Status and needs on Human Reliability Assessment of complex systems

Pinto, J; Melo, Paulo Fernando Ferreira Frutuoso e; Saldanha, Pedro L. C.

doi:10.1201/b15938-93

Cited by 1 publication

(11 citation statements)

References 3 publications

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“…These elements are Process Nodes (PN), Condition Nodes (CN), Condition Edges (CO), Causality Edges (CE), Transfer Boxes (TB), and Transition Boxes (TT). More information is found in references [5,8,9,11,12,15].…”

Section: Dynamic Flowgraph Methodologymentioning

confidence: 99%

“…Besides, physical system components have a well-defined reliability approach. The same is not true in terms of software component [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…On digital systems, software promotes flexibility, cost reduction, and reliability through its high capacity of modification without the need of replacements. If one can complete debugs software, it will continue working indefinitely, and therefore, there is no possibility of aging [5].…”

Section: Introductionmentioning

confidence: 99%

“…There are dynamic interactions present in the systems that are not treated by the traditional approaches (fault trees methodology). In addition, there are existing requirements in reliability and safety analysis (e.g., the availability of relevant information to users (as cut sets and failure probabilities) and the possibility of incorporating the results into Probabilistic Safety Assessment (PSA)) that must be met in conjunction with the dynamic interactions [4,5,8].…”

Section: Introductionmentioning

confidence: 99%

“…The objective of this chapter is to present two different approaches for reliability analysis of digital I&C systems applying the methodologies cited above in different case studies [5,[9][10][11]. Consequently, these approaches are analyzed in terms of acceptability in the regulatory context.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Models for the Reliability Analysis of Digital Instrumentation and Control Systems for Nuclear Power Plants

Pinto¹,

Gomes²,

Saldanha³

et al. 2016

Automation and Control Trends

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The objective of this chapter is to discuss two approaches for reliability analysis of digital instrumentation and control systems in nuclear power plants taking into account the regulatory side. Dynamic Flowgraph Methodology (DFM) and Markov/Cell-to-Cell Mapping Technique (CCMT) are discussed and case studies developed are presented. These case studies involve simplified control systems for a steam generator and a pressurizer of a Pressurized Water Reactor (PWR) plant for the purpose of evaluating each method. Advantages and limitations of each approach are addressed. For the DFM approach, three concerns in the literature are addressed: modeling of the system itself, incorporation of the methodology results into existing Probabilistic Safety Assessments (PSA), and identification of software failures. The Markov/CCMT, which has been used in dynamic probabilistic safety assessments, is approached by means of a simplified digitally controlled water volume control system. The Markov/CCMT methodology results in detailed data of the system reliability behavior in relation to time. However, it demands a higher computational effort than usual as the complexity (i.e., number of components and failure states) of the system increases. As a regulatory research conclusion, the methodologies presented can be used on PSA risk informed assessment, contributing to the regulatory side.

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Section: Dynamic Flowgraph Methodologymentioning

confidence: 99%

“…Besides, physical system components have a well-defined reliability approach. The same is not true in terms of software component [5,6].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%