cycle. It is shown that ICT can be used advantageously both for the purposes of plant operation and safeguards. The paper ends with the conclusion that ICT may be particularly useful for the fuel cycle of the 1980's and that they can be utilized to the fullest advantage for safeguards when fuel cycle is considered as a whole. (orig.)

[en] After establishing the process and accountancy data-base for a 1000 t HM/a reference reprocessing facility, the workshop developed simulation models for the sequential generation of data for throughput and inventory of plutonium in the process material balance area (MBA). A well defined set of boundary conditions and parameter values for measurement uncertainties and loss patterns was established, on the basis of which a number of sequential statistical test procedures was evaluated. One important condition for the application of the NRTA measure was the stipulation that routinely measured Pu inventories in process tanks only, would be used, since more than 95% of Pu inventories in the process MBA are in these tanks. About 12 kg of Pu, expected to be the normal inventory in six pulse columns, was assumed to be constant. In spite of the simplifications made and the fact that mainly simulated data were used, these investigations permit the conclusion that the NRTA measure provides a greater sensitivity in terms of the amounts which can be detected and the timeliness of detection, than the conventional material accountancy. Since measurements are restricted to process tanks only, routinely available measurement techniques can be used. (orig.)

[en] The present volume specifically reviews the present state of the art of steroid radioimmunoassay per se. Despite the many technical problems encountered in the application of these techniques, and in the elimination of the particular sources of error to which they are prone, such methods have totally transformed the field of steroid measurement. (orig./AJ)

No abstract available

No abstract available

No abstract available

[en] The capability and limitations of the NRTA method (Near-Real-Time Accountancy method) in reprocessing facilities with different throughputs and inventories and measurement uncertainties, were investigated with a detailed computer simulated data base. These investigations have confirmed the earlier findings that the NRTA method could permit under certain operating conditions and for a number of realistic diversion scenarios, a perceptible improvement in the detection capability. Depending on the conditions prevailing, such improvements could be by a factor of 10-20, both for the detectable amounts and the detection time, over the conventional material balance method with annual inventories. The reasons for and the conditions which would permit such improvements have been discussed in detail with numerical examples in the report. (orig.)

[en] The staff of the US Nuclear Regulatory Commission has prepared this staff technical position for the purpose of compiling and further clarifying previous staff positions on regulatory considerations in the design and construction of the exploratory shaft facility (ESF). (The US Department of Energy (DOE) now refers to the ESF as the ''exploratory studies facility.'' DOE's change in terminology does not affect the positions taken in this guidance.) This document lists the key regulations in 10 CFR Part 60 that should be considered in the design and construction of the ESF and presents the staff position statements and corresponding discussions. 13 refs., 1 fig

[en] Review is made to trace the development path of the isotopic correlation technique and indicate the possible areas of its application in the accounting and control of nuclear materials, i.e. in uranium enrichment, reactors, and fuel reprocessing. Large-scale activities both international and national are required to bring the ICT to the level at which nuclear facility operators and safeguard organizations may use it as a reliable means routinely. Then, the ICT will be used for whole nuclear fuel cycle, not fragmentarily in individual facilities. (Mori, K.)

No abstract available