NUCLEAR REACTOR

Description:

It is a device in which nuclear fission chain reaction takes place at a constant rate in a controlled manner. It is  used to produce nuclear energy for industrial and other useful purposes.
principle:
Controlled Fission chain Reaction is the principle of a nuclear reactor.

Explanation:

 The role of reactor in a nuclear power station is the same as that of a furnace in a thermal power station.  Heat energy  is produced in Fission reaction. This energy is used to rotate a turbine. The turbine rotates the generator which produce electricity. The sketch of a nuclear power station is shown in figure.

construction:

The main part of a nuclear reaction types. Here fuel is kept in the form of cylindrical tubes Reactor fuels are type uranium  was used as fuel in the elementary reactors. In this fuel the quantity of  is only 0.7 % in naturally occurring uranium 2. Moderator: 135 235 of U is increased fr 92 the fuel rods are placed in a substance of small atomic weight, such as water, heavy water, carbon o absorbed carbon etc, these substances are called moderators.
Function:

 The function of these moderators is to slow down the speed of neutrons produced during fission process. Heavy water Hydrogen instead of H. The neutrons produced in the fission reaction are very fast and are not suitable for is made of H, a heavy isotopes further fission in u and Pu. For this purpose stow neutrons are more useful. To slow down the fast neutrons into slow neutrons moderators are used. 235 239 action. only from each 92 or  94.