Abstract
Investigation reveals that a high percentage of incident causes are ascribed to some forms of human error. To effectively prevent incidents from happening, Human Reliability Analysis (HRA), as a structured way to represent unintentional operator contribution to system reliability, is a critical issue. Human Error Reduction and Assessment Technique (HEART) as a famous HRA technique, provides a straightforward method to estimate probabilities of human error based on the analysis of tasks. However, it faces varying levels of uncertainty in assigning of weights to each error producing condition (EPC), denoted as assessed proportion of affect (APOA), by experts. To overcome this limitation and consider the confidence level (reliability or credibility) of the experts, the current study aimed at proposing a composite HEART methodology for human error probability (HEP) assessment, which integrates HEART and Z-numbers short for, Z-HEART. The applicability and effectiveness of the Z-HEART has been illustrated in the de-energization power line as a case study. Furthermore, a sensitivity analysis is fulfilled to investigate the validity of the proposed methodology. It can be concluded that Z-HEART is feasible for assessing human error, and despite the methodological contributions, it offers many advantages for electricity distribution companies.
Highlights
People of each successful company are definitely its most important assets
The results of the implementation of the Z-HEART and Fuzzy HEART for de-energization power line are presented in Table 6.and Fig 7
We proposed a hybrid human reliability analysis that merged conventional HEART technique with Z-numbers
Summary
People of each successful company are definitely its most important assets. Detailed investigations reveal that a high percentage of incident causes have been ascribed to some forms of this element error. With the rapid technological innovation, the percentage of operator error in system failure tends to become conspicuous compared to technical failure. The generic term of human error as a workable label for human functions whether done or not done, is unintended by the operational system concept and negatively contributes to risk. In order to effectively prevent accidents from happening, Human Reliability Analysis (HRA) is essential as a structured way to represent unintentional.
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