This unit develops students' technical and statistical skills in risk and reliability and also covers the social and organisational contexts which are so important in ensuring that products and services are designed, constructed and operated safely and reliably. The unit is taught with all the engineering disciplines in one class to reinforce the need for cross-discipline collaboration in risk and safety management.
As part of these assessments, risk and reliability analysts are required to perform evaluations of human reliability in addition to the analyses of hardware systems which are the primary focus of a typical risk assessment. Increasing emphasis is being placed on a comprehensive assessment of the human role in system safety following the occurrence of major disasters in the petrochemical industry such as Piper Alpha and other industries like Chernobyl where human errors are seen as direct or indirect causes. A better estimate of human reliability would help to design more effective safety systems and evaluate more accurate risk assessments. Human reliability is the probability that a person correctly performs system-required activities in a required time period (if time is a limiting factor) [2] . Human reliability is related to the field of human factors engineering and involves the study of human Performance Shaping Factors (PSF) [3] The safety of offshore installations often requires claims on human action. Where safety of substantial human actions and administrative controls are required and their need is justified, the feasibility and reliability of the actions are demonstrated qualitatively using task analysis. This qualitative modelling is used to substantiate any human-based safety claims and the quantitative modelling of the probability of the associated human errors. It is necessary to carry out task decomposition and analysis of sufficient depth in order to understand what is being assessed, the demands and influencing factors on personnel and to assist with the identification of reasonably practicable design options or improvements to support human reliability. Task analysis provides the necessary support to the HRA process for this demonstration of adequacy. The first part of the paper will discuss the implications of qualitative analysis for quantitative risk assessment. A network of Functional Resonance Analysis Method (FRAM) [4] is conducted to represent a qualitative risk assessment which consists of task analysis as function definitions.
Reliability Engineering And Risk Analysis: A Practical Guide, Third Edition
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