ISO 8300:2013 PDF

Name: ISO 8300:2013 — Nuclear fuel technology — Determination of plutonium content in plutonium dioxide of nuclear grade quality — Gravimetric method
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Nuclear fuel technology — Determination of plutonium content in plutonium dioxide of nuclear grade quality — Gravimetric method

Название (английский):

ISO 8300:2013

Nuclear fuel technology — Determination of plutonium content in plutonium dioxide of nuclear grade quality — Gravimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 9 декабря 2013 г.
Издание:: ISO IS 8300 edition 2 version 1
ICS:: 27.120.30

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Описание (английский):

ISO 8300:2013 specifies a precise and accurate gravimetric method for determining the plutonium content in plutonium dioxide (PuO2) of nuclear grade quality, containing a mass fraction of less than 0,65 % of non-volatile impurities. The method is used to cross-check accountancy analyses of plutonium dioxide.

Abstract

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Overview

ISO 8300:2013 defines a gravimetric method for the determination of plutonium content in nuclear‑grade plutonium dioxide (PuO2). The procedure is intended for PuO2 containing less than 0.65% mass fraction of non‑volatile impurities and is primarily used to cross‑check material accountancy and assay results. The method yields a stoichiometric, stable, non‑hygroscopic PuO2 by controlled high‑temperature treatment and subsequent weighing, with overall single‑determination standard deviation on the order of 0.05% for the gravimetric step.

Key Topics

Principle: sampling and precise weighing in a dry atmosphere, heating in air at 1 200 °C to 1 250 °C to constant mass, impurity measurement and correction, and calculation of plutonium concentration using a gravimetric conversion factor that depends on isotopic composition.

Sampling & handling: transfer of bulk material to sealed vials, rapid movement to a dry glovebox (dew point ≤ −40 °C), and sub‑sampling (typical sub‑sample ≈ 1.5 g).

Weighing & apparatus: analytical balance accurate to ±0.1 mg, platinum crucibles pre‑tared by heating to constant mass, muffle furnace capable of 1 200–1 250 °C, desiccators and stainless steel sampling vials.

Heating regime: repeated 1‑hour heatings at 1 200–1 250 °C followed by cooling and weighing until mass change is ≤ ±0.1 mg, ensuring stoichiometric PuO2.

Impurity correction: measure non‑volatile impurities (µg·g−1) and apply conversion factors (see Annex A) to correct the gravimetric result; uncorrected non‑volatile impurities produce a positive bias.

Isotopic analysis: determine mean relative atomic mass of plutonium (Ā(Pu))-commonly by mass spectrometry-to calculate the gravimetric conversion factor.

Precision and uncertainty: gravimetric repeatability ≈ 0.05%. Total uncertainty including impurity correction can remain below 0.1% if impurity analyses meet specified precision levels.

Applications

Cross‑checking accountancy measurements of nuclear‑grade PuO2 in fuel cycle facilities and laboratories.

Independent verification of plutonium assays used for safeguards, inventory control, and regulatory compliance.

Reference method for laboratories requiring a high‑accuracy, stoichiometry‑based plutonium determination.

Related Standards

ISO/TC 85 committee publications on nuclear fuel technology and safeguards procedures.

National and international guidance on isotopic measurement (mass spectrometry) for mean atomic mass determination.

For implementation, laboratories should follow the documented procedure for sampling, taring, heating and weighing, perform a complete impurity analysis when necessary, and include full uncertainty reporting and test‑report elements as specified in the standard.

ISO 8300:2013 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

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