Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
1999, Volume 2, Issue 3+4

The Role of Human Performance in the Safety Complex Plants' Operation

Abstract

According to statistics, about 20-30% from the failures occurred in the plants itre caused directly or indirectly by human errors. Furthermore, it was established that 10-15  percents of the global failures are related with the human errors. These are mainly due to the wrong actions, maintenance errors, and misinterpretation of instuments. The human performance is influenced by: professional ability, complexity and danger of the plant, experience in the same work place, level of skills, events in personal and/or professional life, discipline, social ambience, somatic health. The human performances' assessment in the probabilistic safety assessment offers the possibility of evaluation for human contribution to the events sequences outcome. A human error may be recovered before the unwanted consequences had been occurred on systern. This paper presents the possibilities to use the probabilistic methods (event tree, fault tree) to identify the solutions for human reliability improvement in order to minimise the risk in industrial plants' operation. Also, are defined the human error types and their causes and it is presented the "decision tree method" as technique in our analyses for human reliability assessment. The exeinpliflcation of human error analysis method was achieved based on operation data for Valcea heavy water pilot plant.