Nuclear energy. Evaluation of homogeneity of Gd distribution within gadolinium fuel blends and determination of Gd2O3 content in gadolinium fuel pellets by measurements of uranium and gadolinium elements (ISO 16424:2012)
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ISO 16424:2012 is applicable to the evaluation of the homogeneity of Gd distribution within gadolinium fuel blends, and the determination of the Gd2O3 content in sintered fuel pellets of Gd2O3+UO2 from 1 % to 10 %, by measurements of gadolinium (Gd) and uranium (U) elements using ICP-AES. After performing measurements of Gd and U elements using ICP-AES, if statistical methodology is additionally applied, homogeneity of Gd distribution within a Gd fuel pellet lot can also be evaluated. However, ISO 16424:2012 covers the statistical methodology only on a limited basis.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Principle
4 Apparatus
4.1 High dispersion direct reading ICP-AES
4.2 Analytical balance
4.3 Small stainless steel spoon
5 Reagents
6 Reference solutions
6.1 Gadolinium element reference solutions
6.2 Uranium element reference solutions
7 Sample preparation
7.1 Sample preparation for evaluation of Gd homogeneity in gadolinium fuel blend
7.2 Sample preparation for determining the Gd2O3 content of Gd fuel pellets
8 Calibration and analysis of the samples
8.1 Calibration of Gd peak line intensity
8.2 Calibration of U peak line intensity
8.3 Evaluation of Gd homogeneity in gadolinium fuel blend
8.4 Determination of Gd2O3 content in gadolinium fuel pellet
9 Precision
10 Test report
Annex A Calibration and Gd and U measurement uncertainties (informative)
Annex B Derivation of O/M and O/U ratio formulas (informative)
Annex C Evaluation of Gd2O3 measurement precision (informative)