Energy

CSA Scope

[Add the following to the last sentence of the first paragraph]

and at flow capacities up to and including 300 g/s.

[Add the following note]

NOTE 1A For North American application, all references to rated pressure are considered to be equivalent to maximum allowable working pressure (MAWP).

ISO Scope

This document specifies the requirements for wire or textile reinforced hoses and hose assemblies suitable for dispensing hydrogen up to 70 MPa nominal working pressure, in the operating temperature range of −40 °C to 65 °C.

This document specifies safety requirements for material, design, manufacture and testing of gaseous hydrogen hose and hose assemblies for hydrogen fuelling stations.

This document does not apply to the following hoses and hose assemblies:

a) those used as part of a vehicle high pressure on-board fuel storage system;

b) those used as part of a vehicle low pressure fuel delivery system; and

c) flexible metal hoses.

NOTE 1 This document was developed primarily for hoses and hose assemblies for dispensing high-pressure hydrogen from refuelling dispensers to hydrogen vehicles. ISO 16964 addresses hoses used to deliver hydrogen from a transportable vessel (e.g. trailer) into a buffer storage of a station.

NOTE 2 Hose assemblies include a hose with connectors on each end (see Figure 1). Each connector has two basic functional elements that are addressed as described below.

a) Coupling to hose. This function is defined by requirements and verified (along with the hose itself) by performance-based tests in this document.

b) Fitting for transition and connection to the piping system or equipment. This function is addressed by reference to appropriate hydrogen equipment standards and piping codes.

1.1 Applications

This Standard applies to the construction, performance, and installation procedures for a newly produced automatic damper device (referred to as “device” in this Standard) constructed entirely of new and unused parts and materials, and designed to be used with a gas-fired appliance listed by a nationally recognized certification body.

1.2 Inclusions

This Standard applies to the following automatic damper devices:

a)    vent;

b)   flue;

c)    fireplace chimney; and

d)   backflow prevention.

Flue damper devices have been in use for decades and have been tested and certified to this Standard by many nationally recognized certification bodies.

A backflow damper is designed to prevent flue gas from entering idle appliances when part of a positive pressure common vent system. These types of systems are becoming more commonly used in North America.

1.3 Gauge pressure

All references to “psi” throughout this Standard are to be considered gauge pressures unless otherwise specified.

1.4 Units of measurement

The values given in US customary units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

Note: See Annex F for conversion tables.

1.5 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.1 Inclusions

This Standard applies to fuel gas piping systems using corrugated stainless steel tubing (CSST), intended for installation in residential, commercial, or industrial buildings, and including the following components as a minimum:

a) corrugated stainless steel tubing (CSST) piping systems not exceeding a size of 2 in (50.8 mm), based on the nominal inside diameter of the tubing;

b) fittings for connection to the CSST; and

c) striker plates (see Clause 3) to protect the installed CSST from puncture threats.

Other components of piping systems referenced by this Standard include gas manifolds, gas pressure regulators, manual gas valves, quick-disconnect devices, excess flow valves, and gas convenience outlets (see Clauses 4.3, 4.4, and 4.5) .

Note: If such additional components are required to complete the piping system installation, they are either provided as part of the piping system or specified in the manufacturer’s installation instructions [see Clause 4.7 n)].

1.2 Additional inclusions

This Standard also applies to the following:

a) CSST piping systems in which portions of the piping are exposed to the outdoors, as required, to make connections to outdoor gas meters or to outdoor gas appliances, which are attached to, mounted on, or located in close proximity to the building structure; and

b) CSST piping systems that are used in conjunction with other approved fuel gas piping materials.

1.3 Exclusions

This Standard does not apply to the following:

a) CSST, whether coated or uncoated, intended for direct burial underground. Tubing is installed underground only when encased inside either an approved conduit or as part of an approved engineered system and in accordance with local codes and the manufacturer’s instructions; and

b) gas connectors for appliances. These connectors are covered by CSA/ANSI Z21.24 • CSA 6.10 and ANSI Z21.69 • CSA 6.16.

