Advantages. The primary advantage of liquid metal coolants, such as liquid sodium, is that metal atoms are weak neutron moderators. … Sodium need not be pressurized since its boiling point is much higher than the reactor’s operating temperature, and sodium does not corrode steel reactor parts.
Which liquid is used as coolant in nuclear reactor?
A substance circulated through a nuclear reactor to remove or transfer heat. The most commonly used coolant in the United States is water. Other coolants include heavy water, air, carbon dioxide, helium, liquid sodium, and a sodium-potassium alloy.
What are advantages of liquid sodium cooled reactors?
The sodium-cooled fast reactor (SFR) uses liquid metal (sodium) as a coolant instead of water that is typically used in U.S. commercial power plants. This allows for the coolant to operate at higher temperatures and lower pressures than current reactors—improving the efficiency and safety of the system.
Why is liquid sodium used as a coolant in fast breeder reactor?
Liquid sodium is used as a coolant in fast breeder reactors on account of its excellent heat transfer properties. It must, however, be in the pure form to be compatible with structural materials.
Why is water the best coolant for nuclear reactors?
It is used due to its availability and high heat capacity, both for cooling and heating. It is especially effective to transport heat through vaporization and condensation of water because of its very large latent heat of vaporization.
Why graphite is used in nuclear reactor?
The graphite bricks act as a moderator. They reduce the speed of neutrons and allow a nuclear reaction to be sustained.
Which is used as a coolant in fast breeder nuclear reactor?
The element sodium is a universally accepted fast breeder reactor (FBR) coolant. … In fast breeder type of nuclear reactors, heat is generated in the core of the reactor where fission chain reaction takesplace.
Why water is not used as coolant in fast breeder?
 Light water is a good coolant for thermal reactors but not for fast breeders; pressurized water also moderates (slows down) the neutrons because hydrogen-1 (H-1), which comprises much of water, has a scattering cross section of σ = 82.03 barns, far larger than any other atom.
Which metal is used as coolant in fast breeder nuclear reactors?
A: Liquid sodium metal is used as a coolant in fast breeder nuclear reactors.
What are uses of liquid sodium?
Liquid sodium is used as a heat transfer fluid in some types of nuclear reactors because it has the high thermal conductivity and low neutron absorption cross section required to achieve a high neutron flux in the reactor.
Which coolant is not commonly used for fast breeder reactor?
These slower neutrons are also called thermal neutrons because they are brought to the same temperature as the surrounding coolant. In contrast to most normal nuclear reactors, however, a fast reactor uses a coolant that is not an efficient moderator, such as liquid sodium, so its neutrons remain high-energy.
What’s the temperature of liquid sodium?
Sodium is a well-known low-melting-point (97.7°C) alkali metal, which has the main advantages of high thermal conductivity and low neutron absorption cross-section. Also, the relatively high boiling point (882.8°C) of sodium allows a reactor to operate at pressures close to ~ 0.1 MPa.