ISO/FDIS 4917-5
(Main)Design of nuclear power plants against seismic events — Part 5: Seismic instrumentation
Design of nuclear power plants against seismic events — Part 5: Seismic instrumentation
This document shall apply to nuclear power plants with water cooled reactors. For other nuclear facilities the applicability of the document must be checked in advance, before it might be applied correspondingly.
Conception parasismique des installations nucléaires — Partie 5: Instrumentation pour la détection et l'enregistrement des séismes
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Design of nuclear power plants
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against seismic events —
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Part 5:
Seismic instrumentation
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Conception parasismique des installations nucléaires —
Partie 5: Instrumentation pour la détection et l'enregistrement
des séismes
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ISO/TC 85/SC 6
Design of nuclear power plants
Secretariat: DIN
against seismic events —
Voting begins on:
Part 5:
Seismic instrumentation
Voting terminates on:
Conception parasismique des installations nucléaires —
Partie 5: Instrumentation pour la détection et l'enregistrement
des séismes
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© ISO 2024
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for the seismic instrumentation . 2
4.1 General requirements .2
4.2 Instrument location .3
5 Instrumentation characteristics . 4
5.1 General requirements .4
5.2 Acceleration acquisition system .4
6 Actuation and alarms . . 6
7 Documentation . 7
Bibliography . 8
iii
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 document 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 6, Reactor technology.
A list of all parts in the ISO 4917 series can be found on the ISO website.
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
Introduction
Objective of the seismic instrumentation is to ascertain whether a seismic event has occurred at the site of
the nuclear power plant and to determine the size of this seismic event in relation to the one on which the
design of the plant was based.
v
FINAL DRAFT International Standard ISO/FDIS 4917-5:2024(en)
Design of nuclear power plants against seismic events —
Part 5:
Seismic instrumentation
1 Scope
This document specifies the utilization and characteristics of instrumentation used to detect seismic events
at nuclear power plants with water cooled reactors. The document can also be applied to other nuclear
facilities after verifying its applicability.
The following types of electrical systems and equipment are not covered by this document:
— seismic instrumentation involved in the implementation of nuclear safety functions as defined by
IEC 61226, for example automatic shutdown systems;
— seismic instrumentation not involved in the implementation of nuclear safety functions as defined by
IEC 61226 but which due, for example, to close proximity to other safety classified systems, requires
hardware qualification to be performed.
Such systems are specified, designed, manufactured, qualified, operated and dismantled according to the
relevant requirements of IEC standards, in particular IEC 61513 and the lower level IEC standards according
to the safety class and technologies used.
Seismic instrumentation used for the implementation of seismic reactor trip systems are developed
according to the requirements of IEC 63186.
An automatic shutdown system is not covered by this document.
This document specifies the requirements to be fulfilled by the seismic instrumentation such that, firstly,
it can be ascertained whether any of the design quantities on which the plant walk-down level and the
inspection levels are based have been exceeded and that, secondly, the recording of the time history of the
earthquake provides the necessary input values for a post-seismic analysis. The requirements are specified
such that, independent of the detection and recording system, comparable results within tolerances are
achieved in the time range as well as the frequency range.
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 4917-1, Design of nuclear power plants against seismic events — Part 1: Principles
ISO 4917-6, Design of nuclear power plants against seismic events — Part 6: Post-seismic measures
IEC 61226, Nuclear power plants — Instrumentation, control and electrical power systems important to safety
— Categorization of functions and classification of systems
IEC/IEEE 60780-323, Nuclear facilities — Electrical equipment important to safety — Qualification
IEC/IEEE 60980-344, Nuclear facilities — Equipment important to safety — Seismic qualification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
acceleration sensor
sensor to detect the accelerations in three orthogonal directions and convert the accelerations into
transferable signals
3.2
acceleration acquisition system
system of different components that measures and records the absolute acceleration components as a
function of time
Note 1 to entry: The acceleration acquisition system essentially consists of several acceleration sensors (3.1), recording
devices (3.5) and seismic triggers (3.6), not necessarily located in one device.
3.3
aliasing effects
errors that occur, if a sampled signal contains frequencies higher than half of the sampling rate (Nyquist-
Frequency)
3.4
amplitude frequency response
frequency dependent relation between the real occurred and the instrumentally displayed amplitude of
acceleration
3.5
recording device
device that records measurement values as a function of time
3.6
trigger
electro-mechanical or logic device that initiates a corrective or protective action whenever a setpoint value
is crossed
Note 1 to entry: Lower and upper setpoints are common in numerous control systems, hence "exceeded" does not
apply in the literal sense.
3.7
setpoint
predetermined threshold value at which follow-up actions are initiated
4 Requirements for the seismic instrumentation
4.1 General requirements
The seismic instrumentation system being installed in the NPP is in general an individual I&C system part
of the overall I&C system of the NPP. The seismic instrumentation system shall be classified according to its
importance to safety. Classification shall be performed in accordance with the requirements of IEC 61226 or
other equivalent practices for NPPs.
