ISO 22875:2017 原子力エネルギー—二酸化ウラン粉末と焼結ペレット中の塩素とフッ素の測定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies and radiological protection, Subcommittee SC 5, Nuclear installations, processes and technologies.

This second edition cancels and replaces the first edition (ISO 22875:2008), which has been technically revised with the following changes:

• pyrohydrolysis temperature is lowered;
• information has been added concerning decomposition of species including fluoride and chloride (see footnote 2);
• calculation of the result takes into account pyrohydrolysis yield if needed.

Introduction

This document describes a method for determining the chlorine and fluorine concentrations in uranium dioxide and in sintered fuel pellets by pyrohydrolysis of samples, followed either by liquid ion-exchange chromatography or by selective electrode measurement of chlorine and fluorine ions.

Many ion chromatography systems and ion-selective electrode measurement systems are available. The equipment and operating procedure are, therefore, not described in detail.

1 Scope

This document describes a method for determining chlorine and fluorine in uranium dioxide powder and sintered pellets. It is applicable for the measurement of samples with a mass fraction of chlorine from 5 µg/g to 500 µg/g and with a mass fraction of fluorine from 2 µg/g to 500 µg/g.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography