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  • BSI
    PD IEC/TR 63039:2016 Probabilistic risk analysis of technological systems. Estimation of final event rate at a given initial state
    Edition: 2016
    $569.57
    / user per year

Description of PD IEC/TR 63039:2016 2016

This document provides guidance on probabilistic risk analysis (hereafter referred to as risk analysis) for the systems composed of electrotechnical items and is applicable (but not limited) to all electrotechnical industries where risk analyses are performed.

This document deals with the following topics from the perspective of risk analysis:

  • defining the essential terms and concepts;

  • specifying the types of events;

  • classifying the occurrences of events;

  • describing the usage of modified symbols and methods of graphical representation for ETA, FTA and Markov techniques for applying those modified techniques complementarily to the complex systems;

  • suggesting ways to handle the event frequency/rate of complex systems;

  • suggesting ways to estimate the event frequency/rate based on risk monitoring;

  • providing illustrative and practical examples.

The relationship between the events covered by this document and associated risks are described in Table 1. Risk is defined as the effect of uncertainty on objectives (see 3.1.1). The uncertainty is here assumed to be composed of two elements: the epistemic and aleatory. The epistemic is categorised into the known and unknown, and the effect of the aleatory is classified into the controlled and the uncontrolled, respectively. Therefore, the risk associated with the known event of which impact is controlled is the controlled risk, and the risk associated with the known event of which impact is not controlled is the uncontrolled risk. Favourable meta-risk is of an unknown event of which impact can be casually controlled even if this unknown event appears, and unfavourable meta-risk is of an unknown event of which impact cannot be controlled.

For example, the risks resulting from random hardware failures of electrotechnical items will be categorised into the controlled or uncontrolled risks, while the risks owing to software bugs could be classified into the favourable or unfavourable meta-risks. This document covers the controlled and uncontrolled risks resulting from the events that can be assumed to occur randomly and independently of time (see Clause 6, 9.1, 9.2, 9.5 and Clause B.3).

Table 1 – Events and associated risks

Epistemic
Known Unknown
Aleatory Controlled Controlled
Event risk		 Controlled
Meta-risk
Uncontrolled Uncontrolled
Event risk		 Uncontrolled
Meta-risk


Standard NumberPD IEC/TR 63039:2016
TitleProbabilistic risk analysis of technological systems. Estimation of final event rate at a given initial state
StatusDefinitive
Publication Date2016-07-05
Identical National Standard OfIEC TR 63039:2016
DescriptorsMathematical symbols, Maintainability, Terminology, Mathematics, Quality control, Reliability, Electrical engineering, Availability, Mathematical calculations, Quality assurance, Maintenance
ICS03.120.01 Quality in general, 03.120.30 Application of statistical methods
CommitteeDS/1
ISBN978 0 580 92982 3
PublisherBSI
Pages84

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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