SIST EN ISO 18229:2021

SLOVENSKI STANDARD
oSIST prEN ISO 18229:2021
01-junij-2021
Bistvene tehnične zahteve za mehanske komponente in kovinske konstrukcije,
namenjene četrti generaciji jedrskih reaktorjev (ISO 18229:2018)
Essential technical requirements for mechanical components and metallic structures
foreseen for Generation IV nuclear reactors (ISO 18229:2018)
Grundsätzliche technische Anforderungen an GEN IV-Atomreaktoren (ISO 18229:20108)
Exigences techniques essentielles pour les composants mécaniques et les structures
métalliques destinés aux réacteurs nucléaires de quatrième génération (ISO
18229:2018)
Ta slovenski standard je istoveten z: prEN ISO 18229
ICS:
27.120.10 Reaktorska tehnika Reactor engineering
oSIST prEN ISO 18229:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 18229:2021

---------------------- Page: 2 ----------------------
oSIST prEN ISO 18229:2021
INTERNATIONAL ISO
STANDARD 18229
First edition
2018-02
Essential technical requirements for
mechanical components and metallic
structures foreseen for Generation IV
nuclear reactors
Exigences techniques essentielles pour les composants mécaniques et
les structures métalliques prévus pour les réacteurs nucléaires de la
quatrième génération
Reference number
ISO 18229:2018(E)
©
ISO 2018

---------------------- Page: 3 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units of measurements . 4
5 Management system . 4
6 Technical requirements . 4
6.1 General . 4
6.2 Materials . 4
6.2.1 General. 4
6.2.2 Specification of materials . 5
6.2.3 Material conformity declaration . 7
6.3 Design . 7
6.3.1 General. 7
6.3.2 Damages . 7
6.3.3 Considerations for operating conditions and load combinations . 8
6.3.4 Criteria levels . 9
6.3.5 Corrosion, erosion, erosion-corrosion, wear .11
6.3.6 Attachments .11
6.3.7 Sudden variation in the mechanical properties at junctions .11
6.3.8 Nuclear cleanliness requirements .11
6.3.9 Thermal ageing.12
6.3.10 Irradiation .12
6.3.11 Design methods .12
6.4 Fabrication .13
6.4.1 General.13
6.4.2 Identification of materials/parts .14
6.4.3 Preparation of parts .14
6.4.4 Welding .14
6.4.5 Forming and dimension tolerances .16
6.4.6 Cleaning .17
6.4.7 Heat treatment.17
6.5 Tests and examination methods .17
6.5.1 General.17
6.5.2 Methods .17
6.5.3 Procedures .17
6.5.4 Personnel qualification .18
6.6 Final inspection and testing .18
6.6.1 Final inspection .18
6.6.2 Final pressure test .18
6.7 Marking/labelling .18
7 Documentation .19
8 Conformity assessment .19
Annex A (informative) Description of GEN IV reactors .20
Annex B (informative) Illustration of material selection for sodium fast reactor
(SFR) components .21
Annex C (informative) Description of types of damage .22
Annex D (informative) Documentation .25
© ISO 2018 – All rights reserved iii

---------------------- Page: 5 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

Bibliography .29
iv © ISO 2018 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(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 on 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 the following
URL: 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 6, Reactor technology.
© ISO 2018 – All rights reserved v

---------------------- Page: 7 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

Introduction
GEN IV reactors’ objectives are to meet reinforced requirements (compared to GEN II to III reactors)
concerning safety and reliability and linked with design and fabrication of equipment:
— to excel in safety and reliability;
— to eliminate the need for offsite emergency response;
— to have a very low likelihood and degree of reactor core damage.
This is supported with the use of codes or standards with a proven history of supporting public safety.
The purpose of this document is not to replace these codes or standards but to identify the essential
technical requirements which need to be addressed by the design and fabrication codes in order to
allow to meet such safety requirements at the expected level for the GEN IV reactors.
It enables these standards to co-exist, providing an approach that can accommodate technical
innovations, existing national frameworks and market needs.
vi © ISO 2018 – All rights reserved

---------------------- Page: 8 ----------------------
oSIST prEN ISO 18229:2021
INTERNATIONAL STANDARD ISO 18229:2018(E)
Essential technical requirements for mechanical
components and metallic structures foreseen for
Generation IV nuclear reactors
1 Scope
This document defines the essential technical requirements that are addressed in the process of design
and construction of Generation IV (GEN IV) nuclear reactors. It does not address operation, maintenance
and in-service inspection of reactors.
Six reactor concepts are considered for GEN IV: the sodium fast reactor, the lead fast reactor, the gas fast
reactor, the very high temperature reactor, the supercritical water reactor and the molten salt reactor.
Annex A details the main characteristics for the different concepts.
The scope of application of this document is limited to mechanical components related to nuclear safety
and to the prevention of the release of radioactive materials
— that are considered to be important in terms of nuclear safety and operability,
— that play a role in ensuring leaktightness, partitioning, guiding, securing and supporting, and
— that contain and/or are in contact with fluids (such as vessels, pumps, valves, pipes, bellows, box
structures, heat exchangers, handling and driving mechanisms).
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/IEC 17050-1, Conformity assessment — Supplier's declaration of conformity — Part 1: General
requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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/
3.1
certification
third-party attestation related to products, processes, systems or persons
[SOURCE: ISO 17000:2004, 5.5 modified — notes deleted]
3.2
component
part of equipment which can be considered as an individual item
© ISO 2018 – All rights reserved 1

