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The adsorption properties of U(VI) with a new type of fibrous and polymeric adsorbent containing amidoxime chelating functional group (FPAO) from seawater was studied by the method of the static state adsorption at 25 8C. The optimum conditions of the adsorption were determined by investigating the influence of the concentrations of FPAO, U(VI), feed acidity, temperature, and the shape and size of FPAO on the adsorption equilibrium.

The computer code PARC was developed in Japan Atomic Energy Agency, in order to predict the behavior of uranium, plutonium, neptunium, and severalˆssion products in a reprocessing plant for spent nuclear fuel. This code has several useful calculation functions, i.e., PARC can deal with both mixer settlers and pulsed columns simultaneously, and new equations for chemical reaction, reaction constant, and distribution ratio can be easily inputted to PARC without the recompilation of the program. Therefore, it is expected to be widely used for basic solvent extraction study, separation process design, plant management, and safety analysis for future reprocessing. In the present paper, the outlines of an extractor model and several chemical reaction models used in PARC are introduced, and results of calculations for uranium and plutonium behaviors in the U/Pu separation process in PUREX are shown, which enable the elucidation of the eŠect of the increase in Pu concentration in the feed solution and the importance of the selection of Pu oxidation/ reduction reaction models.

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