Nuclear fuel technology - Determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry (ISO 8299:2019)

This document specifies a method for the determination of the isotopic and elemental uranium and plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass spectrometry.
The method applies to uranium and plutonium isotope composition and concentration measurement of irradiated Magnox and light water reactor fuels (boiling water reactor or pressurized water reactor), in final products at spent-fuel reprocessing plants, and in feed and products of MOX and uranium fuel fabrication. The method is applicable to other fuels, but the chemical separation and spike solution are, if necessary, adapted to suit each type of fuel.

Kernbrennstofftechnologie - Bestimmung des Isotopengehaltes und der natürlichen Uran- und Plutoniumkonzentrationen kerntechnischer Werkstoffe in Salpetersäure-Lösungen durch Massenspektrometrie mit Wärmeionisation (ISO 8299:2019)

Technologie du combustible nucléaire - Détermination de la teneur isotopique et des concentrations en matériaux nucléaires de l'uranium et du plutonium dans une solution d'acide nitrique par spectrométrie de masse à thermoionisation (ISO 8299:2019)

Tehnologija jedrskih goriv - Ugotavljanje deleža izotopov ter koncentracije jedrskih snovi elementarnega urana in plutonija v raztopinah dušikove kisline s termoionizacijsko masno spektrometrijo (ISO 8299:2019)

General Information

Status
Published
Public Enquiry End Date
16-Dec-2020
Publication Date
21-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Feb-2021
Due Date
25-Apr-2021
Completion Date
22-Feb-2021

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SLOVENSKI STANDARD
SIST EN ISO 8299:2021
01-april-2021

Tehnologija jedrskih goriv - Ugotavljanje deleža izotopov ter koncentracije jedrskih

snovi elementarnega urana in plutonija v raztopinah dušikove kisline s
termoionizacijsko masno spektrometrijo (ISO 8299:2019)

Nuclear fuel technology - Determination of the isotopic and elemental uranium and

plutonium concentrations of nuclear materials in nitric acid solutions by thermal-

ionization mass spectrometry (ISO 8299:2019)

Technologie du combustible nucléaire - Détermination de la teneur isotopique et des

concentrations en matériaux nucléaires de l'uranium et du plutonium dans une solution

d'acide nitrique par spectrométrie de masse à thermoionisation (ISO 8299:2019)
Ta slovenski standard je istoveten z: EN ISO 8299:2021
ICS:
27.120.30 Cepljivi materiali in jedrska Fissile materials and nuclear
gorivna tehnologija fuel technology
SIST EN ISO 8299:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8299:2021
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SIST EN ISO 8299:2021
EN ISO 8299
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 27.120.30
English Version
Nuclear fuel technology - Determination of the isotopic
and elemental uranium and plutonium concentrations of
nuclear materials in nitric acid solutions by thermal-
ionization mass spectrometry (ISO 8299:2019)
Technologie du combustible nucléaire - Détermination
de la teneur isotopique et des concentrations en
matériaux nucléaires de l'uranium et du plutonium
dans une solution d'acide nitrique par spectrométrie
de masse à thermoionisation (ISO 8299:2019)
This European Standard was approved by CEN on 18 January 2021.

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, Turkey 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8299:2021 E

worldwide for CEN national Members.
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SIST EN ISO 8299:2021
EN ISO 8299:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 8299:2021
EN ISO 8299:2021 (E)
European foreword

The text of ISO 8299:2019 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 8299:2021 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 August 2021, and conflicting national standards shall

be withdrawn at the latest by August 2021.

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.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 8299:2019 has been approved by CEN as EN ISO 8299:2021 without any modification.

