ISO 24390:2023

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 24390
ISO/TC 85/SC 5
Nuclear energy — Nuclear fuel
Secretariat: BSI
technology — Methodologies for
Voting begins on:
2023-08-25 radioactivity characterization of very
low-level waste (VLLW) generated by
Voting terminates on:
2023-10-20
nuclear facilities
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 24390:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 24390:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 24390
ISO/TC 85/SC 5
Nuclear energy — Nuclear fuel
Secretariat: BSI
technology — Methodologies for
Voting begins on:
radioactivity characterization of very
low-level waste (VLLW) generated by
Voting terminates on:
nuclear facilities
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 24390:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 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 . 3
5.1 Principle of radioactivity characterization of VLLW. 3
5.1.1 Requirements and limits . 3
5.1.2 Measurement methodology . 4
5.2 Process for radioactivity characterization of VLLW . 4
5.2.1 General . 4
5.2.2 Step 1: Investigation of waste characteristics .
...

ISO/FDIS 24390:2023(E)
ISO/TC 85/SC 5/WG 5
Secretariat: BSI
Date: 2023-05-0708-10
Nuclear energy — Nuclear fuel technology — — Methodologies for
radioactivity characterization of very low-level waste (VLLW)
generated by nuclear facilities
FDIS stage
© ISO 2023 – All rights reserved

---------------------- Page: 1 ----------------------
ISO/FDIS 24390:2023(E)
© ISO 20222023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO'sISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CP 401 • Ch. de Blandonnet 8
CH-12111214 Vernier, Geneva 20
Tel.Phone: + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail: copyright@iso.org
Web Website: www.iso.org
Published in Switzerland.
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 24390:2023(E)
Contents
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 . 12
5.5 Scaling factor method . 12
5.6 Radionuclide vector method . 13
6 Sampling . 13
6.1 General .
...