1.4 Concealment of tube fittings

This Standard includes criteria to establish the suitability of concealed mechanical tube fittings for use with concealed gas piping (see Clause 3).

1.5 System pressure ratings

This Standard applies to piping systems rated at

a) 5 psi (34.5 kPa) and intended for exposure to maximum actual operating pressures (see Clause 3) not exceeding 6.5 psi (44.8 kPa); or

b) 25 psi (172.5 kPa) and intended for exposure to maximum actual operating pressures not exceeding 30 psi (207 kPa).

Note: The manufacturer has the option to certify its system to either pressure rating.

1.6 Applicable fuels

This Standard applies to piping systems intended for use only with fuel gas as defined in Clause 3, but does not apply to piping systems intended for use with propane in the liquid state.

1.7 Pressure references

All references to psi throughout this Standard are to be considered gauge pressure unless otherwise specified.

1.8 Measurement units

If a value for measurement as given in this Standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.

Note: This Standard contains SI (metric) units corresponding to the yard/pound quantities, the purpose being to allow this Standard to be used in SI (metric) units. IEEE/ASTM SI 10 or ISO 80000-1 is used as a guide in making metric conversion from yard/pound quantities. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both, are to be provided. Given corresponding values might be approximate. See also Annex D.

1.9 Terminology

In this Standard, “shall” Is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.1 Inclusions

This Code applies to the design, location, construction, operation, operator training, and maintenance of

a) CNG vehicle refuelling stations; and

b) CNG bulk transport filling and decanting stations, including

i)     those that are fixed or mobile and intended for private or public dispensing operations; and

ii)    bulk transport filling and decanting stations that feed CNG pressure reduction stations or other non-vehicle uses.

1.2 Exclusions

This Code does not apply to

a)    refuelling vehicles with liquefied natural gas (LNG), which is covered by CSA B108.2. However, when an LNG facility has capacity for CNG vehicle refuelling from a liquid to compressed natural gas system (L/CNG system), this Code applies to facilities downstream of the L/CNG system odourizer’s outlet isolation valve;

b)    transfer of CNG from the CNG vehicle fuel storage system of one vehicle to the CNG vehicle fuel storage system of another vehicle;

c)    certified refuelling appliances (RFAs), except where

i)     the total flow capacity of a single refuelling appliance (RA), or multiple refuelling appliances is greater than 0.850 Sm3/min (30 SCFM); or

ii)    the RA is connected to piping tubing or storage. In this case, this Code applies to the piping, storage and dispensing system, starting at the outlet of the individual RA (see Figure D.1); and

d)    mobile equipment containing compressed natural gas in accordance with Transport Canada’s Transportation of Dangerous Goods Act and Regulations.

1.3 Pressure terminology

Unless otherwise specified, all references to pressure throughout this Code are to be considered gauge pressures.

1.4 Terminology

In this Code, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Code.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.5 Use of SI units

The values given in SI units are the units of record for the purposes of this Code. The values given in parentheses are for information and comparison only.

Notes:

1)    IEEE/ASTM SI 10 or ISO 80000-1 can be used as a guide when converting U.S. customary units to SI units.

2)    Where the abbreviation “gal” is used in this Code, it indicates a U.S. gallon equivalent to 3.785 L water capacity.

3)    This Code was originally developed using the U.S. customary system of measurement and subsequently converted to SI units having three significant digits. Every attempt has been made to provide accurate conversion values; however, when designing systems using these values, engineering judgment should be applied.

1.1 Inclusions

This Code applies to

a)   the design, location, construction, operation, operator training, and maintenance of LNG refuelling stations;

b)   LNG mobile refuelling units (MRUL) or LNG portable refuelling units (PRUL) with single containment storage tanks up to 265 m3 (70 000 gal) water capacity employed for vehicle LNG dispensing operations;

c)   shop-fabricated and assembled refuelling stations when used to receive and store LNG to dispense LNG into vehicle fuel tanks; and

d)   the LNG portion of stations that vapourize and pressurize LNG to obtain CNG, up to and including the odourizer’s outlet isolation valve.

