Plutonium
They are simply called the Control Rods!
A boron steel alloy is the most common material used, boron is the neutron absorber.
Nuclear Power plants use refined uranium or plutonium. Both of these elements are extremely radioactive and unstable. In order to control the explosive reaction (google atomic bombs), they use control rods in the process to slow the reaction rate, keeping it under control. These control rods, along with all clothing, tools, and other items taken into the reaction chamber become nuclear waste. This is one cause for debate against nuclear energy as there are no means of destroying/disposing of these waste products. But that is a different debate.
Not really. Control rods are used to start up and shut down a nuclear reactor.
Moderator such as graphite or heavy water would reduce the speed of neutron there by making them as thermal neutrons. Such slow speed neutrons are needed to bring Uranium-235 into fission. Control rods such as Boron carbide or Cadmium are there to abosorb neutrons. So chain reaction of fission is ketp under control.
No, Enriched Uranium-235 is used in a nuclear reactor as the fuel in the fuel rods and boron is used in the control rods.
They are simply called the Control Rods!
A boron steel alloy is the most common material used, boron is the neutron absorber.
Nuclear power plants are self starting because there is always a small number of fissions taking place in the uranium fuel, so as soon as the reactor is made critical by withdrawing the control rods the chain reaction starts.
Hanger rods are used in nuclear power plans as a means by which to control the fission reactions and thereby prevent meltdowns. The rods absorb free neutrons and thus limit the number of fission reactions taking place at any given moment. To this extent, rods can be either added or taken away to control the fission rate (and consequently the power output)
shielding, fuel, control rods, moderator, and coolant
fuel rods and control rods
to cool the heating rods and generate electricity
Plutonium is used for nuclear fuels not for control rods.
No, it is not correct; only a nuclear chain reaction can be stopped with control rods.
Reactions that involve nuclei, called nuclear reactions, result in a tremendous amount of energy. Two types are fission and fusion.
No, but control rods do.