Why are thorium reactors not used?
Thorium has no isotopes that readily fission to produce energy. So thorium is not usable as a fuel directly, but is instead a fertile nucleus that can be converted to uranium in a reactor. Only after conversion to uranium does thorium become useful as a nuclear fuel.
What are the advantages of a breeder reactor over a conventional nuclear fission reactor?
Whereas a conventional nuclear reactor can use only the readily fissionable but more scarce isotope uranium-235 for fuel, a breeder reactor employs either uranium-238 or thorium, of which sizable quantities are available. Uranium-238, for example, accounts for more than 99 percent of all naturally occurring uranium.
What are the advantages of thorium reactors?
Thorium-based reactors are safer because the reaction can easily be stopped and because the operation does not have to take place under extreme pressures. Compared to uranium reactors, thorium reactors produce far less waste and the waste that is generated is much less radioactive and much shorter-lived.
What are the advantages of breeder reactors?
Some fast breeder reactors can generate up to 30 percent more fuel than they use. Creating extra fuel in nuclear reactors, however, is not without its concerns: One is that the plutonium produced can be removed and used in nuclear weapons.
Are thorium reactors viable?
There is a significant sticking point to the promotion of thorium as the ‘great green hope’ of clean energy production: it remains unproven on a commercial scale. ‘Without exception, [thorium reactors] have never been commercially viable, nor do any of the intended new designs even remotely seem to be viable.
How does a thorium reactor work?
Types of thorium-based reactors Instead of using fuel rods, molten salt reactors use compounds of fissile materials, in the form of molten salts that cycle through the core to undergo fission. The molten salt then carries the heat produced by the reactions away from the core, and exchanges it with a secondary medium.
Why do breeder reactors require reprocessing?
Reprocessing. Fission of the nuclear fuel in any reactor produces neutron-absorbing fission products. Because of this unavoidable physical process, it is necessary to reprocess the fertile material from a breeder reactor to remove those neutron poisons.
What are the pros and cons of thorium?
As the mine in case of thorium is an open pit, its mining is found to be safer than uranium mining. Disadvantages of thorium reactors: High start-up costs: Huge investments are needed for thorium nuclear power reactor, as it requires significant amount of testing, analysis and licensing work.
How efficient are thorium reactors?
Lastly, a thorium plant will operate at about 45 percent thermal efficiency, with upcoming turbine cycles possibly improving the overall efficiency to 50 percent or greater, meaning a thorium plant can be up to 20 percent more efficient than a traditional light-water reactor.
Do breeder reactors reduce nuclear waste?
The volume of waste they generate would be reduced by a factor of about 100 as well. While there is a huge reduction in the volume of waste from a breeder reactor, the activity of the waste is about the same as that produced by a light-water reactor.
What is fast breeder reactor technology?
A Fast Breeder Reactor (FBR) is a nuclear reactor that uses fast neutron to generate more nuclear fuels than they consume while generating power, dramatically enhancing the efficiency of the use of resources. Nuclear fission by fast neutron causes the increase in neutrons generated.