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The large amounts of nuclear material processed typically in modern nuclear reprocessing plants place high requirements on the measurement of the fissile material at the input (dissolution of fuel ), output (product materials: uranium and plutonium oxide) and also at intermediate steps in the process, as well as in waste streams.
Although the measurement of fissile material for process control can be made on a relative basis, the comparison of results of amounts of fissile material - in particular U and Pu amounts and isotopic abundances- with the safeguards authorities means that the measurement results must be traceable. The role of the metrology laboratory is to provide the Reference Materials (isotopic, spike and element assay ) to give the analytical laboratories the foundation on which their results can be based. The external proof, however, is demonstrated by the results of external QC campaigns. These use Certified Test Samples, which allows the participating laboratory to have an absolute comparison for the results in these QC campaigns.

Additional information

Authors: WELLUM R, IRMM, JRC, Geel (BE)
Bibliographic Reference: Paper presented: Tripartite Seminar on Nuclear Material Accounting and Control at Radiochemical Plants, Obninsk (RU), November 2-6th, 1998
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, 1-21020 Ispra (IT)
Record Number: 199910233 / Last updated on: 1999-03-12
Original language: en
Available languages: en
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