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SIST EN ISO 8299:2021
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SIST EN ISO 8299:2021
INTERNATIONAL ISO
STANDARD 8299
Third edition
2019-01
Nuclear fuel technology —
Determination of the isotopic and
elemental uranium and plutonium
concentrations of nuclear materials
in nitric acid solutions by thermal-
ionization mass spectrometry
Technologie du combustible nucléaire — Détermination de la
teneur isotopique et des concentrations en matériaux nucléaires de
l'uranium et du plutonium dans une solution d'acide nitrique par
spectrométrie de masse à thermoionisation
Reference number
ISO 8299:2019(E)
ISO 2019
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SIST EN ISO 8299:2021
ISO 8299:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 8299:2021
ISO 8299:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reference materials and reagents ..................................................................................................................................................... 2

5.1 Spikes and reference materials ................................................................................................................................................. 2

5.2 Other chemical reagents ................................................................................................................................................................. 3

5.3 Resin, applicable for separation/purification of Pu and U ................................................................................ 4

5.3.1 General...................................................................................................................................................................................... 4

5.3.2 Preparation of resin ...................................................................................................................................................... 4

6 Apparatus ..................................................................................................................................................................................................................... 5

7 Apparatus for mass spectrometry ...................................................................................................................................................... 6

8 Sample preparation ........................................................................................................................................................................................... 6

8.1 Subsampling and spiking ............................................................................................................................................................... 6

8.1.1 Pellet or powder samples ......................................................................................................................................... 7

8.1.2 Concentrated nuclear fuel solution samples (such as reprocessing solution) ........... 7

8.1.3 Plutonium nitrate solution samples (such as product solution from a

reprocessing plant) ........................................................................................................................................................ 7

8.1.4 Dried nitrate samples .................................................................................................................................................. 8

8.2 Chemical valency adjustment ..................................................................................................................................................... 8

8.2.1 Valence adjustment with ferrous solution ................................................................................................. 8

8.2.2 Valence adjustment with hydrogen peroxide ......................................................................................... 8

8.3 Sample separation/purification ............................................................................................................................................... 9

8.3.1 Ion exchange with anion-exchange resin .................................................................................................... 9

8.3.2 Purification with extraction separation resins (see 5.3.1.2) ...................................................10

8.4 Replicate treatments .......................................................................................................................................................................10

9 Filaments preparation .................................................................................................................................................................................10

9.1 Degassing of filaments ...................................................................................................................................................................10

9.2 Sample loading .....................................................................................................................................................................................10

9.2.1 Normal sample loading ...........................................................................................................................................10

9.2.2 Graphite loading technique .................................................................................................................................10

9.2.3 Resin-bead loading on single filaments for Pu samples ..............................................................11

9.3 Filament mounting (filament assemblies preparation) ...................................................................................11

10 Instrument calibration ................................................................................................................................................................................11

10.1 Mass calibration ..................................................................................................................................................................................11

10.2 Gain calibration for Faraday multi-detectors ............................................................................................................11

10.3 Faraday detector calibration ....................................................................................................................................................11

10.4 Mass discrimination calibration ...........................................................................................................................................12

11 Isotopic mass spectrometric measurements .......................................................................................................................12

11.1 Total evaporation measurements using a single or double filament assembly and a

multi-Faraday collector system .............................................................................................................................................12

11.2 Bias correction method using a double filament assembly and a multi-Faraday

collector system ..................................................................................................................................................................................13

12 Calculation of the results ..........................................................................................................................................................................13

12.1 Calculation of ion current intensities ...............................................................................................................................13

12.2 Calculation of mean, weighted mean and standard deviation on a set of ratios x ,

(i = 1…N) ....................................................................................................................................................................................................14

12.3 Mass discrimination correction .............................................................................................................................................14

12.4 Calculation of the atomic percent abundance A ...................................................................................................14

© ISO 2019 – All rights reserved iii
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SIST EN ISO 8299:2021
ISO 8299:2019(E)

12.5 Calculation of the isotopic mass percent W ..............................................................................................................15

12.6 Calculation of concentration ....................................................................................................................................................15

12.7 Isotope decay correction .............................................................................................................................................................16

13 Blanks ...........................................................................................................................................................................................................................16

14 Quality control .....................................................................................................................................................................................................16

15 Measurement uncertainty .......................................................................................................................................................................17

15.1 Elemental assay ...................................................................................................................................................................................17

15.2 Isotopic analysis ..................................................................................................................................................................................17

16 Interferences .........................................................................................................................................................................................................18

Annex A (normative) Preparation and standardization of spike solutions ..............................................................19

Bibliography .............................................................................................................................................................................................................................25

iv © ISO 2019 – All rights reserved
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SIST EN ISO 8299:2021
ISO 8299:2019(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

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 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 8299:2005), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— the procedure for the preparation of resin used for separation and purification of the samples has

been added in 5.3;

— sample preparation procedure from pellet, powder and other material forms to the solution has

been added in 8.1;

— uncertainty of the measurement is considered in Clause 15 instead of repeatability and accuracy.

