核燃料技术——溶液、六氟化铀和solidsPart 1中铀的测定:铁（II）还原/重铬酸钾氧化滴定法

[中文适用范围]： 本文件描述了一种分析方法，用于测定纯产品材料（如铀金属、二氧化铀、三氧化铀、硝酸铀酰六水合物、六氟化铀和八氧化三铀）中的铀含量。该程序足够准确和精确，可用于核材料责任。该方法可直接用于分析大多数铀和铀氧化物核反应堆燃料（无论是辐照还是未辐照）以及铀硝酸盐产品溶液。相当于重原子燃烧率高达10%的裂变产物不会干扰，其他可能引起干扰的元素通常不足以显著影响结果。该方法建议称取样品等分试样并使用质量滴定，以获得更好的精密度和准确性。这并不排除使用可能提供等效性能的替代技术。在方法的一些关键步骤中使用自动化设备具有一些优势，特别是在常规分析的情况下。 [外文原描述]： This document describes an analytical method for the determination of uranium in samples from pure product materials such as U metal, UO 2 , UO 3 , uranyl nitrate hexahydrate, uranium hexafluoride and U 3 O 8 from the nuclear fuel cycle. This procedure is sufficiently accurate and precise to be used for nuclear materials accountability. This method can be used directly for the analysis of most uranium and uranium oxide nuclear reactor fuels, either irradiated or un-irradiated, and of uranium nitrate product solutions. Fission products equivalent to up to 10 % burn-up of heavy atoms do not interfere, and other elements which could cause interference are not normally present in sufficient quantity to affect the result significantly. The method recommends that an aliquot of sample is weighed and that a mass titration is used, in order to obtain improved precision and accuracy. This does not preclude the use of alternative techniques which could give equivalent performance. The use of automatic device(s) in the performance of some critical steps of the method has some advantages, mainly in the case of routine analysis.