Abstract:The uranium-zirconium alloy fuel is the main fuel form in fourth-generation advanced nuclear energy system. The composition and content of alloy is one of key parameters influencing the fuel performance. Therefore, the timely and accurate determination of uranium(U) and zirconium(Zr) contents in uranium-zirconium alloy is very important. For the routine determination methods of uranium and zirconium with general contents, the analysis process is complicated or the interference of matrix effect is obvious. The experimental points were arranged by uniform design. The uniform design table with four factors and nine levels (U*9(94)) was used to meet the development requirements of uranium-zirconium alloy fuel with different uranium and zirconium contents. The analysis method of U and Zr in uranium-zirconium alloy fuel by X-ray fluorescence spectrometry was established. The multiple regression models between signal intensity (I) and elemental concentration (C) for U and Zr were obtained by experiments: CZr=-0.032+0.008 IZr+2.395×10-5IZr·IU and CU=-0.408+0.03 IU+1.003×10-5I2Zr. The content of Zr and U was linear to the corresponding fluorescence signal intensity, respectively. The relative deviation of results for standard solution could be controlled within 2.0% and 1.0% for Zr and U, respectively. The analysis results of U and Zr contents in six uranium-zirconium alloys were consistent with those obtained by binary ratio method.
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