ISO 12795-2004 核燃料技术.二氧化铀粉末和小球.带杂质修正的重量分析法测定铀和氧/铀比率

标准号：ISO 12795-2004
中文标准名称：核燃料技术.二氧化铀粉末和小球.带杂质修正的重量分析法测定铀和氧/铀比率
英文标准名称：Nuclear fuel technology - Uranium dioxide powder and pellets - Determination of uranium and oxygen/uranium ratio by gravimetric method with impurity correction
标准类型：F46
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：F46
国际标准分类号：27.120.30
适用范围：This International Standard specifies a method of determining the mass fraction of uranium and the oxygen-to-uranium atomic ratio in hyperstoichiometric uranium dioxide (UO2+X) powders and pellets. This International Standard is used for the determination of the U mass fraction and the O/U-ratio of nuclear grade uranium dioxide. The precision and accuracy stated in 8.2 are valid, if the total amount of impurities in the sample does not exceed the figures given in 8.2. An impurity correction in the U mass fraction and the O/U-ratio determination should be performed, if the amount of total impurities in oxide form exceeds 1 500 μg per gram of sample. Lower impurity levels influence the O/U-ratio by less than 0,000 5 and can be neglected. The non-volatile impurities shall be determined by an appropriate technique, and the correction applied. If the total content of the non-volatile impurities in oxide form is greater than 1 500 μg per gram of sample, the overall precision of the method depends on the accuracy of these impurity measurements. If no impurity correction is made and if the enrichment of the sample is not considered as described in 8.11, the precision and accuracy figures will be poorer than in 8.2.