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Nuclear fission of Uranium-235 is more efficient when hit by neutrons with low energy of the order of electron volts. However, neutrons coming from fission are at high energies around 2 megaelectron volt. Accordingly, the moderator is needed to slow down the neutrons coming from fission to low energy values through scattering process with moderator molecules. This is the concept of the so called "thermal nuclear reactors"
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Do moderator in nuclear reactor slows down the neutrons emitted during fission?
Yes, it is the main moderator function in what is called "thermal nuclear reactors"
Why is the moderator important in a nuclear reactor?
The moderator is used to slow down the neutrons present in the core of the reactor. Normally the neutrons produced as the nuclear fuel (e.g. uranium) is fissioned are travelling too fast to produce a sustained chain reaction. Some examples of moderators are cadmium, heavy water and graphite.
Why moderator is not used in case of fast breeder reactor?
Moderator is not used in case of fast breeder reactor because there is no need to slow down neutron energy. Nuclear fission takes place at high energy of neutrons.
In nuclear reactor heavy water is used as?
Heavy water (deuterium) functions as a moderator. It slows down fast neutrons released by fission reactions in order to allow the reaction to be sustained. Fast neutrons pass through the reactor before initiating another fission reaction.
Which material is used in controlling chain reaction in nuclear reactor?
The material used to slow down high-speed neutrons in a reactor is called the moderator. The moderator in a pressurized water reactor is the water, which is the main coolant. Collisions between the neutron and hydrogen nuclei (protons) slow the neutron down (thermalizing it) and increasing the probability that it will be absorbed by another fissionable atom. That makes the chain go, it maintains the chain reaction. Slowing down neutrons does NOTslow down the process of nuclear fission. If anything, it maintains it or speeds it up because slower moving neutrons have a higher probability of being absorbed and continuing or building the chain reaction. A link is provided.
Do moderator in nuclear reactor slows down the neutrons emitted during fission?
Yes, it is the main moderator function in what is called "thermal nuclear reactors"
Why is the moderator important in a nuclear reactor?
The moderator is used to slow down the neutrons present in the core of the reactor. Normally the neutrons produced as the nuclear fuel (e.g. uranium) is fissioned are travelling too fast to produce a sustained chain reaction. Some examples of moderators are cadmium, heavy water and graphite.
In a nuclear reactor the moderator is usually made of graphite placed between the fuel rods used to slow down neutrons all of the above none of the above?
The moderator in a nuclear reactor is usually made of graphite, which is used to slow down neutrons. So, the correct answer is "all of the above".
What is the function of a moderator in a reactor?
A moderator in a nuclear reactor slows down fast-moving neutrons to increase the likelihood of fission reactions. By reducing the speed of neutrons, the moderator helps maintain a chain reaction within the reactor core. This process helps control the nuclear reaction and sustain the reactor's power output.
Slows down neutrons in a nuclear reactor?
In a nuclear reactor, materials such as water or graphite are commonly used as neutron moderators to slow down fast-moving neutrons to speeds where they are more likely to induce fission in uranium or plutonium atoms. Slowed down neutrons are termed thermal neutrons and are key to sustaining a nuclear chain reaction.
Why moderator is not used in case of fast breeder reactor?
Moderator is not used in case of fast breeder reactor because there is no need to slow down neutron energy. Nuclear fission takes place at high energy of neutrons.
Primary function of moderator in nuclear reactor?
The primary function of a moderator in a nuclear reactor is to slow down the fast neutrons produced during fission reactions, making them more likely to cause additional fission events. This helps sustain a chain reaction by ensuring a sufficient number of neutrons are available to continue the process. Common moderators include water, graphite, and heavy water.
What is the function of graphite in a nuclear reactor?
Graphite is used as a moderator in nuclear reactors to slow down neutrons produced during nuclear fission. Slower neutrons are more likely to cause additional fission reactions, allowing for a sustained nuclear reaction. Graphite is also used as a structural material in some reactor designs.
Why is a moderator necessary in a reactor?
A moderator is necessary in a reactor to slow down fast-moving neutrons produced during nuclear fission. This helps control the rate of reaction and enables more neutrons to be captured by other atoms, sustaining the chain reaction. Additionally, the moderator helps manage the temperature and pressure within the reactor to prevent overheating and maintain stability.
In nuclear reactor heavy water is used as?
Heavy water (deuterium) functions as a moderator. It slows down fast neutrons released by fission reactions in order to allow the reaction to be sustained. Fast neutrons pass through the reactor before initiating another fission reaction.
Why neutrons are made slow in a reactor?
Neutrons are slowed down in a reactor to increase the likelihood of them causing fission reactions in nuclear fuel. Slower neutrons are more easily absorbed by the fuel, increasing the overall efficiency of the reactor. This process is achieved through a moderator, such as water or graphite, which helps reduce the speed of the neutrons.
Does a breeder nuclear reactor use moderator?
No, a breeder nuclear reactor does not typically use a moderator. Breeder reactors are designed to produce more fissile material than they consume by using fast neutrons to convert non-fissile isotopes into fissile ones without slowing down the neutrons.
