Nuclear Reactor
Definition and meaning of Nuclear Reactor in chemistry.
A nuclear reactor is a device used to initiate and control a self-sustained nuclear chain reaction. These systems are primarily used for generating electricity, propelling ships, or producing radioactive isotopes for medical and industrial applications.
In more detail
Reactors rely on the fission of heavy isotopes, such as uranium-235 or plutonium-239, triggered by neutron absorption. When a nucleus splits, it releases a massive amount of heat and additional neutrons, which can induce further fissions. Control rods made of neutron-absorbing materials are inserted into the reactor core to regulate the reaction rate. A coolant, often water, flows through the core to transfer the generated heat to turbines that produce electricity.
Key facts
| Field | Physical Chemistry |
|---|---|
| Primary Fuel Types | Uranium-235 and Plutonium-239 |
| Key Component | Control rods |
A pressurized water reactor uses light water as both a coolant and a neutron moderator, keeping the water under high pressure so it does not boil in the primary cooling loop.
Frequently asked questions
What is the role of a moderator in a nuclear reactor?
A moderator slows down fast neutrons produced by fission, making them more likely to cause further fission events.
How do control rods work?
They absorb neutrons to safely decrease or halt the fission chain reaction within the core.