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BS EN IEC 61226:2021

BS EN IEC 61226:2021

$189.07

Nuclear power plants. Instrumentation, control and electrical power systems important to safety. Categorization of functions and classification of systems

Published By Publication Date Number of Pages
BSI 2021 46
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IEC 61226:2020 establishes, for nuclear power plants , a method of assignment of the functions specified for the plant into categories according to their importance to safety. Subsequent classification of the I&C and electrical power systems performing or supporting these functions, based on the assigned category, then determines relevant design criteria. The design criteria, when applied, ensure the achievement of each function in accordance to its importance to safety. In this document, the criteria are those of functionality, reliability, performance, environmental qualification (e.g. seismic) and quality assurance (QA). This edition includes the following significant technical changes with respect to the previous edition: – to align on IAEA requirements, recommendations and terminology, particularly to take into account the replacement of NS-R-1 by SSR 2/1 and publication of SSG 30; – to extend the scope to electrical power systems; – to move the detailed requirements applying to functions and I&C systems to a normative annex, which will be removed after updating IEC 61513.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
13 1 Scope
14 2 Normative references
Figure 1 – Overall classification scheme
15 3 Terms and definitions
21 4 Abbreviated terms
5 Categorization scheme
5.1 General
22 5.2 Background
5.3 Description of categories
5.3.1 General
24 5.3.2 Category A
5.3.3 Category B
5.3.4 Category C
5.4 Assignment criteria
5.4.1 General
25 5.4.2 Category A
5.4.3 Category B
5.4.4 Category C
26 6 Categorization/classification procedure
6.1 General
27 6.2 Identification of anticipated operational occurrences (AOO), design basis accidents (DBA) and design extension conditions (DEC)
Figure 2 – Method of categorization of functions and classification of I&C systems
28 6.3 Identification and categorization of functions
6.4 Classification of systems
6.4.1 Classification of I&C systems
29 Table 1 – Correlation between classes of systems and categories of functions
30 6.4.2 Classification of electrical power systems
7 Assignment of technical requirements to categories and classes
Figure 3 – Method of classification of electrical power systems
32 Table 2 – Tabular correlation between classes and other IEC standards
33 Annex A (normative) Assignment of technical requirements to I&C systems
A.1 General
A.2 Requirements related to functions
A.2.1 Basic requirements
A.2.2 Specific requirements
34 A.3 Requirements related to systems
A.3.1 Basic requirements
35 A.3.2 Specific requirements
37 A.4 Requirements related to equipment qualification
A.4.1 Basic requirements
A.4.2 Specific requirements
38 A.5 Requirements related to quality aspects
A.5.1 Basic requirements
39 A.5.2 Specific requirements
41 Annex B (informative) Examples of categories and classes
B.1 General
B.2 Category A/Class 1
B.2.1 Typical functions
B.2.2 Typical I&C systems
B.2.3 Typical electrical power systems
B.3 Category B/Class 2
B.3.1 Typical functions
42 B.3.2 Typical I&C systems
B.3.3 Typical electrical power systems
B.4 Category C/Class 3
B.4.1 Typical functions
B.4.2 Typical I&C and electrical power systems
44 Bibliography

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BS EN IEC 61226:2021
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