EN ISO 13465:2026

SLOVENSKI STANDARD
01-oktober-2026
Jedrska energija - Tehnologija jedrskega goriva - Ugotavljanje neptunija v
raztopinah dušikove kisline s spektrofotometrijo (ISO 13465:2024)
Nuclear energy - Nuclear fuel technology - Determination of neptunium in nitric acid
solutions by spectrophotometry (ISO 13465:2024)
Kernenergie - Kernbrennstofftechnik - Spektralphotometrische Bestimmung von
Neptunium in salpetersauren Lösungen (ISO 13465:2024)
Énergie nucléaire - Technologie du combustible nucléaire - Détermination du neptunium
dans les solutions d'acide nitrique par spectrophotométrie (ISO 13465:2024)
Ta slovenski standard je istoveten z: EN ISO 13465:2026
ICS:
27.120.30 Cepljivi materiali in jedrska Fissile materials and nuclear
gorivna tehnologija fuel technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13465
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2026
EUROPÄISCHE NORM
ICS 27.120.30
English Version
Nuclear energy - Nuclear fuel technology - Determination
of neptunium in nitric acid solutions by
spectrophotometry (ISO 13465:2024)
Énergie nucléaire - Technologie du combustible Kernenergie - Kernbrennstofftechnik -
nucléaire - Détermination du neptunium dans les Spektralphotometrische Bestimmung von Neptunium
solutions d'acide nitrique par spectrophotométrie (ISO in salpetersauren Lösungen (ISO 13465:2024)
13465:2024)
This European Standard was approved by CEN on 10 August 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13465:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 13465:2024 has been prepared by Technical Committee ISO/TC 85 "Nuclear energy,
nuclear technologies, and radiological protection” of the International Organization for Standardization
(ISO) and has been taken over as EN ISO 13465:2026 by Technical Committee CEN/TC 430 “Nuclear
energy, nuclear technologies, and radiological protection” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2027, and conflicting national standards
shall be withdrawn at the latest by February 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 13465:2024 has been approved by CEN as EN ISO 13465:2026 without any modification.

International
Standard
ISO 13465
Third edition
Nuclear energy — Nuclear fuel
2024-11
technology — Determination of
neptunium in nitric acid solutions
by spectrophotometry
Énergie nucléaire — Technologie du combustible nucléaire —
Détermination du neptunium dans les solutions d'acide nitrique
par spectrophotométrie
Reference number
ISO 13465:2024(en) © ISO 2024
ISO 13465:2024(en)
© ISO 2024
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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 13465:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Interferences . 1
5.1 Uranium (VI) .1
5.2 Acidity .2
5.3 Plutonium .2
5.4 Redox species .2
5.5 Nitrite ions . .2
6 Reagents . 2
7 Apparatus . 4
8 Measurement . 4
8.1 Calibration .4
8.2 Sample preparation .4
8.2.1 Neptunium calibration solution .4
8.2.2 Sample solution .5
8.3 Spectrophotometer setup .5
8.4 Measurement .5
8.4.1 Measurement on the calibration solution .5
8.4.2 Measurement on the sample solution .6
9 Expression of the results . 6
9.1 Calculation of the neptunium concentration in the sample .6
9.2 Reproducibility .7
9.3 Detection limit .7
Bibliography . 8

iii
ISO 13465:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
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 third edition cancels and replaces the second edition (ISO 13465:2009), which has been technically
revised.
The main changes are as follows:
— Clause 3 and 5.3 added;
— 9.2 and 9.3 updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO 13465:2024(en)
Introduction
This document presents an analytical method for determining the neptunium concentration in nitric acid
solutions after the dissolution of nuclear reactor irradiated fuels. The method is devoted to process controls
at the different steps of the process in a nuclear fuel reprocessing plant.

v
International Standard ISO 13465:2024(en)
Nuclear energy — Nuclear fuel technology — Determination
of neptunium in nitric acid solutions by spectrophotometry
1 Scope
This document specifies an analytical method for determining the neptunium concentration by
spectrophotometry, with spectrophotometer implemented in hot cell or glove box allowing the analysis of
high activity solutions, with a standard uncertainty, with coverage factor k = 1 of about 5 %, in nitric acid
solutions after the dissolution of nuclear reactor irradiated fuels, at different steps of the process in a nuclear
fuel reprocessing plant or in other nuclear facilities. The method is applicable to sample from the process
-1 -1
containing a concentration of neptunium between 10 mg·l and 400 mg·l and uranium concentrations of
-1
up to 300 g·l .
2 Normative references
The following documents are referred to in the text in such a way that some or all of their co
...