ISO 8299:2019 PDF

Nuclear fuel technology — Determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry

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Title (English):

ISO 8299:2019

Nuclear fuel technology — Determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 25
Publication date:: January 30, 2019
Edition:: ISO IS 8299 edition 3 version 1
ICS:: 27.120.30

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Description (English):

This document specifies a method for the determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry. The method applies to uranium and plutonium isotope composition and concentration measurement of irradiated Magnox and light water reactor fuels (boiling water reactor or pressurized water reactor), in final products at spent-fuel reprocessing plants, and in feed and products of MOX and uranium fuel fabrication. The method is applicable to other fuels, but the chemical separation and spike solution are, if necessary, adapted to suit each type of fuel.

Technical details

Technical committee: ISO/TC 85/SC 5 - Nuclear installations, processes and technologies
SKU: ISO 8299:2019

Abstract

Overview

ISO 8299:2019 specifies a validated laboratory method for determining the isotopic and elemental concentrations of uranium (U) and plutonium (Pu) in nitric acid solutions using thermal‑ionization mass spectrometry (TIMS). The standard addresses both isotopic composition analysis and isotope‑dilution mass spectrometry (IDMS) concentration measurements for irradiated fuels (Magnox and light‑water reactors), spent‑fuel reprocessing streams, and feed/products of MOX and uranium fuel fabrication. The procedure is adaptable to other fuel types with appropriate chemical separation and spike adjustments.

Key technical topics and requirements

Analytical principle: TIMS isotope‑ratio measurements and IDMS for elemental assay (Clauses 4, 11–12).
Sample preparation: Subsampling, spiking, valence adjustment and chemical separation for pellets, powders, concentrated solutions and dried nitrates (Clause 8).
Separation media: Resin selection and preparation for U/Pu purification; ion‑exchange and extraction chromatography options (Clauses 5.3, 8.3).
Spike and reference materials: Preparation and standardization of spike solutions for IDMS (Annex A; Clause 5.1).
Filament and TIMS operation: Filament degassing, loading techniques (graphite, resin‑bead), filament assembly, and measurement modes (total evaporation, bias‑correction) (Clause 9, 11).
Instrument calibration: Mass, detector gain, Faraday calibration, and mass‑discrimination correction procedures (Clause 10, 12.3).
Data treatment: Calculation of ion currents, weighted means, atomic percent, isotopic mass percent, concentration, and decay correction (Clause 12).
Quality assurance: Blanks, QC procedures, and comprehensive treatment of measurement uncertainty and interferences (Clauses 13–16).

Practical applications and users

ISO 8299:2019 is intended for:

Nuclear fuel analytical laboratories performing U/Pu isotopic and concentration assays.
Spent‑fuel reprocessing facilities and MOX/uranium fuel fabrication plants monitoring feed and product streams.
Safeguards, regulatory and quality‑assurance teams requiring standardized, traceable TIMS protocols.
Research institutions studying reactor‑irradiated materials and method development for nuclear forensics.

Typical uses include inventory verification, process monitoring in reprocessing plants, compositional control for fuel fabrication, and supporting nuclear safeguards and compliance reporting.

Related standards

ISO 15366 (column extraction chromatography methods) - alternative separation techniques.
ISO 11483 (alpha spectrometry) - complementary technique when isobaric interferences remain.
ISO 10980 - validation of reference solution strengths.

Keywords: ISO 8299:2019, TIMS, thermal‑ionization mass spectrometry, IDMS, uranium plutonium isotopic analysis, nuclear fuel reprocessing, nitric acid solutions, MOX, measurement uncertainty.

Related standards

Standards mentioned in the description

Abstract

Overview

Key technical topics and requirements

Analytical principle: TIMS isotope‑ratio measurements and IDMS for elemental assay (Clauses 4, 11–12).
Sample preparation: Subsampling, spiking, valence adjustment and chemical separation for pellets, powders, concentrated solutions and dried nitrates (Clause 8).
Separation media: Resin selection and preparation for U/Pu purification; ion‑exchange and extraction chromatography options (Clauses 5.3, 8.3).
Spike and reference materials: Preparation and standardization of spike solutions for IDMS (Annex A; Clause 5.1).
Filament and TIMS operation: Filament degassing, loading techniques (graphite, resin‑bead), filament assembly, and measurement modes (total evaporation, bias‑correction) (Clause 9, 11).
Instrument calibration: Mass, detector gain, Faraday calibration, and mass‑discrimination correction procedures (Clause 10, 12.3).
Data treatment: Calculation of ion currents, weighted means, atomic percent, isotopic mass percent, concentration, and decay correction (Clause 12).
Quality assurance: Blanks, QC procedures, and comprehensive treatment of measurement uncertainty and interferences (Clauses 13–16).

Practical applications and users

ISO 8299:2019 is intended for:

Nuclear fuel analytical laboratories performing U/Pu isotopic and concentration assays.
Spent‑fuel reprocessing facilities and MOX/uranium fuel fabrication plants monitoring feed and product streams.
Safeguards, regulatory and quality‑assurance teams requiring standardized, traceable TIMS protocols.
Research institutions studying reactor‑irradiated materials and method development for nuclear forensics.

Typical uses include inventory verification, process monitoring in reprocessing plants, compositional control for fuel fabrication, and supporting nuclear safeguards and compliance reporting.

Related standards

ISO 15366 (column extraction chromatography methods) - alternative separation techniques.
ISO 11483 (alpha spectrometry) - complementary technique when isobaric interferences remain.
ISO 10980 - validation of reference solution strengths.

Keywords: ISO 8299:2019, TIMS, thermal‑ionization mass spectrometry, IDMS, uranium plutonium isotopic analysis, nuclear fuel reprocessing, nitric acid solutions, MOX, measurement uncertainty.

ISO 8299:2019 PDF

Technical details

Abstract

Overview

Key technical topics and requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key technical topics and requirements

Practical applications and users

Related standards

Related standards

Nuclear fuel technology - Chemical separation and purification of uranium and plutonium in nitric acid soluti…

Preparation of plutonium sources and determination of 238Pu/239Pu isotope ratio by alpha spectrometry

Validation of the strength of reference solutions used for measuring concentrations