Q17
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
A.
Slow down the speed of fast moving neutrons
AnswerB.
Control the reaction
C.
Reduce the temperature
D.
Extracts heat from nuclear reaction
Answer: Option A
Solution
Answer: Option A
Solution:
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to slow down the speed of fast moving neutrons.The moderator, which is of importance in thermal reactors, is used to moderate, that is, to slow down, neutrons from fission to thermal energies.
Commonly used moderators include regular water, solid graphite and heavy water.