摘要
铀锆合金燃料是第4代先进核能系统主要燃料形式,合金成分及含量是燃料性能的关键参数之一,及时、准确地测定铀锆合金中铀(U)、锆(Zr)含量至关重要。常规测量常量水平的铀、锆含量的方法,存在分析过程繁琐或受铀锆元素间基体效应干扰明显等问题。实验通过均匀设计试验方案设置试验点的布置方式,采用均匀设计方案,利用4因素9水平的均匀设计表(U_9~*(9~4))设置试验点,以满足不同铀、锆元素含量的铀锆合金燃料研制需求,建立了X射线荧光光谱(XRF)测定铀锆合金中铀和锆含量的方法。通过实验建立铀、锆信号强度(I)与元素浓度(C)的多元回归模型分别为C_(Zr)=-0.032+0.008 I_(Zr)+2.395×10^(-5)I_(Zr)·I_U,C_U=-0.408+0.03 I_U+1.003×10^(-5)I_(Zr)~2,锆、铀含量分别与锆、铀信号基本呈线性关系。对标准溶液中锆含量分析结果的相对偏差可控制在2.0%内,铀含量分析结果的相对偏差可控制在1.0%内;利用实验方法计算获得的6组铀锆合金中铀锆含量与二元比例方法较为吻合。
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~*(9~4))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:C_(Zr)=-0.032+0.008 I_(Zr)+2.395×10^(-5)I_(Zr)·I_U,C_U=-0.408+0.03 I_U+1.003×10^(-5)I_(Zr)~2.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.
出处
《冶金分析》
CAS
CSCD
北大核心
2017年第7期11-16,共6页
Metallurgical Analysis
关键词
铀锆合金
元素含量
均匀设计
多元回归分析
铀
锆
uranium-zirconium alloy
element content
uniform design
multiple regression analysis
uranium
zirconium