Note: When a refuelling station dispenses fuels in addition to LNG, this Code applies only to the LNG refuelling system and equipment.

1.2 Exclusions

This Code does not apply to

a)   indoor refuelling;

b)   marine vessel LNG fuelling facilities;

c)   rail locomotive LNG fuelling facilities;

d)   equipment, piping, or tubing downstream of the L/CNG system odourizer’s outlet isolation valve (see CSA B108.1);

e)   CNG equipment including storage, compression, and/or dispensing equipment;

f)    CNG mobile refuelling units (MRUG) or CNG portable refuelling units (PRUG);

g)   equipment, piping, or tubing downstream of the gas pressure regulator for closed boil-off gas systems;

h)   dispensing of LNG other than into vehicle or cargo fuel tanks;

i)     liquefaction equipment;

j)     LNG engine fuel systems;

k)   LNG and CNG repair garages;

l)     underground piping or tubing for LNG;

m)  LNG storage tanks, pumps, and process piping or tubing when an LNG refuelling station is sharing the LNG plant storage tank; and

n)   transfer of LNG from the LNG vehicle fuel storage system of one vehicle to the LNG vehicle fuel storage system of another vehicle.

Note: This does not apply to a bulk fuel storage system.

1.3 Pressure terminology

Unless otherwise specified, all references to pressure throughout this Code are to be considered gauge pressures.

1.4 Terminology

In this Code, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Code.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.5 Units of measurement

The values given in SI units are the units of record for the purposes of this Code. The values given in parentheses are for information and comparison only.

Notes:

1)   IEEE/ASTM SI 10 or ISO 80000-1 can be used as a guide when converting U.S. customary units to SI units.

2)   Where the abbreviation “gal” is used in this Code, it indicates a U.S. gallon equivalent to 3.785 L water capacity.

3)   This Code was developed originally using the U.S. customary system of measurement and subsequently converted to SI units having three significant digits. Every attempt has been made to provide accurate conversion values; however, when designing systems using these values, engineering judgment should be applied.

1.1  Purpose

This Standard establishes requirements for pressure-retaining systems, components, and their supports over the service life of a CANDU NPP. The requirements of this Standard address

construction activities; and

in-service inspection, modification, repair, and replacement activities.

1.2  Applicability to pressure-retaining systems

This Standard applies to all pressure-retaining systems, including their components and supports, in a CANDU NPP.

1.3  Applicability to containment components

This Standard applies to containment components, but does not apply to containment structures which are covered in the CSA N287 Series of Standards.

1.4  Exclusion of portable assemblies

This Standard does not apply to portable assemblies of pressurized items that are temporarily connected to a system or component to enable testing, venting, draining, calibration, or other maintenance activities, provided that they

do not reduce the ability of a system to perform its design safety function;

are under surveillance when connected and are removed upon completion of their function; and

are constructed to Standards deemed by the licensee to be suitable for the application.

Note: Safety analysis, environmental qualification programs, or seismic qualification may be used to satisfy the conditions in this Clause.

1.5  Exclusion of sensing elements

This standard does not apply to sensing elements of instruments, except when the sensing element is included in the design of a component pressure boundary.

1.6  Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.

1.7  Units of measurement

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. The units in this Standard may be converted in accordance with the ASME BPVC, Section III, NCA-1150.

1.1  Objet

La présente norme définit les exigences en matière de systèmes et de composants sous pression ainsi que leurs supports pendant la durée en service dans une centrale nucléaire CANDU. Les exigences de la présente norme traitent de ce qui suit :

les activités de construction; et

les activités d’inspection en service, de modification, de réparation et de remplacement.

1.2  Applicabilité aux systèmes sous pression

Cette norme s'applique à tous les systèmes sous pression, y compris leurs composants et supports d'une centrale nucléaire CANDU.

