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The moderator is there to slow down the neutrons produced by fission. These are produced with high energy, that is they move fast, but Uranium235 has a capture cross section much greater for slow neutrons, so they need to be slowed down to make the chain reaction more efficient. Graphite and heavy water are good moderators, and don't absorb too many neutrons, so they can be used even with natural (non-enriched) uranium. Normal water is not so good but it is ok if the uranium is enriched to about 4 percent U235.

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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.


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.


Can you use tritium water as moderator in nuclear reactor?

Yes, tritium water can be used as a moderator in a nuclear reactor. However, tritium itself is a radioactive isotope of hydrogen, so careful handling and safety measures are required due to its potential health risks. Research is being conducted on the use of tritium in nuclear fusion reactors, but it is not commonly used as a moderator in fission reactors.


What are the moderator used in a nuclear reactor with natural uranium?

Graphite rods are used as moderators in a nuclear reactor with natural uranium. Graphite slows down the fast neutrons released during fission reactions, allowing them to cause further reactions and sustain the chain reaction. This is necessary because natural uranium is not as efficient at sustaining a chain reaction without a moderator.


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.

Related Questions

Which is used as moderator in nuclear reactor?

Control rods are used as moderators in nuclear reactors to regulate the rate of fission reactions by absorbing neutrons. By adjusting the position of the control rods, the reactor can be managed to sustain a controlled 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.


Why normal water is not used as moderator in nuclear reactor?

Normal water, or light water, absorbs too many neutrons to be an effective moderator in a nuclear reactor. This absorption can make it difficult to sustain a nuclear chain reaction. Instead, reactors often use heavy water or graphite as a moderator, which have lower neutron absorption rates.


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".


Do substance is used as moderator in modern nuclear reactor?

Water (H2), or heavy water (D2O). Sometimes, liquid sodium is used.


The moderator used in the nuclear reactor at Madras atomic power station in Kalpakkam is?

The moderator used in the nuclear reactor at Madras Atomic Power Station in Kalpakkam is usually heavy water (deuterium oxide) or light water (ordinary water). These moderators are important for slowing down neutrons produced during nuclear fission reactions to sustain the chain reaction in the reactor.


Can you use tritium water as moderator in nuclear reactor?

Yes, tritium water can be used as a moderator in a nuclear reactor. However, tritium itself is a radioactive isotope of hydrogen, so careful handling and safety measures are required due to its potential health risks. Research is being conducted on the use of tritium in nuclear fusion reactors, but it is not commonly used as a moderator in fission reactors.


What are the moderator used in a nuclear reactor with natural uranium?

Graphite rods are used as moderators in a nuclear reactor with natural uranium. Graphite slows down the fast neutrons released during fission reactions, allowing them to cause further reactions and sustain the chain reaction. This is necessary because natural uranium is not as efficient at sustaining a chain reaction without a moderator.


What type of coolants is usually used to remove heat from a nuclear reactor core?

Water is the most common coolant used to remove heat from a nuclear reactor core. In pressurized water reactors (PWRs), water is used both as a coolant and as a moderator.


Which is used as a moderator in nuclear reactor?

Most current power plants use water, but heavy water, graphite, hydrocarbons, etc. could be used instead.


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.