IEC TR 63039-2016 PDF

Full title and description

Probabilistic risk analysis of technological systems — Estimation of final event rate at a given initial state. This technical report provides guidance for probabilistic risk analysis of systems composed of electrotechnical items (and other technological systems), addressing terminology, event types and classification, adapted graphical representations for ETA/FTA and Markov techniques, approaches to estimate final-event frequencies/rates, use of risk monitoring, and illustrative examples for practical application.

Abstract

IEC TR 63039:2016 defines essential terms and concepts for probabilistic risk analysis (PRA) of technological and electrotechnical systems and gives recommended methods to estimate the frequency/rate of a final (undesirable) event starting from a specified initial state. The report covers event classification, modified symbols and graphical conventions for event tree analysis (ETA), fault tree analysis (FTA) and Markov techniques (and how to use them together), approaches to handle uncertainty and dependencies in complex systems, and examples showing application of the methods and risk-monitoring-based estimation.

General information

• Status: Published (Technical Report)
• Publication date: 5 July 2016
• Publisher: International Electrotechnical Commission (IEC)
• ICS / categories: 03.120.01, 03.120.30
• Edition / version: 1.0
• Number of pages: 79

Information above is taken from IEC publication metadata for IEC TR 63039:2016.

Scope

This technical report gives guidance on probabilistic risk analysis for systems composed of electrotechnical items and is applicable (but not limited) to all electrotechnical industries where PRA is performed. It defines the basic properties of events from a PRA viewpoint, specifies event types and classifications, describes modified symbols and graphical representation methods for ETA, FTA and Markov techniques so they can be applied complementarily to complex systems, suggests ways to estimate and handle event frequency/rate including uncertainty and dependencies, and presents ways to use risk monitoring data to update estimates. The report also includes illustrative and practical examples to show application of the recommended approaches.

Key topics and requirements

• Definitions and essential terminology for probabilistic risk analysis and dependability-related concepts.
• Classification and typology of events relevant to final (undesirable) outcomes.
• Modified symbols and graphical conventions for ETA, FTA and Markov models to support combined use in complex systems analysis.
• Methods to estimate the frequency/rate of a final event given a specified initial state, including treatment of uncertainty and dependencies.
• Approaches for using risk monitoring and operational data to update event-rate estimates.
• Worked examples demonstrating application of the techniques to practical electrotechnical systems.

Typical use and users

Engineers and analysts performing probabilistic risk assessments and dependability studies for electrotechnical and other technological systems; safety and reliability engineers; system designers and manufacturers who need to quantify frequencies of undesired final events; regulatory bodies and certification/assessment teams; researchers and academics working in reliability engineering and risk analysis. The report is intended as guidance to complement existing PRA/functional-safety standards and analytical practices.

Related standards

IEC TR 63039:2016 is used alongside other dependability, risk and safety standards and techniques such as IEC standards on fault-tree and event-tree techniques, functional safety and dependability management, and international risk-management guidance. Typical related references include standards covering FTA/ETA methodologies, functional safety (for example IEC 61508 family), dependability management and PRA techniques. National adoptions or equivalents (where applicable) may exist.

Keywords

probabilistic risk analysis, PRA, dependability, event rate estimation, event tree analysis (ETA), fault tree analysis (FTA), Markov techniques, event classification, risk monitoring, electrotechnical systems

FAQ

Q: What is this standard?

A: IEC TR 63039:2016 is a Technical Report providing guidance on probabilistic risk analysis of technological (especially electrotechnical) systems, focusing on methods to estimate the rate or frequency of a final undesirable event from a given initial state.

Q: What does it cover?

A: It covers terminology and definitions, event types and classification, modified graphical symbols and methods for ETA/FTA/Markov techniques (and their complementary use), approaches to estimate final-event frequencies including handling uncertainties and dependencies, use of risk-monitoring data, and illustrative examples.

Q: Who typically uses it?

A: Reliability and safety engineers, risk analysts, system designers, manufacturers of electrotechnical equipment, regulators, certification bodies, and researchers engaged in probabilistic risk assessments and dependability analysis.

Q: Is it current or superseded?

A: IEC TR 63039 was published on 5 July 2016 as edition 1.0. As of the publication metadata, it is a valid Technical Report; users should check national catalogues or IEC updates for any later revisions or related documents before relying on it for regulatory compliance.

Q: Is it part of a series?

A: It is part of the IEC’s dependability/risk analysis work (developed under TC 56 Dependability) and is related to other IEC documents addressing analysis techniques and dependability management; it complements standards and technical reports addressing FTA/ETA methodologies and functional safety.

Q: What are the key keywords?

A: Probabilistic risk analysis, event frequency/rate estimation, event classification, ETA, FTA, Markov, dependability, risk monitoring, electrotechnical systems.