1.3  Applicabilité aux composants de confinement

La présente norme vise les composants de confinement, mais non les enceintes de confinement qui sont elles-mêmes visées par la série de normes CSA N287.

1.4  Exclusion des ensembles portatifs

La présente norme ne s'applique pas aux ensembles portatifs constitués d'articles sous pression accouplés temporairement à un système ou composant afin de permettre la mise à l'essai, l'évacuation, la vidange, l'étalonnage ou autre activité d'entretien, dans la mesure où :

ils ne réduisent pas la capacité d'un système à remplir sa fonction de sûreté de conception;

ils sont surveillés pendant qu'ils sont accouplés et ils sont retirés une fois la tâche accomplie; et

ils sont construits selon des normes jugées acceptables par le titulaire de permis en regard de l'application visée.

Note : Des analyses de sûreté, des programmes de qualification en environnement ou la qualification sismique peuvent être utilisés pour satisfaire à cet article.

1.5  Exclusion des éléments de détection

Cette norme ne s’applique pas aux éléments de détection des instruments, sauf lorsque l’élément de détection est inclus dans la conception de l’enveloppe sous pression d’un composant.

1.6  Terminologie

Dans la présente norme, le terme « doit » indique une exigence, c.-à-d. une prescription que l’utilisateur est obligé de respecter pour assurer la conformité à la présente norme; « devrait » indique une recommandation ou ce qu’il est conseillé, mais non obligatoire; et « peut » indique une option ou ce qui est permis compte tenu des limites de la présente norme.

Les notes qui accompagnent les articles ne comprennent pas d'exigences ni d'exigences alternatives; le but d'une note accompagnant un article est de séparer du texte les éléments explicatifs ou informatifs.

Les notes au bas des tableaux et des figures font partie du tableau ou de la figure et peuvent être rédigées comme des exigences.

Les annexes sont qualifiées de normatives (obligatoires) ou d'informatives (facultatives) pour en préciser l'application.

1.7  Unités de mesure

Les valeurs indiquées en unités SI sont les valeurs officielles dans la présente norme. Les valeurs entre parenthèses sont données à titre d’information et pour fin de comparaison seulement. Les unités dans cette norme peuvent être converties conformément à la section III du BPVC de l'ASME, NCA-1150.

1.1
This Standard specifies the mechanical, electrical, and performance control requirements for integrated hydrogen fueling station (HFS) equipment (HFS modules) which transfer hydrogen from a source to vehicles with hydrogen fuel storage systems.

This Standard includes requirements for light, medium and heavy-duty vehicle fueling, including vehicles with H35, H70, LH2 and CcH2 fuel storage systems. 

Note: This Standard includes an informative annex A that provides methods to evaluate the hourly and daily capacity of an installed HFS.

1.2 
Unless otherwise stated, the standard conditions are as follows: temperature 15 °C and pressure 101 kPa.

1.3 
In case of conflict between this Standard and federal, provincial, state, or local regulations, governmental regulations take precedence.

1.4 
All references to pressure throughout this Standard are to be considered gauge pressure unless otherwise specified.

1.5 
In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text or explanatory informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.6 
The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only

1.1 General

1.1.1 Requirements for nuclear power plants and nuclear facilities

This Standard describes the requirements for seismic instrumentation systems for nuclear power plants and nuclear facilities to monitor site-specific seismic responses. These plants and facilities include

a) existing nuclear power plants and on-site nuclear facilities (e.g., spent fuel bays, dry fuel storage) (see Clause 4);

Note: “On-site” generally means within the protected area.

b) new nuclear power plants and on-site nuclear facilities (e.g., spent fuel bays, dry fuel storage) (see Clause 5);

c) new small reactors and on-site nuclear facilities (see Clause 6);

d) new enriched fuel processing, fabrication, and storage facilities (see Clause 7); and

e) new high- and intermediate-level radioactive waste storage facilities not in proximity to a nuclear power plant (see Clause 7).

