We show with simplified numerical models, that for the kind of RBMK operated in Chernobyl: The core was unstable due to its large size and weak power counter-reaction coefficient, so reactor not easy control even an automatic system. Xenon oscillations could easily be activated. When there xenon poisoning upper half core, safety rods were designed such a way that, at least initially, they incre...

in order to study the epidemiology of accidents in tehran city, the author has collected and analysed records of more than 25,000 accident cases for the period 1960-61 from all available sources such as newspaper rapportages,nine major hospitals of tehran, forensic medicine department of ministry of justice, vital statistics department of ministry of health, labors' insurance organization, etc....

• Derailments account for 70 % of the industry’s average annual accident cost. Machine learning identified factors that more strongly associate with derailments. Extreme gradient boosting outperformed 10 other types machine methods. Railroads are critical to economic health a nation. Unfortunately, railroads lose hundreds millions dollars from accidents each year. Trends reveal derailments cons...

We propose a framework using system dynamics to model the dynamic behaviour of organisations in accident analysis. Most current accident analysis techniques are event-based and do not adequately capture the dynamic complexity and non-linear interactions that characterize accidents in complex systems. In this paper we propose a set of system safety archetypes that model common safety culture fla...