IEC 62646:2012
(Main)Nuclear power plants - Control rooms - Computer based procedures
Nuclear power plants - Control rooms - Computer based procedures
IEC 62646:2012 establishes requirements for the whole life cycle of operating procedures that the designer wishes to computerise. It also provides guidance for making decisions about which types of procedures are to be computerised and to what extent. Once computerised, procedures are designated as "Computer Based Procedures" (CBP).
Centrales nucléaires de puissance - Salles de commande - Procédures informatisées
La CEI 62646:2012 établit des exigences pour l'ensemble du cycle de vie des procédures de conduite que le concepteur souhaite informatiser. Elle fournit aussi des recommandations pour prendre les décisions concernant le choix des procédures à informatiser et le niveau d'informatisation de celles-ci. Une fois informatisées, ces procédures sont nommées "procédures informatisées" (PI).
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Standards Content (Sample)
IEC 62646
®
Edition 1.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Control rooms – Computer based procedures
Centrales nucléaires de puissance – Salles de commande – Procédures
informatisées
IEC 62646:2012
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IEC 62646
®
Edition 1.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Control rooms – Computer based procedures
Centrales nucléaires de puissance – Salles de commande – Procédures
informatisées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 27.120.20 ISBN 978-2-83220-388-0
Warning! Make sure that you obtained this publication from an authorized distributor.
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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – 62646 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
1.1 Object . 8
1.2 CBP overview . 8
1.3 Exclusions from this standard . 9
1.4 Organisation of this standard . 9
2 Normative references . 10
3 Terms and definitions . 10
4 Abbreviations . 12
5 CBP policy requirements . 12
5.1 General . 12
5.2 Computerisation policy . 13
5.2.1 General . 13
5.2.2 Preliminary considerations . 13
5.2.3 Final decision on use of CBP . 14
5.3 Families of CBP . 15
5.4 Overview of computerisation features . 16
5.4.1 General . 16
5.4.2 Global requirements for computerisation . 16
5.4.3 CBP guidance. 16
5.4.4 Procedure based automation . 17
5.5 Output documentation . 18
6 Use of CBP . 18
6.1 General . 18
6.2 Environment of use . 18
6.2.1 General . 18
6.2.2 Use of CBP in computerised control rooms . 18
6.2.3 Use of CBP in a conventional or hybrid main control room . 18
6.2.4 Use of CBP in conjunction with paper based procedures . 19
6.2.5 Use of CBP outside the main control room . 19
6.3 Assistance to operators activities . 20
6.3.1 General . 20
6.3.2 Assistance to primary activities of the operator . 20
6.3.3 Assistance to secondary activities of the operator. 20
6.4 Operator coordination . 21
6.5 Output documentation . 21
7 CBP system . 21
7.1 General . 21
7.2 Safety requirements . 22
7.3 Integration of the CBP system into the HMI system . 22
7.4 CBP system independent from the HMI system . 22
7.4.1 General . 22
7.4.2 Non-safety requirements. 22
7.4.3 Connections between the CBP system and the HMI system . 23
7.4.4 Maintenance of the CBP system . 23
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62646 © IEC:2012 – 3 –
7.5 CBP system failure . 23
7.6 Output documentation . 24
8 Detailed design requirements . 24
8.1 General . 24
8.2 Basic CBP features . 24
8.2.1 General . 24
8.2.2 Basic features necessary for CBP. 24
8.2.3 Presentation rules . 25
8.2.4 CBP display format layout . 25
8.2.5 Requirements for presentation of individual display elements . 26
8.3 Information given by CBP . 26
8.3.1 General . 26
8.3.2 Information for family 1 CBP . 26
8.3.3 Information for family 2 CBP . 26
8.3.4 Information for family 3 CBP . 27
8.4 Navigation . 27
8.4.1 General . 27
8.4.2 Navigation for family 1 CBP . 27
8.4.3 Navigation for family 2 and family 3 CBP . 28
8.5 CBP guidance . 28
8.5.1 General . 28
8.5.2 CBP access . 28
8.5.3 Diagnosis assistance . 28
8.5.4 Decision assistance . 29
8.5.5 Computerisation of CBP guidance . 29
8.6 Procedure based automation . 29
8.6.1 General . 29
8.6.2 Interactions between operators and procedure based automation . 30
8.6.3 Design of CBP to control the plant . 30
8.7 Other CBP facilities . 30
8.8 Output documentation . 31
9 CBP life cycle . 31
9.1 General . 31
9.2 Project organisation . 31
9.3 Project team . 32
9.4 Verification and validation programme . 32
9.5 CBP Programming . 32
9.6 Verification and validation of CBP . 33
9.6.1 General . 33
9.6.2 Technical verification of CBP . 33
9.6.3 Functional and ergonomic validation . 33
9.7 CBP deployment. 34
9.8 Output documentation . 35
9.9 CBP and CBP system maintenance . 35
9.10 Training of the operating staff . 35
Bibliography . 37
Table 1 – CBP Families . 15
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
CONTROL ROOMS –
COMPUTER BASED PROCEDURES
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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International Standard IEC 62646 has been prepared by subcommittee 45A: Instrumentation
and control of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation.
