HKNIC - Basic Features

Basic Features
Practically all electricity is produced by rotating machinery called generators. They can be turned by wind, water or most commonly by high pressure steam produced from boiling water. A nuclear power station provides the heat to turn water into steam through a process called nuclear fission. Each generating unit at Daya Bay consists of a "nuclear island" (left picture (1)) where the steam is produced and a "conventional island" (left picture (2)) where the steam is used to produce electricity. These two generating units are supported by various other station facilities (left picture (3)).

In the nuclear island, heat is produced by the nuclear reaction in the pressurised water reactor and delivered as water to the interface with the conventional island, where it is turned into steam.

In the conventional island, steam at high pressure passes through a multi-stage turbine which is coupled to an electric generator. The steam leaving the turbine then passes through a condenser where the heat is removed, causing it to condense as water. This water is pumped back to the nuclear island to be turned again into steam.

At Daya Bay, cooling water for the condenser is taken from the sea. Water used in the nuclear island is physically separated from the water used in the conventional island, and is in turn separated from the water taken from the sea for the condenser. This physical separation provides a barrier to any escape of radioactivity into the environment.

See "
Nuclear Power Generation Principles" for more information.