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UF_6 SAMPLING METHOD USING ALUMINA

机译：UF_6使用氧化铝的采样方法

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The ABACC-Brazilian-Argentine Agency for Accounting and Control of Nuclear Materials performs safeguard inspections jointly with the IAEA-International Atomic Energy Agency at enrichment plants in Brazil and Argentina. Particularly, at enrichment plants in Brazil that use centrifuge enrichment process, routine and unannounced inspections are performed and UF_6 samples are taken from process lines and cylinders to verify the uranium enrichment conformity with design/operator declarations. ABACC has developed a UF_6 sampling method for enrichment determination (named ABACC-Cristallini Method) which uses a fluorothene P-10 tube type containing alumina pellets that absorb and hydrolyze UF_6 directly during the sampling. The alumina pellets retain up to few hundreds milligrams of U (in a solid compound – UO_2F_2) without the need of using liquid nitrogen during sampling. This new method has advantages compared to the currently used method that uses a Hoke tube as: the UF_6 sample content left at the installation (archive sample) will be lower and less reactive, the laboratory procedures for manipulating the sample will be much easier, the residual uranium retained at the laboratory will be much lower, the sampling device is less expensive, there will be saves in transport cost as well, and it is relatively safer concerning radiological protection aspects during transportation. This paper describes the physical principle of the new method, the experiments carried out at laboratory taking into account different process parameters foreseen in real cases, and the development of a procedure for recovering the uranium retained inside the alumina pellets for the U enrichment measurement. The behavior of the new method is compared to the traditional one, showing no loss of accuracy for the enrichment determination with real UF_6 samples taken from enrichment plants. The qualification strategy applied to the new method for routine safeguard application at the enrichment plants is presented in this paper as well.
机译：ABACC-巴西-阿根廷核材料核算和控制局与IAEA-国际原子能机构在巴西和阿根廷的浓缩厂联合进行了安全检查。特别是，在巴西使用离心浓缩工艺的浓缩厂中，进行了常规检查和突击检查，并从生产线和钢瓶中提取了UF_6样品，以验证铀浓缩是否符合设计/操作人员声明。 ABACC开发了用于富集测定的UF_6采样方法（称为ABACC-Cristallini方法），该方法使用的是荧光粉P-10管型氧化铝颗粒，在采样过程中会直接吸收和水解UF_6。氧化铝颗粒可保留多达数百毫克的U（以固体化合物UO_2F_2的形式），而在采样过程中无需使用液氮。与目前使用的使用Hoke管的方法相比，该新方法具有以下优点：在设备上保留的UF_6样品含量（存档样品）将更低且反应性更小，操作样品的实验室程序将更加容易，保留在实验室的铀残留量将大大降低，采样设备的价格将降低，运输成本也将得到节省，并且在运输过程中在放射防护方面相对较为安全。本文介绍了该新方法的物理原理，在实验室中进行的实验，其中考虑了实际情况中预期的不同工艺参数，并开发了一种回收保留在氧化铝颗粒中的铀以进行U富集测量的程序。将该新方法的行为与传统方法进行了比较，结果表明，从富集工厂中提取的真实UF_6样品进行富集测定时，准确性没有损失。本文还提出了应用于浓缩工厂常规保障新方法的资格认证策略。

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