標準號：ISO 12795-2004
中文標準名稱：核燃料技術.二氧化鈾粉末和小球.帶雜質修正的重量分析法測定鈾和氧/鈾比率
英文標準名稱：Nuclear fuel technology - Uranium dioxide powder and pellets - Determination of uranium and oxygen/uranium ratio by gravimetric method with impurity correction
標準類型：F46
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：F46
國際標準分類號：27.120.30
適用范圍：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.