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STANDARD 24390
First edition
2023-11
Nuclear energy — Nuclear fuel
technology — Methodologies for
radioactivity characterization of very
low-level waste (VLLW) generated by
nuclear facilities
Énergie nucléaire — Technologie du combustible nucléaire —
Méthodologies pour l'évaluation de la radioactivité des déchets de
Très Faibles Activité (TFA) produits par les installations nucléaires
Reference number
ISO 24390:2023(E)
© ISO 2023
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ISO 24390:2023(E)
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© ISO 2023
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Published in Switzerland
ii
© ISO 2023 – All rights reserved
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ISO 24390:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Waste acceptance criteria (WAC) for VLLW . 3
5 Radioactivity characterization . 4
5.1 Principle of radioactivity characterization of VLLW. 4
5.1.1 Requirements and limits . 4
5.1.2 Measurement methodology . 4
5.2 Process for radioactivity characterization of VLLW . 5
5.2.1 General . 5
5.2.2 Step 1: Investigation of waste characteristics . 6
5.2.3 Step 2: Surface scanning . 8
5.2.4 Step 3: Gamma activity measurement . 9
5.2.5 Step 4: Destructive analysis . 10
5.3 Decision thresholds . 10
5.4 Correlation of measurement methods . 11
5.5 Scaling factor method .12
5.6 Radionuclide vector method .
...