The process of steam generation in a gas-cooled nuclear reactor

The provided diagram illustrates the operational mechanism of a gas-cooled nuclear reactor, detailing how nuclear energy is converted into steam for electricity production. The system functions as a continuous cycle involving the reactor core, a heat exchanger, and various circulation components.

At the heart of the process is the reactor, which is encased in concrete radiation shielding and a pressure vessel. Inside, uranium fuel elements are positioned alongside graphite moderators and boron control rods, which manage the nuclear reaction. As the fuel elements generate heat, a gas blower forces gas through the reactor core. This gas absorbs the thermal energy and is subsequently transported via a hot gas duct to the heat exchanger.

Within the heat exchanger, the hot gas flows through a coiled pipe system, transferring its heat to incoming water. This interaction causes the water to vaporise into steam, which is then directed towards a turbo-alternator. Meanwhile, the gas, having lost its heat, is cooled and recirculated back into the reactor by the gas blower. The entire system is supported by charge tubes for loading fuel elements, ensuring the reactor remains functional for sustained energy production.