SIST EN ISO 21484:2019 PDF

Name: SIST EN ISO 21484:2019 — Nuclear Energy - Fuel technology - Determination of the O/M ratio in MOX pellets by the gravimetric method (ISO 21484:2017)
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Nuclear Energy - Fuel technology - Determination of the O/M ratio in MOX pellets by the gravimetric method (ISO 21484:2017)

Название (английский):

SIST EN ISO 21484:2019

Nuclear Energy - Fuel technology - Determination of the O/M ratio in MOX pellets by the gravimetric method (ISO 21484:2017)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 3 июля 2019 г.
Издание:: ISO 21484:2017
ICS:: 17.240

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Описание (английский):

ISO 21484:2017 describes a method for determining the Oxygen-to-Metal (O/M) ratio in mixed uranium-plutonium oxide (U,Pu)O2 ± X pellets. The parameters given in the following paragraphs are relevant for pellets within a range of O/M ratio corresponding to 1,98 to 2,01. The method described in the document is adapted, with regard to the parameters, if the expected values of O/M ratio are outside the range.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

EN ISO 21484:2019 - "Nuclear energy - Fuel technology - Determination of the O/M ratio in MOX pellets by the gravimetric method" (ISO 21484:2017) specifies a laboratory gravimetric procedure to determine the oxygen-to-metal (O/M) ratio in mixed uranium‑plutonium oxide (MOX) (U,Pu)O2±x pellets. The published parameters apply primarily to pellets with O/M values in the range 1.98 to 2.01. The method uses controlled oxidation–reduction heat treatment and mass measurement to establish the stoichiometric deviation X by converting the sample to an O/M of exactly 2.000.

Key topics and technical requirements

Principle: Adjust sample O/M to 2.000 by controlled oxidation–reduction and calculate initial O/M from the mass change.

Scope limits: Parameter recommendations target O/M 1.98–2.01; parameters are adaptable for values outside this range.

Reagents and gases:

Nitric acid (50 % v/v) for crucible cleaning.
Purge gases: high‑purity air, inert gas (argon or nitrogen) or hydrogen/mixtures; purity recommendations and limits for O2/H2O/N2 impurities are specified.

Apparatus and consumables:

Furnace capable up to ~950 °C (muffle or equivalent, e.g., IR lamp heating) with gas sweeping control.
Platinum or quartz crucibles.
Analytical balance with at least ±0.1 mg accuracy for typical samples (±0.01 mg for very small samples).

Sampling & sample preparation: Representative sampling from pellet batches; precautions to avoid oxidation during handling (e.g., argon atmosphere, argon‑filled containers).

Procedure highlights:

Crucible cleaning and pre‑weighing.
Weigh sample + crucible, perform heat‑treatment cycles (example cycles provided: argon → air → argon → argon+H2 at ~900 °C with specified hold times).
Final weighing and calculation of mean atomic mass and O/M ratio.

Quality characteristics: The standard includes sections on calculation, precision, accuracy, sensitivity and required content for the test report.

Applications and users

Quality control and acceptance testing in MOX fuel fabrication.

Analytical and research laboratories in nuclear fuel technology, including fuel manufactories and regulatory/inspection bodies.

R&D groups assessing stoichiometry, fuel performance, and process control for mixed‑oxide pellets.

Useful for safety and compliance checks where precise oxygen content affects thermal, mechanical and irradiation behavior of MOX fuels.

Related standards

EN ISO 21484:2019 is the CEN adoption of ISO 21484:2017; it was prepared under ISO/TC 85 (Nuclear energy). Users often apply this method alongside standards for MOX fabrication, fuel characterization and radiochemical analysis (consult national and CEN references for complementary standards).

Keywords: EN ISO 21484:2019, O/M ratio, MOX pellets, gravimetric method, (U,Pu)O2, oxygen‑to‑metal ratio, nuclear fuel analysis, muffle furnace, analytical balance.

SIST EN ISO 21484:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 21484:2017

Nuclear Energy — Fuel technology — Determination of the O/M ratio in MOX pellets by the gravimetric method

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