The seismic instrumentation shall be seismically qualified for operability during and after a seismic event-
according to relevant IEC standards.
Concerning the qualification of the system, IEC/IEEE 60780-323 or equivalent requirements shall be applied,
in particular and specifically for seismic qualification IEC/IEEE 60980-344 or equivalent shall be applied.
The seismic instrumentation shall be provided with the objective of
a) detecting and quantifying the seismic effects at the plant site and at the power plant itself,
b) measuring the accelerations, recording the acceleration time histories and storing these data, and
c) enabling the comparison (of these data) with the design quantities basic to the design of the power plant.
It shall be ensured that, whenever trigger levels are exceeded, these are detected and displayed by the
seismic instrumentation for the plant inspections specified in ISO 4917-1.
NOTE 1 Plant inspections in buildings containing safety-related components are addressed in ISO 4917-6. The
definitio
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4917-5
ISO/TC 85/SC 6 Secretariat: DIN
Voting begins on: Voting terminates on:
2023-12-25 2024-03-18
Design of Nuclear Power Plants against Seismic Events —
Part 5:
Seismic Instrumentation
Conception parasismique des installations nucléaires —
Partie 5: Instrumentation pour la détection et l'enregistrement des séismes
ICS: 27.120.20; 91.120.25
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4917-5:2023(E)
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 SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 4917-5:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4917-5
ISO/TC 85/SC 6 Secretariat: DIN
Voting begins on: Voting terminates on:
Design of Nuclear Power Plants against Seismic Events —
Part 5:
Seismic Instrumentation
Conception parasismique des installations nucléaires —
Partie 5: Instrumentation pour la détection et l'enregistrement des séismes
ICS: 27.120.20; 91.120.25
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
Email: copyright@iso.org
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 4917-5:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 4917-5:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for the seismic instrumentation . 2
4.1 General requirements . 2
4.2 Instrument location . 3
5 Instrumentation characteristics .4
5.1 General requirements . 4
5.2 Acceleration acquisition system . 5
6 Actuation and alarms . .6
7 Documentation . 7
Bibliography . 8
iii
ISO/DIS 4917-5:2023(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 Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,
and radiological protection, Subcommittee SC 6, Reactor technology.
A list of all parts in the ISO 4917 series can be found on the ISO website.
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/DIS 4917-5:2023(E)
Introduction
Objective of the seismic instrumentation is to ascertain whether a seismic event has occurred at the
site of the nuclear power plant and to determine the size of this seismic event in relation to the one on
which the design of the plant was based.
v
DRAFT INTERNATIONAL STANDARD ISO/DIS 4917-5:2023(E)
Design of Nuclear Power Plants against Seismic Events —
Part 5:
Seismic Instrumentation
1 Scope
This document specifies the utilization and characteristics of instrumentation used to detect seismic
events at nuclear power plants with water cooled reactors. The document can also be applied to other
nuclear facilities after verifying its applicability.
The following types of electrical systems and equipment are not covered by this document:
— Seismic instrumentation involved in the implementation of nuclear safety functions as defined by
IEC 61226, for example automatic shutdown systems.
— Seismic instrumentation not involved in the implementation of nuclear safety functions as defined
by IEC 61226 but which due, for example, to close proximity to other safety classified systems,
requires hardware qualification to be performed.
Such systems are to be specified, designed, manufactured, qualified, operated and dismantled according
to the relevant requirements of IEC standards, in particular IEC 61513 and the lower level IEC standards
according to the safety class and technologies used.
Seismic instrumentation used for the implementation of seismic reactor trip systems are to be
developed according to the requirements of IEC 63186.
An automatic shutdown system is not covered by this document.
This document specifies the requirements to be fulfilled by the seismic instrumentation such that,
firstly, it can be ascertained whether any of the design quantities on which the plant walk-down
level and the inspection levels are based have been exceeded and that, secondly, the recording of the
time history of the earthquake provides the necessary input values for a post-seismic analysis. The
requirements are specified such that, independent of the detection and recording system, comparable
results within tolerances are achieved in the time range as well as the frequency range.
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 4917-1, Design of nuclear power plants against seismic events — Part 1: Principles
ISO 4917-6, Design of nuclear power plants against seismic events — Part 6: Post-seismic measures
IEC 63186, Nuclear power plants — Instrumentation and control systems important to safety — Criteria
for seismic trip system
IEC 61226, Nuclear power plants — Instrumentation, control and electrical power systems important to
safety — Categorization of functions and classification of systems
IEC 61513, Nuclear power plants — Instrumentation and control systems important to safety — General
requirements for systems
ISO/DIS 4917-5:2023(E)
IEC/IEEE 60780-323, Nuclear facilities — Electrical equipment important to safety — Qualification
IEC/IEEE 60980-344, Nuclear facilities — Equipment important to safety — Seismic qualification
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:
— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
acceleration sensor
sensor to detect the accelerations in three orthogonal directions and convert the accelerations into
transferable signals
3.2
acceleration acquisition system
system of different components that measures and records the absolute acceleration components as a
function of time
Note 1 to entry: The acceleration acquisition system essentially consists of several acceleration sensors (3.1),
recording devices (3.4) and seismic triggers (3.5), not necessarily located in one device.
