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About the usage of alpha-autoradiography and EPMA in routine, it is considered that EPMA is applied to the sample, Pu spot of which is measured relatively large by alpha-autoradiography. 2. Determination of plutonium and uranium concentration Concerning the basic property of MOX, determination of plutonium concentration is most important for process control and material accountancy. In Plutonium Fuel Center, it is necessary to analyze the many kinds of sample with various plutonium concentrations.

Quality control and assurance system of MOX fabrication was established in 1975 when fuel fabrication for FUGEN was started. Quality control is considered to be important from the following 2 points. One is for maintaining the safety of the plant; another is for achievement of performance of the product. In this paper, the outline and present status of quality control and assurance related to the performance of product, MOX fuel, are described. The basic concept and associated procedures of quality control and assurance related to MOX fuel fabrication in JNC are described highlighting measurements of plutonium enriched zone, determination of plutonium concentration in MOX fuels and the advanced method of visual inspection for the surface appearance of the products.

The specification of chemical and physical property of pellets is confirmed with analysis and measurement at each step. Analysis is carried out for not only quality control and assurance but also process control. Analysis is carried out mainly for confirmation that the performance of the product meets the specification and almost samples are taken from the pellets. c^nwtri^C,F,C3,H2O) | Cross Blending { Pliyslc*! _ Homogenizing | A Binder AdAtion 1 ^ Granuation | Calcinaa Reductio„ | A Crashing > v Pelteizing O/M ratio —— MetalitBpBriO' cone.

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