الفهرس 
Interface and interconnecting nuclear power plants with electric grid
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Abstract
Nuclear power plants (NPPs) are one of the important sources to generate electricity, it can contribute in raising the efficiency of the electric power system and contribute in reducing the proportion of carbon dioxide in nature. Nuclear power plants are similar to traditional stations that use fossil fuels, as they include (steam turbine - generator - electrical transformers - various cooling methods, whether cooling towers or using sea water), but the source of thermal energy production in nuclear plants is the nuclear reactor instead of the combustion chamber in conventional stations.The nuclear reactor produces the necessary thermal energy to generate steam, which is compressed at a specific degree, which rotates the turbine, and connects with the electric generator.The electric generator which produces the necessary electrical energy. However, it is necessary for the establishment and operation of NPPs to follow all the nuclear safety procedures, which are set by international organizations and regulatory bodies working in this field, in order to ensure a safe operation for the nuclear reactor. Also, in emergency situations, that lead to the shutdown of the nuclear reactor, it continues to produce thermal energy for a period of time after shut down, and produces about 6.5% of the thermal energy before shutting down, this energy gradually decreases and reaches 1.5% after one hour from Shutting down the nuclear reactor and up to 0.2% after a day from shutting down the nuclear reactor. Therefore, the cooling systems in the reactor are considered one of the most important means to achieve nuclear safety, which cool down the core of the nuclear reactor and protect it from melting