A method for dynamic risk assessment of thermal hazards due to runaway reactions is described by means of a tutorial and implemented to study the thermal decomposition of an organic peroxide. The analysis is based on an adiabatic experiment, providing data that can closely predict large-scale behavior. The experimental equipment used allows online monitoring of the temperature and rate of temperature of the hazardous material subject to runaway reaction safety. The calculation of thermal risk index is dynamically performed, and the risk obtained is compared to a predefined risk scale. On the basis of the risk ranking, adequate preventative and protective measures can be implemented.