Mechanical Engineering - IC Engines and Nuclear Power Plants - Discussion
Discussion Forum : IC Engines and Nuclear Power Plants - Section 1 (Q.No. 9)
9.
A moderator generally used in nuclear power plants is
Discussion:
38 comments Page 1 of 4.
DEBASHISH SAHA said:
1 decade ago
A substance, such as graphite, water, or heavy water, placed in a nuclear reactor to slow neutrons down to speeds at which they are more likely to be captured by fissionable components of a fuel (such as uranium-235) and less likely to be absorbed by non fissionable components of a fuel (such as uranium-238). Also called neutron moderator. & concrete its not a moderator.
(1)
Bhaskar said:
9 years ago
In nuclear power plants, heavy water (D20) is mostly used as a moderator to slow down fast moving neutrons released in fission process and in sometimes graphite may be used but concrete cannot be used.
Concrete is used to make a protective shield of about 5 to 6m thick to avoid the neutrons and ultraviolet waves escaping from the reactor.
Concrete is used to make a protective shield of about 5 to 6m thick to avoid the neutrons and ultraviolet waves escaping from the reactor.
Jay said:
9 years ago
The answer should be heavy water, graphite or light water. Concrete is not a moderator.
Heavy water has highest moderating ration while light water has least and graphite has its moderating ration between those of heavy and light water.
Heavy water has highest moderating ration while light water has least and graphite has its moderating ration between those of heavy and light water.
Adi said:
1 decade ago
In a nuclear reactor, a moderator is a material in the core, which slows down the neutrons released from fission so that they cause more fission. It is usually water, but may also be graphite.
Muhammad Tayyab said:
5 years ago
Graphite is commonly used as a moderator in nuclear power plant.
Heavy water is also used as a moderator although less frequently.
Concrete is commonly used as a shielding material.
Heavy water is also used as a moderator although less frequently.
Concrete is commonly used as a shielding material.
(1)
Raviteja said:
1 decade ago
If graphite or concrete is used, it is a big deal to change the material simultaneously, but water can change, so, mostly water is used as moderator.
Gopi said:
9 months ago
Concrete is wrong. Heavy water and graphite are used as moderators.
It is used as shielding material to protect from radiation.
It is used as shielding material to protect from radiation.
Joydeep c said:
1 decade ago
Concrete can never be used as a moderator. Rather it is used as a protective shields to protect from neutrons and gamma rays.
Prashant Yadav said:
7 years ago
As per my knowledge the heavy water is used as a moderator to slow down the speed of neutrons making capable it for fission.
Ankit gupta said:
8 years ago
Concrete/ graphite rods use as control rods and heavy water us as a moderator.
So heavy water is the right answer.
So heavy water is the right answer.
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