The text of this standard is based on the following documents:
FDIS Report on voting
45A/886/FDIS 45A/888/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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62646 © IEC:2012 – 5 –
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related to the specific publication. At this date, the publication will be
• reconfirmed,
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INTRODUCTION
a) Technical background, main issues and organisation of the Standard
This IEC standard focuses on computerisation of procedures used by the operating staff.
Procedures have always contributed to a large extent to NPP safety and availability and,
now, the use of computer technology to provide enhanced guidance to the plant operators
is increasing and becoming current practice. This standard also provides guidance for the
decision on the extent the procedures should be computerised.
It is intended that the Standard be used by nuclear power plant designers, utilities
operating staff, systems evaluators and by regulatory engineers.
b) Situation of the current Standard in the structure of the IEC SC 45A standard series
IEC 62646 is the third level IEC SC 45A document tackling the generic issue of
computerised procedures.
IEC 62646 is to be read in association with IEC 60964 and with IEC 61839. IEC 60964 is
the appropriate IEC SC 45A document providing guidance on operator controls,
verification and validation of design, application of visual display units in the control room,
whereas IEC 61839 establishes functional analysis and assignment guidance for allocating
functions between operators and systems.
For more details on the structure of the IEC SC 45A standard series, see the item d) of
this introduction.
c) Recommendations and limitations regarding the application of the Standard
It is important to note that this Standard establishes no additional functional requirements
for safety systems.
This standard deals with technical requirements and Human Factor Engineering related to
Computer Based Procedures (CBP). However it does not provide detailed guidance on
ergonomic design of control centres as it is treated in the ISO 11064 series of standards,
nor on task allocation between human and systems dealt with in IEC 61839 and on cyber
security, which is developed in IEC 62645. It also excludes the organisation for
maintenance of procedures.
Aspects for which requirements and recommendations have been provided in this
Standard are:
– the establishment of a policy for computerisation of procedures, especially which types
of procedure should be computerised and to what extent. The different families of CBP
(Computer Based Procedures) to be aimed at, with their associated features, are then
defined. Finally, the safety aspects of CBP are considered;
– the use of CBP inside and outside of the MCR (Main Control Room), in possible
conjunction with paper based procedures, as well as the assistance provided to
operator activities, including user coordination;
– safety and non safety design requirements for the digital system processing CBP, and
considerations about what to do in case of failure of this system;
– detailed requirements and recommendations related to the functional features of CBP,
from the basic ones to the most sophisticated ones, i.e. information, navigation,
guidance and plant control;
– the CBP life cycle, from the set-up of the project to the CBP maintenance and the
operator training via design and implementation.
To ensure that the standard will continue to be relevant in future years, the emphasis has
been placed on issues of principle, rather than on specific technologies.
d) Description of the structure of the IEC SC 45A standard series and relationships
with other IEC documents and other bodies documents (IAEA, ISO)
The top-level document of the IEC SC 45A standard series is IEC 61513. It provides
general requirements for I&C systems and equipment that are used to perform functions
important to safety in NPPs. IEC 61513 structures the IEC SC 45A standard series.
