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Report No.
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JASPAS JC-11(A556); Non-destructive Assay for Uranium and Plutonium in Reprocessing Input Solutions -Hybrid K-edge/XRF Densitometer- (JASPAS JC-11 Final)

Surugaya, Naoki ; Abe, Katsuo; Kurosawa, A.; Ikeda, Hisashi ; Kuno, Yusuke

As a part of JASPAS programme, a non-radioactive assay system for the accountability of uranium and plutonium in input dissolver solutions of a spent fuel reprocessing plant, called Hybrid K-edge/XRF Densitometer, has been developed at the Tokai Reprocessing plant (TRP) since 1991. The instrument is the one of the hybrid type combined K-edge densitometry (KED) and X-ray fluorescence (XRF) analysis. The KED is used to determine the uranium concentration and the XRF is used to determine the U/Pu ratio. These results give the plutonium concentration in consequence. It is considered that the instrument has the capability of timely on-site verification for input accountancy. The instrument had been installed in the analytical hot cell at the TRP and the experiments comparing with Isotope Dilution Mass Spectrometry (IDMS) method have been carried out. As the results of measurements for the actual input solutions in the acceptance and performance tests, it was typically confirmed that the precision for determining uranium concentration by the KED was within 0.2%, whereas the XRF for Plutonium performed within 0.7%. This final report summarizes the design information and performance data so as to end the JASPAS programme.

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