The objective of this work is to determine and study, analyze and elaborate, classify and categorize the main risk analysis and risk-assessment methods and techniques by reviewing the scientific literature. The paper consists of two parts: a) the investigation, presentation and elaboration of the main risk-assessment methodologies and b) the statistical analysis, classification, and comparative study of the corresponding scientific papers published by six representative scientific journals of Elsevier B.V. covering the decade 2000–2009. The scientific literature reviewing showed that the risk analysis and assessment techniques are classified into three main categories: (a) the qualitative, (b) the quantitative, and (c) the hybrid techniques (qualitative–quantitative, semi-quantitative). The qualitative techniques are based both on analytical estimation processes, and on the safety managers–engineers ability. According to quantitative techniques, the risk can be considered as a quantity, which can be estimated and expressed by a mathematical relation, under the help of real accidents’ data recorded in a work site. The hybrid techniques, present a great complexity due to their ad hoc character that prevents a wide spreading. The statistical analysis shows that the quantitative methods present the highest relative frequency (65.63%) while the qualitative a lower one (27.68%). Furthermore the hybrid methods remain constantly at a very low level (6.70%) during the entire processing period.

http://risktr.com/dokumanlar/risk%20analysis%20and%20assessment%20methodologies%20in%20th%20work%20sites.pdf

Risk analysis and assessment methodologies in the work sites: On a review, classification and comparative study of the scientific literature of the period 2000–2009

All Access to FAILURE MODE AND EFFECTS ANALYSIS FMEA PDF. Free Download FAILURE MODE AND EFFECTS ANALYSIS FMEA PDF or Read FAILURE MODE AND EFFECTS ANALYSIS FMEA PDF on The Most Popular Online PDFLAB. Only Register an Account to DownloadFAILURE MODE AND EFFECTS ANALYSIS FMEA PDF. Online PDF Related to FAILURE MODE AND EFFECTS ANALYSIS FMEA . Get Access FAILURE MODE AND EFFECTS ANALYSIS FMEA PDF and Download FAILURE MODE AND EFFECTS ANALYSIS FMEA PDF for Free.

Failure Mode and Effects Analysis (FMEA)

In human reliability analysis (HRA), dependence analysis refers to assessing the influence of the failure of the operators to perform one task on the failure probabilities of subsequent tasks A commonly used approach is the technique for human error rate prediction (THERP) The assessment of the dependence level in THERP is a highly subjective judgment based on general rules for the influence of five main factors A frequently used alternative method extends the THERP model with decision trees Such trees should increase the repeatability of the assessments but they simplify the relationships among the factors and the dependence level Moreover, the basis for these simplifications and the resulting tree is difficult to trace The aim of this work is a method for dependence assessment in HRA that captures the rules used by experts to assess dependence levels and incorporates this knowledge into an algorithm and software tool to be used by HRA analysts A fuzzy expert system (FES) underlies the method The method and the associated expert elicitation process are demonstrated with a working model The expert rules are elicited systematically and converted into a traceable, explicit, and computable model Anchor situations are provided as guidance for the HRA analyst's judgment of the input factors The expert model and the FES-based dependence assessment method make the expert rules accessible to the analyst in a usable and repeatable way, with an explicit and traceable basis

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Using Expert Models in Human Reliability Analysis - A Dependence Assessment Method Based on Fuzzy Logic

The human reliability analysis (HRA) was investigated intensively in the last decades and many methods have been developed. The most important feature of HRA is a good data, which can be obtained from full scope plant simulators. The objective of this study is to investigate how importance factors of human failure events obtained from results of probabilistic safety assessment (PSA) can be used in sense to improve human reliability. The study considers recently developed method: Institute Jožef Stefan (IJS)-HRA, which integrates some features of existing methods and some new features, and its application in a large PSA model. Two ways for quantification and application of importance factors are presented. The results show that only few human failure events dominate in the HRA analysis. The results show that only few parameters from human reliability database contribute significantly to the risk. Identification of dominating human failure events and identification of the significant parameters are a valuable input for determining the priorities of simulator training.

Importance of human contribution within the human reliability analysis (IJS-HRA)

Human reliability analysis (HRA) contributes to assessment and to reduction of the impact of human operators to the risk of technologies and processes. The objective of this paper is to integrate realistic deterministic safety analysis and probabilistic safety assessment to show how deterministic safety analysis impacts the HRA, which is integrated into the probabilistic safety assessment. The RELAP5/MOD3.3 computer code is used for realistic safety analysis. Parametric safety analysis studies give time parameters for human actions as an input for selected HRA. Calculated human error probabilities are inserted into probabilistic safety assessment and the results are obtained, where the focus goes to the most important risk contributors. The method and the results are shown on selected HRA method through two selected representative human actions. Results show that realistic safety analysis represents an important standpoint for assessment of human error probabilities within HRA.

Success criteria time windows of operator actions using RELAP5/MOD3.3 within human reliability analysis

Proposal for a sustainable framework process for the generation, validation, and application of human reliability assessment within the engineering design lifecycle

Assuring the safety of workers and passengers is a primary concern that has to be addressed in transport systems such as Heavy Rail. Introduction of new technologies into existing operation...

Enhancement of FMEA risk assessment with SysML

Rail organizations are very complex systems involving both the physical aspects of the rail system and the human aspects of the operating organization. Introduction of new technologies to the physical system affects the human aspects, so rail managers are concerned with maintaining the integrity across the whole system as it evolves. This paper describes a modelling framework based on the ISO42010 standard which allows for generating consistent models that help with overcoming the challenges raised by interconnectivity of the physical system and organization components. The foundation of the framework is a metamodel (an abstract model of the whole domain) which can be instantiated to various real organizations. The interconnected elements of the metamodel holds the relationships between the model elements which are mapped to the domain elements, so the interconnectivity among the rail system components and the human related requirements can be traced and maintained.

Developing a Modelling Framework for Aligning the Human Aspects to the Physical System in Large Complex Systems

An enterprise system consists of a number of components or building blocks. It is common to use views or models of the enterprise that contain a selection of these components (dependent on the intended usage of the model). The premise is that if these views are considered systems in their own right then the total enterprise system is actually a system-of-systems. Difficulty arises however when the boundaries between the systems overlap - it is therefore necessary to have an integrated model of the total enterprise that can cope with these overlaps and hence interactions between the systems. Within this paper there will be two main areas of work described; firstly the development of models/tools of “soft” enterprise characteristics; and secondly how these characteristics may be included in an integrated model of an enterprise system. Case studies of UK organisations (primarily within the defence industry) were undertaken to provide context to the results.

/pdf/8-1-3-towards-an-integrated-model-of-enterprise-systems-4vx5lnf9fk.pdf

Grace A Kennedy

Papers

Proposal for a sustainable framework process for the generation, validation, and application of human reliability assessment within the engineering design lifecycle

Enhancement of FMEA risk assessment with SysML

Developing a Modelling Framework for Aligning the Human Aspects to the Physical System in Large Complex Systems

8.1.3 Towards an Integrated Model of Enterprise Systems

Modeling the Evolution of Organizational Systems for the Digital Transformation of Heavy Rail