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62646 © IEC:2012 – 7 –
IEC 61513 refers directly to other IEC SC 45A standards for general topics related to
categorization of functions and classification of systems, qualification, separation of
systems, defence against common cause failure, software aspects of computer-based
systems, hardware aspects of computer-based systems, and control room design. The
standards referenced directly at this second level should be considered together with
IEC 61513 as a consistent document set.
At a third level, IEC SC 45A standards not directly referenced by IEC 61513 are standards
related to specific equipment, technical methods, or specific activities. Usually these
documents, which make reference to second-level documents for general topics, can be
used on their own.
A fourth level extending the IEC SC 45A standard series, corresponds to the Technical
Reports which are not normative.
IEC 61513 has adopted a presentation format similar to the basic safety publication
IEC 61508 with an overall safety life-cycle framework and a system life-cycle framework.
Regarding nuclear safety, it provides the interpretation of the general requirements of
IEC 61508-1, IEC 61508-2 and IEC 61508-4, for the nuclear application sector, regarding
nuclear safety. In this framework IEC 60880 and IEC 62138 correspond to IEC 61508-3 for
the nuclear application sector. IEC 61513 refers to ISO as well as to IAEA GS-R-3 and
IAEA GS-G-3.1 for topics related to quality assurance (QA).
The IEC SC 45A standards series consistently implements and details the principles and
basic safety aspects provided in the IAEA code on the safety of NPPs and in the IAEA
safety series, in particular the Requirements NS-R-1, establishing safety requirements
related to the design of Nuclear Power Plants, and the Safety Guide NS-G-1.3 dealing with
instrumentation and control systems important to safety in Nuclear Power Plants. The
terminology and definitions used by SC 45A standards are consistent with those used by
the IAEA.
NOTE It is assumed that for the design of I&C systems in NPPs that implement conventional safety functions
(e.g. to address worker safety, asset protection, chemical hazards, process energy hazards) international or
national standards would be applied, that are based on the requirements of a standard such as IEC 61508.
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NUCLEAR POWER PLANTS –
CONTROL ROOMS –
COMPUTER BASED PROCEDURES
1 Scope
1.1 Object
This International Standard establishes requirements for the whole life cycle of operating
procedures that the designer wishes to computerise. It also provides guidance for making
decisions about which types of procedures are to be computerised and to what extent. Once
computerised, procedures are designated as "Computer Based Procedures" (CBP).
Enhancing safety, easing operation and increasing NPP availability have always been greatly
valued aims which, during NPP operation, rely to a large extent on the operating staff and on
operating procedures. Digital technology is currently contributing by providing efficient help to
do this at the automation level.
In addition, the use of computer technology to provide formats of operating procedures to the
1
plant operators , on-line and in real time, is increasing and becoming current practice. This
can be done both for normal operating situations and also as advisory formats for use in
abnormal situations. When properly implemented and kept up-to-date, such operating
procedures can provide enhanced support for greater safety and operator effectiveness
compared to paper based procedures. Their preparation demands great care and close
interaction with operators and plant designers, and will also need close co-operation with I&C
designers.
CBP have many common points with paper based procedures. This standard focuses only on
what is specific to CBP.
1.2 CBP overview
Procedures provide the operators with two types of high level elements:
• information, i.e. explanations or data displayed in order to enable the operator to control
the process, assess the plant situation, understand operating strategies and make
appropriate decisions,
• guidance, i.e. a set of ordered steps for prompting and helping the operator to operate the
process and the plant equipment.
Information and guidance are combined to minimise operators errors and to optimise
efficiency of plant operation.
These elements can be of a varying level of detail depending on the procedure policy, which
aims to benefit from operator experience and predefined guidelines.
Computerisation of procedures can provide, according to the specified design policy:
• enhanced process and plant equipment information,
• enhanced operator guidance,
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Oper
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