Nuclear fuel technology Uranium dioxide powder and pellets Determination of uranium and oxygen/uranium ratio by gravimetric method with impurity correction

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

27-07-2004

Publisher

International Organization for Standardization

ISO 12795:2004 specifies a method of determining the mass fraction of uranium and the oxygen-to-uranium atomic ratio in hyperstoichiometric uranium dioxide (UO_2+X) powders and pellets.

ISO 12795:2004 is used for the determination of the U mass fraction and the O/U-ratio of nuclear grade uranium dioxide.

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 micrograms 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 micrograms per gram of sample, the overall precision of the method depends on the accuracy of these impurity measurements.

DevelopmentNote	Supersedes ISO/DIS 12795 (07/2004)
DocumentType	Standard
Pages	7
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
NEN ISO 12795 : 2004	Identical
NF ISO 12795 : 2006	Identical

ISO 9989:1996	Determination of uranium in uranium dioxide powder and pellets Iron(II) sulfate reduction/potassium dichromate oxidation titrimetric method
ISO 3696:1987	Water for analytical laboratory use — Specification and test methods