Notes:

1) “Existing nuclear power plants and on-site nuclear facilities” refers to those licensed for operation prior to the publication date of this Standard. (see Clause 4.1.1).

2) The requirements for new builds and existing plants might differ. Where requirements differ for new builds and existing plants, the difference is explicitly stated.

3) “In proximity to” generally means either within the protected area or so close that the authority having jurisdiction (AHJ) judges that the instrumentation requirement in this Standard is satisfied by the instrumentation existing at the nuclear power plant.

1.1.2 Application for other nuclear facilities

This Standard is not required for, but may provide guidance to, other nuclear facilities that are under the jurisdiction of the Nuclear Safety and Control Act, . such as Examples of such other facilities include, but are not limited to:,

a) existing small reactors;

b) existing high- and intermediate-level radioactive waste storage facilities not associated with a nuclear power plant;

c) nuclear substance processing facilities;

d) low-level radioactive waste storage and disposal facilities; and

e) hospitals or nuclear research centres.

The operators of the such facilities listed in Items a) through e) may, together with the AHJ, determine the applicability and suitability of the guidance provided by this Standard.

1.1.3 Scope exclusions

1.1.3.1 Seismic trigger units

Seismic trigger units (e.g., gas shut-off valves) are not considered in this Standard but can be used for specialized engineering applications.

Note: Trigger units are not part of a seismic instrumentation system.

1.1.3.2 Automatic shutdown

Automatic shutdown is not a seismic design requirement of this Standard; however, sufficient instrumentation of high reliability, as specified in this Standard, is needed to collect data in order to facilitate decision-making regarding continued safe operation, and the data could also be used in conjunction with other indicators to inform earthquake response and recoverytrip a reactor. Refer to Annex A.

1.2 Purpose

Where required to be installed, the purpose of seismic instrumentation is to

a) measure the seismic response of the nuclear power plant or nuclear facility to the seismic ground motion;

b) provide seismic motion parameters that can be used to determine whether the seismic design basis has been exceeded;

c) generate seismic motion parameters that can be used in conjunction with inspections and testing of SSCs to determine whether the facility can continue operating; and

d) provide input for validation of the dynamic analysis, as defined in CSA N289.3, of SSCs.

Notes:

1) Nuclear power plant post-seismic response procedures (see Clause 6.5 of CSA N289.1) detail the inspections and testing requirements for safe shutdown, maintenance of fuel cooling, containment integrity, and monitoring.

2) Annex A outlines criteria for seismic design basis exceedeance of facility SSCs.

1.3 Terminology

In CSA standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the sStandard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the sStandard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.

1.1 Généralités

1.1.1 Exigences relatives aux centrales nucléaires et aux installations nucléaires

Cette norme précise les exigences relatives aux systèmes d’instrumentation sismique utilisés dans les centrales et les installations nucléaires pour la surveillance des réponses sismiques spécifiques au site. Ces centrales et installations comprennent notamment :

les centrales nucléaires et les installations nucléaires sur place (p. ex., piscines de désactivation, stockage de combustible sec) existantes (voir le chapitre 4);

Note : «Sur place» fait normalement référence à la partie intérieure de l’aire protégée.

les nouvelles centrales nucléaires et installations nucléaires sur place (p. ex., piscines de désactivation, stockage de combustible sec) (voir le chapitre 5);

les nouvelles petites centrales nucléaires et installations nucléaires sur place (voir le chapitre 6);

les nouvelles installations de traitement, de fabrication et de stockage de combustible enrichi (voir le chapitre 7); et

les nouvelles installations de stockage de déchets de haute et de moyenne activité non situées à proximité d’une centrale nucléaire (voir le chapitre 7).

Notes :

Les « centrales nucléaires et installations nucléaires existantes sur place » font référence à celles qui détenaient déjà un permis d’exploitation à la date de publication de la présente norme. (voir l’article 4.1.1)

Les exigences peuvent différer pour les nouvelles centrales et pour les centrales existantes. Les différences, lorsqu’elles existent, sont explicitement mentionnées.

