What is the purpose of reflectors in thermal power reactors?

Reflectors in thermal power reactors serve to improve neutron economy by reflecting neutrons back into the core, thereby increasing the likelihood of those neutrons being absorbed by fissile material. This process enhances the overall neutron population within the reactor, which is vital for sustaining the fission chain reaction.

In a thermal reactor, efficient use of neutrons is crucial, as thermal neutrons are primarily responsible for inducing fission in fuel like uranium-235. By having reflectors in place, neutrons that would otherwise escape the reactor core are redirected, reducing neutron leakage and ensuring a higher probability that they will contribute to sustaining fission rather than being lost to the environment.

This improved neutron economy leads to more efficient fuel use and can potentially enhance the reactor's overall performance and output. Since reflectors can effectively make better use of the neutrons produced in fission, they play a key role in optimizing reactor design and operation.