BS EN 61226:2010 - Nuclear power plants. Instrumentation and control important to safety. Classification of instrumentation and control functions – BSI British Standards

BS EN 61226:2010

Nuclear power plants. Instrumentation and control important to safety. Classification of instrumentation and control functions

Status : Current, Work in hand   Published : September 2009

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BS EN 61226:2010 Nuclear power plants. Instrumentation and control important to safety. Classification of instrumentation and control functions

BS EN 61226 is an International Standard which establishes a method of classification of the information and command functions for nuclear power plants, and the I&C systems and equipment that provide those functions, into categories that designate the importance to safety of the function. The resulting classification then determines relevant design criteria.

The design criteria are the measures of quality by which the adequacy of each function in relation to its importance to plant safety is ensured. In this standard, the criteria are those of functionality, reliability, performance, environmental durability (including seismic) and quality assurance (QA).

BS EN 61226 is applicable to all the information and command functions and the instrumentation and control (I&C) systems and equipment that provide those functions. The functions, systems and equipment under consideration provide automated protection, closed or open loop control and information to the operating staff. They keep the NPP conditions inside the safe operating envelope and provide automatic actions, or enable manual actions, that prevent or mitigate accidents, or that prevent or minimize radioactive releases to the site or wider environment. The I&C functions that fulfil these roles safeguard the health and safety of the NPP operators and the public.

BS EN 61226 follows the general principles given in IAEA safety code NS-R-1 and safety guide NS-G-1.3, and it defines a structured method of applying the guidance contained in those codes and standards to the I&C systems that perform functions important to safety in a NPP. This standard should be read in association with the IAEA guides and IEC 61513 in implementing the requirements of IEC 61508 series.

Contents of BS EN 61226:

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Classification scheme
5.1 General
5.2 Background
5.3 Description of categories
5.3.1 General
5.3.2 Category A
5.3.3 Category B
5.3.4 Category C
5.4 Assignment criteria
5.4.1 General
5.4.2 Category A
5.4.3 Category B
5.4.4 Category C
6 Classification procedure
6.1 General
6.2 Identification of design basis
6.3 Identification and classification of functions
7 Assignment of technical requirements to categories
7.1 General requirements
7.2 Requirements related to functions
7.2.1 Basic requirements
7.2.2 Specific requirements
7.3 Requirements related to I&C systems
7.3.1 Basic requirements
7.3.2 Specific requirements
7.4 Requirements related to equipment
7.4.1 Basic requirements
7.4.2 Specific requirements
7.5 Requirements related to quality aspects
7.5.1 Basic requirements
7.5.2 Specific requirements
Annex A (informative) Examples of categories
Bibliography
Figure 1 – Method of classification
Table 1 – Tabular correlation between categories and other IEC standards

 




Standard NumberBS EN 61226:2010
TitleNuclear power plants. Instrumentation and control important to safety. Classification of instrumentation and control functions
StatusCurrent, Work in hand
Publication Date30 September 2009
Normative References(Required to achieve compliance to this standard)IEC 60964, EN 62138, IAEA NS-G-1.3:2002, IEC 61772, IEC 60880:2006, IAEA NS-R-1:2000, IEC 60812, IEC 60709, EN 61000-4, IEC 60987, IEC 60965, IEC 61513:2001, IEC 61839, IEC 60780, IEC 62138, IEC 60980, EN 60987, IEC 61000-6-2, IEC 60671:2007, IAEA GS-R-3:2006, EN 60812, EN 60880:2009, EN 61000-6-2, EN 60964, IEC 61000-4, IEC 61771
Informative References(Provided for Information)IAEA Safety Glossary:2007, IEC/TR 61838, IEC 61508-1, IEC 60050-394, IEC 61508-4, IEC 61508-3, IEC 61508-2
ReplacesBS IEC 61226:2005
International RelationshipsEN 61226:2010,EN 61340-2-3:2016,IEC 61340-2-3:2016
Amended ByCorrigendum, June 2010
DescriptorsNuclear technology, Nuclear reactors, Measuring instruments, Electric power stations, Nuclear-electric power stations, Instruments, Control systems, Nuclear power, Nuclear safety, Classification systems
ICS17.220.99
27.120.20
29.020
Title in FrenchCentrales nucléaires de puissance. Instrumentation et contrôle-commande importants pour la sûreté. Classement des fonctions d'instrumentation et de contrôle-commande
Title in GermanKernkraftwerke. Leittechnische Systeme mit sicherheitstechnischer Bedeutung. Kategorisierung leittechnischer Funktionen
CommitteeNCE/8
ISBN978 0 580 70133 7
PublisherBSI
FormatA4
DeliveryYes
Pages38
File Size811 KB
Price£214.00


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