«À proximité» fait normalement référence à l’intérieur de l’aire protégée ou si proche de cette aire que l’autorité compétente (AC) considère que les exigences de cette norme concernant l’instrumentation sont satisfaites avec l’emploi de l’instrumentation existante de la centrale nucléaire.

1.1.2 Application à d’autres installations nucléaires

Bien que son application ne soit pas obligatoire dans ce cas, la présente norme peut servir de guide pour les installations nucléaires qui relèvent de la Loi sur la sûreté et la réglementation nucléaires.  Des exemples d’autres installations de ce type sont notamment :

les petits réacteurs nucléaires existants;

les installations de stockage de déchets de haute et de moyenne activité existantes non reliées à une centrale nucléaire;

les installations de traitement de substances nucléaires;

les installations de stockage et d’élimination des déchets de faible activité; et

les hôpitaux et centres de recherche sur le nucléaire. Les exploitants de ces installations peuvent, de concert avec les autorités compétentes (AC), déterminer l’applicabilité et la pertinence des lignes directrices de la présente norme.

1.1.3 Exclusions du domaine d’application

1.1.3.1 Équipements de déclenchement sismique

Les équipements de déclenchement sismique (p. ex., vannes d’arrêt de gaz) ne sont pas pris en compte dans cette norme mais peuvent être utilisés à des fins spécialisées.

Note : Les équipements de déclenchement sismique ne font pas partie des systèmes d’instrumentation sismique.

1.1.3.2 Système d’arrêt automatique

Les systèmes d’arrêt automatique ne font pas partie des exigences de conception parasismique de cette norme; néanmoins, il est nécessaire, comme le prévoit cette norme, de disposer d’une instrumentation suffisante et très fiable de cueillette des données pour faciliter la prise des décisions qui visent à assurer l’exploitation sûre continue. Par ailleurs, ces données pourraient aussi être utilisées avec d’autres indicateurs pour éclairer les mesures d’intervention et de rétablissement en cas de séisme. (voir l’annexe A).

1.2 Objet

Lorsqu’une instrumentation sismique est jugée nécessaire, elle a pour objet:

de mesurer la réponse à des mouvements sismiques du sol d’une centrale nucléaire ou d’une installation nucléaire;

de fournir des paramètres de mouvements sismiques qui peuvent être utilisés pour déterminer si la limite sismique théorique a été dépassée;

de fournir des paramètres de mouvements sismiques qui peuvent être utilisés, lors des inspections et des essais de SSC, pour déterminer si l’exploitation peut continuer; et

de fournir des données d’excitation pour valider les analyses dynamiques des SSC définies dans la CSA N289.3.

Notes :

Les procédures de réponse post-sismiques d’une centrale nucléaire (voir l’article 6.5 de la CSA N289.1) précisent les exigences détaillées relatives aux inspections et aux essais touchant l’arrêt sûr, le maintien du refroidissement du combustible, l’intégrité de l’enceinte de confinement et la surveillance.

L’annexe A indique les critères de dépassement des limites sismiques théoriques touchant les SSC d’installations nucléaires.

1.3 Terminologie

Dans cette norme, le terme «doit» indique une exigence, c’est-à-dire une prescription que l’utilisateur doit respecter pour assurer la conformité à la norme; «devrait» indique une recommandation ou ce qu’il est conseillé mais non obligatoire de faire; et «peut» indique une possibilité ou ce qu’il est permis de faire.

Les notes qui accompagnent les articles ne comprennent pas de prescriptions ni de recommandations. Elles servent à séparer du texte les explications ou les renseignements qui ne font pas proprement partie de la norme.

Les notes au bas des figures et des tableaux font partie de ceux-ci et peuvent être rédigées comme des prescriptions.

Les annexes sont qualifiées de normatives (obligatoires) ou d’informatives (facultatives) pour en préciser l’application.