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.
© ISO 2019 – All rights reserved v
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SIST EN ISO 8299:2021
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SIST EN ISO 8299:2021
INTERNATIONAL STANDARD ISO 8299:2019(E)
Nuclear fuel technology — Determination of the isotopic
and elemental uranium and plutonium concentrations
of nuclear materials in nitric acid solutions by thermal-
ionization mass spectrometry
1 Scope

This document specifies a method for the determination of the isotopic and elemental uranium and

plutonium concentrations of nuclear materials in nitric acid solutions by thermal-ionization mass

spectrometry.

The method applies to uranium and plutonium isotope composition and concentration measurement of

irradiated Magnox and light water reactor fuels (boiling water reactor or pressurized water reactor),

in final products at spent-fuel reprocessing plants, and in feed and products of MOX and uranium fuel

fabrication. The method is applicable to other fuels, but the chemical separation and spike solution are,

if necessary, adapted to suit each type of fuel.
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.

ISO 10980, Validation of the strength of reference solutions used for measuring concentrations

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:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Principle

The described method is based on isotope ratio measurements by thermal ionization mass spectrometry

(TIMS). TIMS analysis requires isotope separation of different elements that have the same or similar

238 241 238

masses as an isotope of the element being measured, such as U and Am influences Pu and

241

Pu. Separation method for Pu and U using columns purifications are described in Clause 8. Other

separation methods may be used provided that they lead to a separation of similar quality. Column

extraction chromatography described in ISO 15366 (all parts) is an example of a suitable alternative.

The described method consists of two separate TIMS measurements:
a) Isotopic measurement

One measurement is made to determine the isotopic composition of the element in the sample. The

238

Pu isotope abundance is determined by combining mass spectrometry following the present

238

method and alpha spectrometry as described in ISO 11483, if the interference of the isobar U is

not eliminated by chemical separation.
© ISO 2019 – All rights reserved 1
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SIST EN ISO 8299:2021
ISO 8299:2019(E)
b) Element concentration measurement

A second measurement is made on a sample and a spike mixture consisting of an artificially

enriched isotope of the element to be analysed. The sample element concentration is determined

by calculating the difference of isotopic composition before and after the sample spike mixture.

This method of measuring an element’s concentration is called isotope dilution mass spectrometry

(IDMS). The spiking can be made using a spike isotope that either is present, only minimally

233 244

present, or absent in the non-spiked sample. The use of U or Pu spikes can eliminate the

need for an isotope measurement in the non-spiked sample to determine uranium and plutonium

concentration. Although it is normally of interest to measure both the isotopic composition and

239

the element concentration. It is also more common to use a less expensive spike made from Pu,

240 242 235

Pu, Pu or U. Accurate measurements made on the masses of the sample and spike in the

mixture are required for the IDMS method. It is necessary that the isotopic composition and the

concentration of the spike be known or measured accurately and has small uncertainties. The IDMS

calculations are described in 12.6.
The IDMS method includes the following steps:
— sample dilution by mass if necessary;
— aliquoting and spike addition by mass;

— valency adjustment and isotope-exchange chemistry resulting in an isotopically equilibrated

mixture;
— chemical purification/separation;
— sample loading and oxidation on filaments;
— isotope ratio measurements by TIMS on spiked and non-spiked fractions.
This procedure describes two methods of TIMS measurements:

— Total evaporation (TE), multi-Faraday collector measurements. This method consumes the

whole sample. The ion beam of the element is totally collected. There are several advantages

with this method. It allows precise measurements of small sample amounts, can easily

calculate the mass discrimination factor and is easily adopted for automatic measurements.

The TE method relies almost entirely on separate measurements of standards to calculate

measurement uncertainty and precision.

— Bias correction method (conventional multi-Faraday collector measurements). In the bias

correction method, the different isotopes are collected in a limited period of the sample

evaporation. The data are collected in blocks, typically containing 10 to 20 sets (scans) of

measurements. With the bias correction method, it is possible to calculate the precision

of the ratio measurements within each block and between blocks and to use the internal

precision data to assess measurement quality on a filament-by-filament basis.
5 Reference materials and reagents

The solutions listed below are prepared from analytical grade reagents unless it is specified otherwise.

