Response to ‘Supplemental viewpoints on the use of importance measures in risk-informed regulatory applications’

Cheok, Michael C.; Parry, Gareth; Sherry, Richard R.

doi:10.1016/s0951-8320(97)00146-4

Cited by 12 publications

(2 citation statements)

References 2 publications

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“…Risk Achievement Worth (RAW) has been introduced by Cheok et al (1998aCheok et al ( , 1998b for risk analysis terminology. Risk Achievement Worth mainly used as a risk importance measure in probabilistic safety assessments of nuclear power stations.…”

Section: (B) Risk Achievement Worthmentioning

confidence: 99%

An Overview of Various Importance Measures of Reliability System

Amrutkar¹,

Kamalja²

2017

Int J Math, Eng, Manag Sci

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One of the purposes of system reliability analysis is to identify the weaknesses or the critical components in a system and to quantify the impact of component’s failures. Various importance measures are being introduced by many researchers since 1969. These component importance measures provide a numerical rank to determine which components are more important to system reliability improvement or more critical to system failure. In this paper, we overview various components importance measures and briefly discuss them with examples. We also discuss some other extended importance measures and review the developments in study of various importance measures with respect to some of the popular reliability systems.

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Section: (B) Risk Achievement Worthmentioning

confidence: 99%

An Overview of Various Importance Measures of Reliability System

Amrutkar¹,

Kamalja²

2017

Int J Math, Eng, Manag Sci

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“…Range: G-Green; Y-Yellow; and R-Red Although the concepts "risk significance" and "safety significance" are often conflated in risk-informed applications, FV importance is generally regarded as a measure of risk significance, while RAW is that of safety significance (Cheok et al, 1998a;Cheok et al 1998b;NRC, 2019). But they are evaluated based on an average PRA model over different configurations and diverse accident sequences (Vesely, 1998).…”

Section: Time-dependent Criteria Of Systems Structures and Componenmentioning

confidence: 99%

Research on Time-Dependent Component Importance Measures Considering State Duration and Common Cause Failure

Zhang

et al. 2020

Front. Energy Res.

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Unlike the current risk monitors, Real-time Online Risk Monitoring and Management Technology is characterized by time-dependent modeling on the state duration of components. Given the real-time plant configuration, it eventually provides the time-dependent risk level and importance measures for operation and maintenance management. This paper focuses on the assessment method of time-dependent importance measures and its risk-informed applications in real-time online risk monitoring and management technology, including Fussell-Vesely (FV), risk achievement worth (RAW), and risk reduction worth (RRW). In this study, the values of component importance have been investigated with a time-dependent risk quantification model, as well as the common cause failure treatment model. Here three options of common cause failure treatment have been developed, assuming that the unavailability of a component could be due to an independent factor (Option 1), a common cause factor (Option 2), or an unconfirmed cause (Option 3). In the special case of “what if a component is out-of-service” of the RAW numerator, a hybrid method for the RAW evaluation is presented resulting in a balanced and reasonable RAW value. A simple case study was demonstrated. The results showed that the absolute values and ranking order of time-dependent importance not only reflected the effect of the cumulative state duration of component on risk, but also comprehensively accounted for all possible situations of component unavailability. Moreover, time-dependent importance measures improved and provided novel insights for online configuration management, 1) ranking SSCs/events/human actions for controlling increased risk and optimizing near–term plans; and 2) exempting or limiting temporary configurations during online operation.

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2012

Importance Measures in Reliability, Risk, and Optimization

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Response to ‘Supplemental viewpoints on the use of importance measures in risk-informed regulatory applications’

Cited by 12 publications

References 2 publications

An Overview of Various Importance Measures of Reliability System

An Overview of Various Importance Measures of Reliability System

Research on Time-Dependent Component Importance Measures Considering State Duration and Common Cause Failure

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