ABSTRACT
In past few years, serious accidents in chemical plants occurred frequently in Japan. Large-scale and complexity of chemical plants are growing. After the severe accident of Fukushima Daiichi nuclear power plants due to the Great East Japan Earthquake and Tsunami, the safety management of large industrial facilities has taken on increasing importance. Since then most Japanese people feel anxiety about not only nuclear engineering but also chemical engineering. In other words, our society required to build up a believable safety and reliability of chemical plants. As well-known many kinds of hazardous materials are under controlled in facilities. If a severe accident occurs, there is a possibility of a serious damage to employees and also local residents in the community. Therefore “risk assessment” is more important to identify the cause of the accident. Before an accident occurs, we should calculate the risk based on the frequency and scale of the damage of industrial facilities (Isshiki et al. 2013). This paper shows how to re-evaluate risks in chemical plants by considering reliability of existed safety guards system in plants.
