How are chain reactions controlled in a nuclear reactor?

In a nuclear power station nuclear fuel undergoes a controlled chain reaction in the reactor to produce heat – nuclear to heat energy. The chain reaction is controlled by Boron control rods. … When the Boron absorbs the neutrons then the chain reaction will slow down due to lack of neutrons producing reactions.

What is chain reaction and how is it controlled in nuclear reactor?

A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

What controls the chain reaction in a nuclear reactor quizlet?

By control rods and the moderator. They absorb neutrons allowing the reactor to produce energy at a steady rate. In a controlled chain reaction, on average only one neutron from each fission will strike another nucleus and cause further stimulated fission to occur.

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Is the chain reaction in a nuclear bomb controlled?

Fission chain reactions occur because of interactions between neutrons and fissile isotopes (such as 235U). … Nuclear weapons, on the other hand, are specifically engineered to produce a reaction that is so fast and intense it cannot be controlled after it has started.

What is the chain reaction How OT is controlled?

As the reaction proceeds, the number of uranium-235 nuclei decreases and fission by-products which absorb neutrons build up. To keep the chain reaction going, the control rods must be withdrawn further. At some point, the chain reaction cannot be maintained and the fuel must be replenished.

What is a controlled nuclear reaction?

To maintain a sustained controlled nuclear reaction, for every 2 or 3 neutrons released, only one must be allowed to strike another uranium nucleus. Most reactors are controlled by means of control rods that are made of a strongly neutron-absorbent material such as boron or cadmium. …

What do control rods do in a nuclear reactor?

A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.

How do nuclear reactors keep nuclear chain reactions from getting explosive?

How do nuclear reactors keep nuclear chain reactions from getting explosive? Control rods are placed between the fuel rods. The control rods absorb the neutrons and slow down the chain reaction.

What is the purpose of the chain reaction in a nuclear power plant quizlet?

A chain reaction results that releases energy and produces more neutrons. Energy released from the fission reaction heats a closed loop of water.

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How do we control the fission rate in the reactor?

Control rods are used in nuclear reactors to control the rate of fission of the nuclear fuel – uranium or plutonium. Their compositions include chemical elements such as boron, cadmium, silver, hafnium, or indium, that are capable of absorbing many neutrons without themselves fissioning.

Why would a chain reaction need to be controlled in a nuclear reactor but not in a nuclear bomb?

The additional neutrons released may also hit other uranium or plutonium nuclei and cause them to split. Even more neutrons are then released, which in turn can split more nuclei. This is called a chain reaction. The chain reaction in nuclear reactors is controlled to stop it moving too quickly.

How many control rods are in a nuclear reactor?

Typical reactors can contain around 50 of these clusters with 20 individual control rods in each cluster. The ability of a control rod to absorb neutrons to control the fission chain reaction requires a choice of material that has high neutron-absorbing abilities.

Why does a nuclear chain reaction stop?

The only way to control or stop a nuclear chain reaction is to stop the neutrons from splitting more atoms. … In that case, the chain reaction stops. As the rods are raised, less of each rod absorbs neutrons, and the chain reaction speeds up.