ISO 9005:2007 PDF

Name: ISO 9005:2007 — Nuclear energy — Uranium dioxide powder and sintered pellets — Determination of oxygen/uranium atomic ratio by the amperometric method
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Nuclear energy — Uranium dioxide powder and sintered pellets — Determination of oxygen/uranium atomic ratio by the amperometric method

Название (английский):

ISO 9005:2007

Nuclear energy — Uranium dioxide powder and sintered pellets — Determination of oxygen/uranium atomic ratio by the amperometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 14 февраля 2007 г.
Издание:: ISO IS 9005 edition 2 version 1
ICS:: 27.120.30

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Описание (английский):

ISO 9005:2007 specifies an analytical method for the determination of the oxygen/uranium ratio in uranium dioxide powder and sintered pellets. The method is applicable to reactor grade samples of hyper-stoichiometric uranium dioxide powder and pellets. The presence of reducing agents or residual organic additives invalidates the procedure.

Abstract

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Другие стандарты ISO

Overview

ISO 9005:2007 specifies an analytical amperometric method for determining the oxygen/uranium atomic ratio (O/U) in uranium dioxide (UO2) powder and sintered pellets used in nuclear energy. The standard applies to reactor-grade, hyper-stoichiometric UO2. It defines sample preparation, reagents, apparatus, dissolution and titration procedures, endpoint detection, calculation of the O/U ratio and reporting requirements. Note: the procedure is invalid if reducing agents or residual organic additives are present.

Key topics and technical requirements

Scope and applicability: Reactor-grade, hyper-stoichiometric UO2 powders and pellets; excludes samples containing reducing agents or organics.

Principle: Dissolve the sample in orthophosphoric acid (which does not oxidize U(IV)); quantify U(VI) by titration with standardized ammonium iron(II) sulfate. The excess oxygen is proportional to U(VI).

Reagents: Analytical-grade orthophosphoric acid (purified for highly sintered material), concentrated nitric acid (for purification), standardized ammonium iron(II) sulfate solution, certified U3O8 standard solution.

Apparatus: Inert dissolution assemblies (Types A and B), platinum electrode assembly, bi‑amperometric endpoint‑detection circuit, piston burette, thermostatic heating.

Sample preparation:

Powders: typically analyzed as received.
Sintered pellets: crushing under inert atmosphere and sieving to 150–250 µm to avoid re-oxidation; whole pellets may be used but increase dissolution time.
Highly sintered pellets: dissolution in purified phosphoric acid at elevated temperature (up to 275 °C) under N2/CO2.

Procedure: Heat sample in phosphoric acid under inert atmosphere where required, titrate cooled solution while detecting endpoint amperometrically (sudden current increase between polarized platinum electrodes).

Calculations and precision: O/U ratio is computed from titrant volume, titrant concentration and sample mass. Documented precision: one standard deviation ~0.003 for powder (mean R = 2.069) and ~0.0005 for pellets (mean R = 2.0044).

Applications and users

Nuclear fuel manufacturers and fabricators verifying stoichiometry of UO2 pellets and powders.

Analytical and quality‑control laboratories performing routine or certification testing of reactor fuel materials.

Research & development groups studying fuel behavior, oxidation states and stoichiometry effects.

Regulators and inspection bodies requiring standardized measurement methods for compliance and safety assessment.

Related standards

Developed by ISO/TC 85 (Nuclear energy), Subcommittee SC 5 (Nuclear fuel technology). Users should consult other ISO nuclear fuel standards and national regulatory guidance for complementary test methods, material specifications and quality management requirements.

Keywords: ISO 9005:2007, uranium dioxide, UO2, oxygen/uranium atomic ratio, amperometric method, titration, ammonium iron(II) sulfate, orthophosphoric acid, nuclear fuel quality.

ISO 9005:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

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