What are the function of control rods and moderator?

The moderator helps slow down the neutrons produced by fission to sustain the chain reaction. Control rods can then be inserted into the reactor core to reduce the reaction rate or withdrawn to increase it.

What is the function of moderator and reflector in nuclear reactor?

function in nuclear reactor A reflector is a region of unfueled material surrounding the core. Its function is to scatter neutrons that leak from the core, thereby returning some of them back into the core.

What is the function of the control rods 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.

What is the function of reflector?

A layer of material immediately surrounding a reactor core that scatters back (or reflects) into the core many neutrons that would otherwise escape. The returned neutrons can then cause more fissions and improve the neutron economy of the reactor.

What is the difference between moderator and control rod?

Moderators are made from materials with light nuclei which do not absorb the neutrons but rather slow them down by a series of collisions. Control rods are made from material with the ability to absorb neutrons; Cadmium and Boron are examples of suitable materials.

What is the main function of moderator Mcq?

The moderator is used to slow down the neutrons by absorbing some of the kinetic energy of neutrons by direct collision and thereby increasing the chances of fission.

What is a moderator in a nuclear reactor?

A material, such as ordinary water, heavy water, or graphite, that is used in a reactor to slow down high-velocity neutrons, thus increasing the likelihood of fission.

Which is the most commonly used moderator?

Water (sometimes called “light water” in this context) is the most commonly used moderator (roughly 75\% of the world’s reactors). Solid graphite (20\% of reactors) and heavy water (5\% of reactors) are the main alternatives.

What is the function of control rods Mcq?

Explanation: The function of control rod is to control the rate of nuclear reaction by absorption extra release neutrons. Chain reaction is controlled either by removing or inserting neutron absorbing materials.

What are the functions of moderator?

Moderators are the substance that slows down the neutrons in nuclear reactors. Moderators are made up of materials with light nuclei that do not absorb the neutrons but slow down the speed of neutrons by a series of successive collisions.

What is the function of control rods in nuclear reactors?

Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. They constitute a real-time control of the fission process, which is crucial for both keeping the fission chain reaction active and

What factors affect the fissile content of a nuclear reactor?

Some of these factors are inherent to the fissile fuel or reactor materials themselves, such as the number of neutrons produced in a fission event or the amount of neutron absorption due to fuel rod casings or moderators.

What are control rods and how do they work?

Control rods thereby find their use as an effective method for combating these time-dependent changes in reactors. Control rods are essentially a highly effective neutron-absorbing mechanical structure, which can be actively inserted or withdrawn from the reactor core while the fission process is occurring.

When is a nuclear reactor considered critical?

A reactor that is in a steady state (i.e. each individual fission event triggers exactly one subsequent fission event) has k= 1, and the reactor is said to be critical. If k 1, the reactor is subcriticaland the chain reaction cannot be sustained.