Correct Answer - Option 4 : Both D
2O Graphite
Concept:
Nuclear Reactor
A nuclear reactor is a device in which nuclear reactions are initiated, controlled, and sustained at a steady rate.
Nuclear reactor basic principles
- Neutron-induced fission releases energy with extra fast neutrons.
- These fast neutrons are then slowed down by a moderator, allowing a chain reaction to take place.
- The Chain reaction is controlled by controlling the condition of the moderator, or by use of the neutron absorbing materials such as cadmium control rods.
- Heat is removed by some form of heat exchanger where it is used to run a heat engine.
Explanation:
Moderators
- Moderator is required in a Nuclear reactor to slow down the neutrons produced during the fission reaction.
- Heavy Water is an excellent moderator due to its high moderating ratio and low absorption cross-section for neutrons.
- Also, it does not capture any neutrons.
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Graphite and heavy water (D2O) can also be used as a moderator in a nuclear reactor.