---------------------- Page: 9 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

3.3
conformity
fulfilment of specified requirements
3.4
contractor
supplier (3.16) in a contractual situation
3.5
designer
organization or individual that performs design of components (3.2) in compliance with a number of
requirements, such as customer’s needs, nuclear safety rules, national and international standards,
good engineering practices
3.6
equipment specification
document used to specify technical and quality assurance requirements of the equipment
Note 1 to entry: The equipment specification specifies in particular:
— scope;
— scope of supplies (such as description, safety classification, quality grade, seismicity);
— reference documents, together with details of their conditions of application, where necessary.
Note 2 to entry: The equipment specification and a set of supplementary reports (operating conditions report,
limiting conditions definition report, interface reports, loading definition reports) contain all data required to
check the design rules according to the specified criteria level. All these data are designated by the general term
equipment specification.
Note 3 to entry: The equipment specification also addresses the design activities.
3.7
examination
activity carried out by qualified personnel using qualified procedures to assess that given products,
processes or services fulfil conformity (3.3)
3.8
inspector
person in charge of verifying the compliance of the documentation issued by a supplier (3.16) against
the technical attachments to the order
Note 1 to entry: The inspector is also the person in charge of verifying the correctness of certain fabrication
phases to which he or she is called to attend.
Note 2 to entry: The inspector can or cannot be a member of the supplier's staff.
3.9
manufacturer
legal entity responsible for final design, manufacturing, engineering, and for the construction of any
component (3.2) of the nuclear reactor
Note 1 to entry: Beyond the scope of mechanical components and metallic structures, different entities are
usually responsible for the functions of manufacturing, engineering and design. Sometimes, one entity could be
responsible for more than one of the mentioned functions (e.g. design and engineering).
2 © ISO 2018 – All rights reserved

---------------------- Page: 10 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

3.10
operating organization
legal entity having been duly authorized to implement and execute the operation of the nuclear
installation
Note 1 to entry: In the subject field, the concept is usually designated by the term “Operator” beginning with
capital letter.
3.11
prime contractor
legal entity granted that receives a major contract from the owner for providing a full provision of
either the nuclear island and/or the balance of plant
3.12
qualification
proof of suitability of an individual, product, process, procedure or service to fulfil specified
requirements
3.13
regulation
rules promulgated by a regulatory body in accordance with legal statutes or directives
3.14
standard
code
document established and approved by a standard issuing body that provides for common and repeated
use, mandatory requirements, guidelines or characteristics for activities or their results
Note 1 to entry: A code or standard can be approved by a safety authority, depending on the regulations (3.13) in
a given country.
3.15
subcontractor
any contractor (3.4), except for a prime contractor (3.11), providing supplies and/or services through a
contract passed with other project contractor or eventually the project management for specific items
Note 1 to entry: Some of these subcontractors will be explicitly named as tubes manufacturer (3.9), plates
manufacturer (rolling mill), forgings manufacturer (forging mill), pumps manufacturer, valves manufacturer.
3.16
supplier
individual and legal entity (steelmaker, forging mill, pipemaker, foundry, etc.) responsible for the
fabrication of products or parts on behalf of the manufacturer (3.9) or one subcontractor (3.15)
3.17
surveillance agent
person not subordinated to the supplier (3.16) concerned, commissioned to ensure that the component
(3.2) is constructed and inspected in compliance with the documents attached to the orders placed
with the supplier, with the present code and with the documents drawn up in application of the latter
3.18
testing
activity carried out to determine, by specific procedures, that one or more characteristic of a product,
process or service fulfil conformity (3.3)
3.19
inspection body
organization that performs inspections on any granted-by-contract service or supply as provided for
by standards (3.14) and is independent of the manufacturer (3.9), contracting party, owner or operating
organization (3.10)
© ISO 2018 – All rights reserved 3

---------------------- Page: 11 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