5.1 Spikes and reference materials

Reference materials and reference solutions to confirm instrument performance and spikes for the

isotope-dilution are shown below.

5.1.1 Uranium standard reference solution, prepared by one of the following methods:

— from natural uranium metal with an elemental concentration certified to 0,05 % (k = 2) or better,

such as NBL-CRM-112A (ex NBS-960D), EC-101, CETAMA-MU-2;
2 © ISO 2019 – All rights reserved
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SIST EN ISO 8299:2021
ISO 8299:2019(E)

— from other uranium metal, powder or pellet with an elemental concentration certified to 0,05 %

(k = 2) or better, such as NBL-CRM-116-A (HEU metal), CRM-125-A(UO pellet) and CRM-129 (U O

2 3 8
powder).

5.1.2 Plutonium standard reference solution, prepared by one of the following methods:

— plutonium metal with an elemental concentration certified to 0,05 % (k = 2) or better, such as NBL-

239

CRM-126 or 126-A, EC-201, CETAMA-MP2 or NBS-949, with a Pu isotopic abundance of 90 % or

240

more, certified to 0,05 % (k = 2) or better; the same isotopic abundance requirements apply if Pu,

242 244
Pu or Pu is used as the spike isotope;
240 242 244

— certified plutonium standard solution enriched in Pu, Pu or Pu isotope in case where 97 %

239
enriched Pu is used as a spike.

For both U and Pu standard reference solutions, other standard solutions traceable to these CRMs or

verified by means of a laboratory intercomparison can also be used. See Annex A and ISO 10980 for the

preparation and validation of these solutions.

5.1.3 Uranium spike, of certified isotopic and chemical composition, such as IRMM-040, IRMM-

041, IRMM-042, NBL-CRM-111A (ex NBS-995), NBL-CRM-135 or NBL-CRM-U930D.

5.1.4 Plutonium spike, of certified isotopic and chemical composition, such as IRMM-041, IRMM-

242 244

043, IRMM-044, IRMM-049, NBL-CRM-130 ( Pu nitrate), NBL-CRM-131 ( Pu nitrate, ex NBS-996),

240 242 244 239

NBL-CRM-144 (mixture of Pu, Pu, and Pu nitrates), NBL-CRM-126 (97 % enriched Pu metal),

239 239
NBL-CRM-126A (93 % enriched Pu metal) or CETAMA-MP2 (97 % enriched Pu metal).

5.1.5 Mixed uranium/plutonium spike solution, of certified isotopic and chemical composition,

233 242 235

such as IRMM-046 (mixed U/ Pu spike). Also, nitrate solution containing 0,2 - 0,3 mg/g U and

242

1 - 2 μg/g Pu, prepared from reference materials such as NBL-CRM-135 or NBL-CRM-U930D and

IRMM-049 or NBL-CRM-130.

5.1.6 Large-size dried (LSD) spike, of certified isotopic and chemical composition and dried,

235

such as IRMM-1027 series, containing about 50 mg of 20 % enriched U and 1 mg or 2 mg of 90 % or

239
higher enriched Pu.
235 242

5.1.7 Mixed uranium/plutonium spike, containing 0,2 - 0,3 mg/g of U and 1 - 2 µg/g of Pu in

nitric acid, 7 mol/l, prepared from certified materials such as NBL-CRM-135 or NBL-CRM-U930-D, and

IRMM-049 or NBL-CRM-130.

NOTE If certified spikes 5.1.3, 5.1.4, 5.1.5, 5.1.6 or 5.1.7 are not available, an in-house LSD spike, prepared by

mixing uranium CRMs (such as NBL-CRM-112A (natural uranium) and/or NBL-CRM-116 or 116A) and plutonium

CRM (NBL-CRM-126 or 126A or CETAMA-MP2) or by reference solutions (see 5.1.1 and 5.1.2) can also be applied.

The desired spikes can be prepared and standardized in accordance with ISO 10980. Suitable

procedures are described in Annex A.
Hereafter, dried spike, solution spike and LSD spike are called spike.
5.1.8 Ce
...

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