ISO 16424:2012 PDF

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

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Title (English):

ISO 16424:2012

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: December 6, 2012
Edition:: ISO IS 16424 edition 1 version 1
ICS:: 27.120.30

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Description (English):

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.

Technical details

Technical committee: ISO/TC 85/SC 5 - Nuclear installations, processes and technologies
SKU: ISO 16424:2012

Abstract

Overview

ISO 16424:2012 specifies analytical procedures for evaluating the homogeneity of gadolinium (Gd) distribution in blended nuclear fuel powders and for determining Gd2O3 content in sintered Gd2O3+UO2 fuel pellets (mass fraction 1 % to 10 %) using inductively coupled plasma atomic emission spectrometry (ICP‑AES). The standard uses measured Gd and uranium (U) element concentrations and stoichiometric relationships (including the oxygen-to-metal, O/M, ratio) to calculate Gd2O3 content. It also provides a limited approach to statistical assessment of homogeneity within a pellet lot.

Key topics and technical requirements

Measurement technique: ICP‑AES (high dispersion direct‑reading) with sufficient resolution to report concentrations to two decimal places for the 1–100 mg/L range.
Recommended emission lines: Gd ~354.580 nm and U ~398.579 nm (other peaks may be used).
Calibration: use certified reference solutions - Gd at 5, 10 and 15 mg/L; U at 50, 70 and 100 mg/L - to build intensity vs. concentration regression curves.
Sample preparation: dissolve small, randomly taken powder or crushed pellet fragments in 50 % nitric acid; prepare sample solutions to yield U concentrations ≈ 50–100 mg/L.
Repetition and sampling: each sample solution is measured repeatedly (typically six replicates) and at least five independent samples are recommended for homogeneity evaluation.
Calculations: determine Gd2O3 mass fraction from measured Gd and U concentrations using stoichiometric formulas and O/M considerations; Annexes cover uncertainty and precision guidance.
Instrument and lab requirements: analytical balance sensitivity ±0.1 mg, micropipettes, PTFE/glassware, hot plate and percussion mortar are specified.

Applications and practical value

Quality control in nuclear fuel fabrication for Gd‑doped UO2 pellets used as burnable absorbers.
Incoming material inspection and homogeneity evaluation of powder blends to ensure consistent Gd distribution prior to sintering.
Verification of final pellet Gd2O3 content for specification compliance, material accounting and traceability.
Use by analytical laboratories, fuel manufacturers, regulatory bodies and R&D groups involved in nuclear fuel chemistry and metrology.

Who should use this standard

Nuclear fuel manufacturers and QA/QC laboratories
Analytical chemistry labs performing ICP‑AES on nuclear materials
Nuclear safeguards and materials accounting teams
Metrology institutes and certification bodies

Related standards

ISO 16796 - alternative ICP‑AES method for Gd2O3 determination (different methodology)
ISO 3696 - water for analytical laboratory use (referred in ISO 16424)
ISO 3951‑4 - statistical sampling procedures (for extended homogeneity/statistics guidance)

Keywords: ISO 16424, Gd2O3 content, gadolinium fuel pellets, ICP‑AES, gadolinium homogeneity evaluation, UO2, nuclear fuel quality control, O/M ratio.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Measurement technique: ICP‑AES (high dispersion direct‑reading) with sufficient resolution to report concentrations to two decimal places for the 1–100 mg/L range.
Recommended emission lines: Gd ~354.580 nm and U ~398.579 nm (other peaks may be used).
Calibration: use certified reference solutions - Gd at 5, 10 and 15 mg/L; U at 50, 70 and 100 mg/L - to build intensity vs. concentration regression curves.
Sample preparation: dissolve small, randomly taken powder or crushed pellet fragments in 50 % nitric acid; prepare sample solutions to yield U concentrations ≈ 50–100 mg/L.
Repetition and sampling: each sample solution is measured repeatedly (typically six replicates) and at least five independent samples are recommended for homogeneity evaluation.
Calculations: determine Gd2O3 mass fraction from measured Gd and U concentrations using stoichiometric formulas and O/M considerations; Annexes cover uncertainty and precision guidance.
Instrument and lab requirements: analytical balance sensitivity ±0.1 mg, micropipettes, PTFE/glassware, hot plate and percussion mortar are specified.

Applications and practical value

Quality control in nuclear fuel fabrication for Gd‑doped UO2 pellets used as burnable absorbers.
Incoming material inspection and homogeneity evaluation of powder blends to ensure consistent Gd distribution prior to sintering.
Verification of final pellet Gd2O3 content for specification compliance, material accounting and traceability.
Use by analytical laboratories, fuel manufacturers, regulatory bodies and R&D groups involved in nuclear fuel chemistry and metrology.

Who should use this standard

Nuclear fuel manufacturers and QA/QC laboratories
Analytical chemistry labs performing ICP‑AES on nuclear materials
Nuclear safeguards and materials accounting teams
Metrology institutes and certification bodies

Related standards

ISO 16796 - alternative ICP‑AES method for Gd2O3 determination (different methodology)
ISO 3696 - water for analytical laboratory use (referred in ISO 16424)
ISO 3951‑4 - statistical sampling procedures (for extended homogeneity/statistics guidance)

Keywords: ISO 16424, Gd2O3 content, gadolinium fuel pellets, ICP‑AES, gadolinium homogeneity evaluation, UO2, nuclear fuel quality control, O/M ratio.

ISO 16424:2012 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and practical value

Who should use this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and practical value

Who should use this standard

Related standards

Related standards

Nuclear energy — Determination of Gd2O3 content in gadolinium fuel blends and gadolinium fuel pellets by atom…

Water for analytical laboratory use — Specification and test methods

Nuclear energy. Evaluation of homogeneity of Gd distribution within gadolinium fuel blends and determination…

Sampling procedures for inspection by variables. Procedures for assessment of declared quality levels.