Silver-indium-cadmium alloys, generally 80% Ag, 15% In, and 5% Cd, are a common control rod material for pressurized water reactors. The somewhat different energy absorption regions of the materials make the alloy an excellent neutron absorber. It has good mechanical strength and can be easily fabricated.
Which is used as control rods in nuclear reactor?
Boron carbide is used as a control rod material.
Which of the following is used as control rod?
We can use cadmium rods as control rods because they have the ability to absorb neutrons without fissioning themselves.
Why is cadmium used as control rods?
As cadmium or boron easily absorbs slow moving neutrons. So, they are used in nuclear reactor to control the fission rate. When cadmium rod is pushed into the reactor, the fission rate decreases and when it is pulled out the fission rate increases.
How much energy does 1g of uranium produce?
The fission of 1 g of uranium or plutonium per day liberates about 1 MW. This is the energy equivalent of 3 tons of coal or about 600 gallons of fuel oil per day, which when burned produces approximately 1/4 tonne of carbon dioxide. (A tonne, or metric ton, is 1000 kg.)
How do you control a nuclear reactor?
A neutron absorbing element must be present to control the amount of free neutrons in the reaction space. Most reactors are controlled by means of control rods that are made of a strongly neutron-absorbent material such as boron or cadmium.
How long do control rods last?
B4C control rods typically have lifetimes on the order of 6–8 years under normal circumstances. Keep in mind, in nuclear power terms, we deal with exposure limits to the high neutron and radiation flux and extreme environment inside the reactor cores rather than time limits.
Do control rods become radioactive?
Control rods are used in nuclear reactors to control the fission rate of uranium or plutonium.
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What is meant by control rods?
: a rod of a neutron-absorbing material (such as boron carbide) used to regulate the rate of nuclear fission in a reactor.
Which of the following correctly describes the role of a control rod?
The main function of the control rod is to control the rate of reaction. The nuclear chain reaction becomes uncontrolled when number of neutrons are not controlled. … The control rods are made up of boron,indium and cadmium like substances. They absorb the thermal neutrons generated in each decay of radioactive specimen.
Which one of the following is the most essential requirements of control rod material?
5. Which of the following is the most essential requirement of control rod material? 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.