4 Units of measurements
Measurements shall be in SI units. Product standards that are available only in other units may
be used. Other cases are to be adopted with appropriate and consistent conversion factors to avoid
assembly/interface-related issues.
5 Management system
A management system shall be established and implemented that meets the requirements defined by
the IAEA.
6 Technical requirements
6.1 General
The use of a code or standard for the design of a component ensures structural integrity against loads
and combination of them, though some level of geometrical and functional damage can be present.
The user of a code or standard shall select the code/standard in adequacy with the component to be
designed.
The adequacy shall be evaluated on:
— the type of components (component function, component classification);
— relevant operating conditions such as pressure, temperature, flow rate, chemical environment, sort
and level of radiation;
— material;
— failure modes (include identification of possible loads and their combinations).
As standards or codes ensure consistency between the different steps of a component manufacturing
(material, design, fabrication), it is recommended to use consistent set of standards or codes for the
different steps of a component design.
If the code or standard does not fully cover the needs for design of the component, the user shall define
the complementary requirements to apply and shall verify the consistency between the different
requirements and the code.
In a reactor, it is possible to use different standards or codes for different components; nevertheless, it
will lead to define additional requirements to provide rules for consistency between equipment in the
same system built according to different standards or codes.
6.2 Materials
6.2.1 General
Materials of pressure-bearing parts, materials for non-pressure bearing parts (e.g. supports and
attachments) and welding consumables used for the manufacture of mechanical components shall be
suitable for intended application and to other foreseeable but unintended conditions.
Choosing a material referred to in a code or standard does not automatically assume its suitability for
use, as this is specifically dependent on the radiation field, physical and chemical environment (e.g.
incompatibility of aluminium with a sodium environment).
An identification system shall be established and maintained for materials used in fabrication so that
all materials can be traced to their origin. This includes the use of welding consumable.
4 © ISO 2018 – All rights reserved

---------------------- Page: 12 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

Annex B gives some illustrations of material selections for the different projects.
6.2.2 Specification of materials
The material properties shall:
a) be appropriate for all operating conditions that are reasonably foreseeable and for all test
conditions:
— in particular, they shall be sufficiently ductile and tough;
— they shall be sufficiently chemically resistant to the fluid contained in the component;
— they shall not be adversely affected at operating conditions (e.g. by ageing, creep, irradiation
embrittlement);
b) be suitable for the intended fabrication procedures;
c) be compatible with NDT methods needed for fabrication and in service inspection issues (NDT and
inspection feasibility are not only depending on the material selection, but material shall not be
incompatible with the selected methods).
A way to select a material may be to use a material file. A material file might contain the following parts:
a) Introduction
1) Material specification (including chemical composition, grade)
2) Codes and standards dealing with these parts or products
3) Procurement specifications
4) Industrial application and experience
b) Physical properties
c) Base metal and welded joints mechanical properties for design and analysis
1) Justification of the applicability of the design rules for the specified usage conditions
2) Basic mechanical properties
3) Mechanical properties needed for the specified usage conditions
4) Guaranty of the consistency between the properties of the final part laid-on the plant and the
material properties used to design the component
d) Manufacturing
1) Industrial experience
2) Metallurgy
e) Fabrication
1) Industrial experience
2) Forming operation ability
f) Welding
1) Weldability
2) Industrial experience for the welding procedure qualification
© ISO 2018 – All rights reserved 5

---------------------- Page: 13 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

3) Industrial experience for the welding repair procedure qualification
g) Capability to be inspected
h) In service behaviour
1) Thermal ageing, corrosion, erosion-corrosion, irradiation
6 © ISO 2018 – All rights reserved

---------------------- Page: 14 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

Once the material is selected, the way to procure it shall be described in a document (procurement
specification). This specification shall include:
a) Scope
b) Melting process
c) Chemical requirements
d) Manufacture (including forming, surface treatments, heat treatments)
e) Mechanical properties
f) Surface examination — Surface defects
g) Volumetric examination
h) Removal of unacceptable areas
i) Dimensional check
j) Marking
k) Cleanliness — Packaging — Transportation
l) Test reports
m) Acceptance criteria
6.2.3 Material conformity declaration
The component manufacturer shall take appropriate measures to ensure that materials used comply
with the requirements of specifications permitted by the applicable standards. The manufacturer
shall obtain material identification and linkability certification as required by the applicable material
specification.
6.3 Design
6.3.1 General
The aim of design rules is to ensure that the components are mechanically resistant under the various
mechanical loads and load combinations to which they could be exposed in specified operating
conditions.
The damages shall be identified, taking into account the elements (e.g. safety classification, functionality
of the components, operating conditions, component material) given by the equipment specification.
The adopted design standard might not cover other jeopardizing factors, such as erosion/corrosion, or
radiation embrittlement. For this reason, the designer shall identify additional standards or measures
to cope with these factors and apply their contents.
The design includes the identification of damages, the consideration of loads applied to the component,
the definition of criteria to apply to the design, the design by itself, the fabrication of the component, the
test and examinations needed to validate the fabrication and the establishment of the documentation.
6.3.2 Damages
The following is a list of the damages identified for the different types of reactors. A short definition of
the damages is given in Annex C. The design shall consider the following failure modes and specifically
© ISO 2018 – All rights reserved 7

---------------------- Page: 15 ----------------------
oSIST prEN ISO 18229:2021
ISO 18229:2018(E)

address those listed in the table identifying the damages which are likely to occur for the different type
of reactors:
— immediate excessive deformation;
— immediate plastic instability;
— time-dependent exce
...