3.3
aliasing effects
errors that occur, if a sampled signal contains frequencies higher than half of the sampling rate
(Nyquist-Frequency)
3.4
amplitude frequency response
frequency dependent relation between the real occurred and the instrumentally displayed amplitude
of acceleration
3.5
recording device
device that records measurement values as a function of time
3.6
trigger
electro-mechanical or logic device that initiates a corrective or protective action whenever a setpoint
value is crossed
Note 1 to entry: Lower and upper setpoints are common in numerous control systems, hence "exceeded" does not
apply in the literal sense.
3.7
setpoint
predetermined threshold value at which follow-up actions are initiated
4 Requirements for the seismic instrumentation
4.1 General requirements
The seismic instrumentation system being installed in the NPP is in general an individual I&C system
part of the overall I&C system of the NPP. According to the importance to safety of this system it shall
be classified according to relevant IEC standards.
ISO/DIS 4917-5:2023(E)
The seismic instrumentation shall be seismically qualified for operability during and after a seismic
event according to relevant IEC standards.
Concerning the qualification of the system, IEC/IEEE 60780-323 or equivalent requirements shall be
applied, in particular and specifically for seismic qualification IEC/IEEE 60980-344 or equivalent shall
be applied.
The seismic instrumentation shall be provided with the objective of
a) detecting and quantifying the seismic effects at the plant site and at the power plant itself,
b) measuring the accelerations, recording the acceleration time histories and storing these data, and
c) enabling the comparison (of these data) with the design quantities basic to the design of the power
plant.
It shall be ensured that, whenever trigg
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Design of nuclear power plants against seismic events —
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Seismic instrumentation
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Conception parasismique des installations nucléaires — —
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Copyright notice
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ISO/FDIS 4917-5:2024(en)
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in any form for any other purposeby any means, electronic or mechanical, including photocopying, or posting on the
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© ISO 2024 – All rights reserved
iii
ISO/FDIS 4917-5:2024(Een)
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Contents Page
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Formatted: HeaderCentered, Space After: 0 pt, Tab
Foreword . v
stops: Not at 8.75 cm
Formatted: Adjust space between Latin and Asian text,
Introduction . vi
Adjust space between Asian text and numbers, Tab stops:
1 Scope . 1 Not at 0.71 cm + 17.2 cm
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for the seismic instrumentation . 3
4.1 General requirements . 3
4.2 Instrument location . 4
5 Instrumentation characteristics . 5
5.1 General requirements . 5
5.2 Acceleration acquisition system. 5
6 Actuation and alarms . 7
7 Documentation . 8
Bibliography . 9
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for the seismic instrumentation . 3
4.1 General requirements . 3
4.2 Instrument location . 4
5 Instrumentation characteristics . 5
5.1 General requirements . 5
5.2 Acceleration acquisition systems. 5
6 Actuation and alarms . 7
7 Documentation . 8
Bibliography . 9
Formatted: FooterPageRomanNumber
iv
iv
ISO/FDIS 4917-5:2024(en)
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Formatted: Font: Bold
Formatted: HeaderCentered, Left
Foreword
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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 document 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).
Formatted: English (United Kingdom)
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.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.htmlwww.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.
A list of all parts in the ISO 4917 series can be found on the ISO website. Commented [eXtyles1]: Invalid reference: "ISO 4917
series"
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: Default Paragraph Font
complete listing of these bodies can be found at www.iso.org/members.html.www.iso.org/members.html.
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© ISO 2024 – All rights reserved
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ISO/FDIS 4917-5:2024(Een)
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Introduction
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Objective of the seismic instrumentation is to ascertain whether a seismic event has occurred at the site of the stops: Not at 8.75 cm
nuclear power plant and to determine the size of this seismic event in relation to the one on which the design
of the plant was based.
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FINAL DRAFT International Standard ISO/FDIS 4917-5:2024(en)
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Design of nuclear power plants against seismic events — —
cm
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Part 5:
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Seismic instrumentation
1 Scope
This document specifies the utilization and characteristics of instrumentation used to detect seismic events at
nuclear power plants with water cooled reactors. The document can also be applied to other nuclear facilities
after verifying its applicability.
The following types of electrical systems and equipment are not covered by this document:
— — seismic instrumentation involved in the implementation of nuclear safety functions as defined by Formatted: Adjust space between Latin and Asian text,
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IEC 61226, for example automatic shutdown systems;
Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — seismic instrumentation not involved in the implementation of nuclear safety functions as defined by
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IEC 61226 but which due, for example, to close proximity to other safety classified systems, requires
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Such systems are specified, designed, manufactured, qualified, operated and dismantled according to the
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relevant requirements of IEC standards, in particular I
...
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