The core of a nuclear power plant generates enormous amounts of heat. However, if the fluid entering and leaving the nuclear reactor is used to directly extract heat to produce electricity, the fluid that is to extract the heat will come into direct contact with the fuel. rods in the nuclear reactor, which will certainly release enormous nuclear radiation from the system. This will be absolutely prohibited. Therefore, helium, liquid metal, thermal oil or water are usually used to create a completely closed heat exchange cycle between the nuclear reactor and the heat exchanger. The heat exchanger is actually a “steam generator” used for electricity production. The steam generator is completely isolated from the fluid which must produce heat in the nuclear reactor. Such a design is “a necessary step for. isolate nuclear radiation." "It is an external meansvery important to isolate nuclear radiation." Although it has relatively reduced the total utilization rate of thermal energy, for safety reasons it must be "rejected."
The Ordinary thermal power plants do not present any radioactive risk problems and are not necessary. The use of gas circulation of course does not require an intermediate heat exchange process. The use of steam circulation alone can use more. heat energy directly and more efficiently.