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IEC TR 63161:2022

(Main)

Assignment of a safety integrity requirements - Basic rationale

Assignment of a safety integrity requirements - Basic rationale

IEC TR 63161:2022 can be used where a risk assessment according to ISO 12100 has been conducted for a machine or process plant and where a safety related control function has been selected for implementation as a protective measure against specified hazards. This document describes an example basic logical rationale to assign a safety integrity requirement to the selected function.
The description is generic and as far as reasonably possible independent from any specific tool or method that can be used for assignment of a safety integrity requirement. The requirement can be expressed as a safety integrity level (SIL), or performance level (PL).
An example basic rationale is described that is embodied by such methods and tools, as far as they follow a risk based quantitative approach.
Conversely, the logic described in this document can be used as a reference for assessing specific methods or tools for safety integrity assignment. This can clarify how far the respective tool/method is following a risk based quantitative approach, and where deviations from that approach are imposed by other considerations. In real applications, the quantitative risk based approach can be modified or overridden by other considerations in many cases and for good reasons. It is not within the scope of this document to discuss or evaluate such reasons. Usually the reasons for deviations from a given tool or method from a quantitative logic are provided, so that this can be discussed in the proper frame.
Examples for such analyses are provided for common assignment tools in the format of risk graphs and risk matrices.
This document can be used for safety related control functions in all modes of application: continuous mode, high demand mode and low demand mode of application.

General Information

Status
Published
Publication Date
12-Jul-2022
ICS
13.110 - Safety of machinery
Technical Committee
TC 44 - Safety of machinery - Electrotechnical aspects
Drafting Committee
PT 63161 - TC 44/PT 63161
Current Stage
PPUB - Publication issued
Start Date
01-Aug-2022
Completion Date
13-Jul-2022
Ref Project

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IEC TR 63161
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Assignment of safety integrity requirements – Basic rationale

IEC TR 63161:2022-07(en)

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IEC TR 63161

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REPORT








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Assignment of safety integrity requirements – Basic rationale




























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– 2 – IEC TR 63161:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Risk based quantitative approach . 10
4.1 General . 10
4.2 Sequence of steps in functional safety assignment . 10
4.3 Reference information . 12
4.3.1 General . 12
4.3.2 Accident scenario . 13
4.3.3 Hazard zone . 13
4.3.4 Severity of harm . 13
4.3.5 Safety control function .
...

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