The present invention relates to a simulation system for an engineered safety features-component control system (ESF-CCS) modeled with a web-based language, capable of providing an operator of a nuclear power plant with a process modeled with the web-based language for preventing emanation of a radioactive substance when the emanation is possible to occur due to a failure of the safety features such as an emergency core cooling means, a reactor containment vessel, a water spray means, and a purification means that are equipped in the nuclear power plant. The simulation system for the ESF-CCS modeled with the web-based language includes: an operation unit of an engineered safety feature; a modeling module of the engineered safety feature; a display; and a web server. Accordingly, the operator performs simulation training with respect to a failure occurrence of the engineered safety feature to cope calmly with a real situation which occurs, and the operator is able to study various ways to deal with the failure since the plant is not actually damaged by an accident generated during the simulation training. Also, high specification is not required due to use of the web-based language, and especially when associated with the web server, mobility is improved by applying the simulation system to a mobile terminal.
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