Application of hybrid renewable energy for supplying the emergency power supply system in case of station blackout in nuclear power plant

•Applications of renewable energy in contributing to the improvement of the electrical system of the nuclear power plant, specifically with regard to energy sources in case of emergency to ensure that there is no malfunction in the cooling systems after unplanned shutdown.•Designing the electrical system for nuclear power plants, the power supply systems shall be divided into four different levels of energy supply as follows: Class I, Class II, Class III and Class IV. In addition, it must include an emergency power supply system and be designated in most nuclear power plants so that the design complies with international standards and recommendations.•This hybrid energy system is used to feed the loads in the event of different scenarios such as startup, normal operation, planned shutdown and unplanned shutdown of the station and the interruption of traditional sources of the Egyptian first nuclear power plant at El-Dabaa site (1200MWe).•The HRES is designed to operate multiple sources with grid synchronization mode as well as islanded mode.•Transient stability analysis for sceneries of station blackout. This paper introduces the applications of renewable energy in contributing to the improvement of the electrical system of the nuclear power plant, specifically with regard to energy sources in case of emergency to ensure that there is no malfunction in the cooling systems after unplanned shutdown. The Fukushima accident had an impact on reassessing the design of the electrical systems of nuclear power plants to avoid partial or complete blackout of the nuclear power plants because of its effects on the environment and the population. We proposed a new design to add Wind/PV/Battery power system to the electrical emergency system to enhance the safety and reliability of the electrical emergency systems. This hybrid energy system is used to feed the loads in the event of different scenarios such as startup, normal operation, planned shutdown and unplanned shutdown of the station and the interruption of traditional sources of the Egyptian first nuclear power plant at El-Dabaa site (1200 MWe). The proposed Renewable energy systems are designed and analyzed using electrical transient and analysis program (ETAP), version 19.0.1, assuming different load flow audit scenarios. The study has proven the extent to which renewable energy can be used to ensure the safety functions and protect the nuclear power plant in the event of complete blackout.