top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration

Which is used as a moderator in nuclear reactor?

0 votes
Which is used as a moderator in nuclear reactor?
posted May 6, 2016 by Prithvi

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

The moderator, which is of importance in thermal reactors, is used to moderate, that is, to slow down, neutrons from fission to thermal energies. The probability that fission will occur depends on incident neutron energy. Physicists calculate with fission cross-section, which determines this probability.
Nuclei with low mass numbers are most effective for this purpose, so the moderator is always a low-mass-number material. In a fast reactor there is no moderator, only fuel and coolant. The moderation of neutrons is undesirable in fast reactors. Commonly used moderators include regular (light) water (roughly 75% of the world’s reactors), solid graphite (20% of reactors) and heavy water (5% of reactors). Beryllium and beryllium oxide (BeO) have been used occasionally, but they are very costly.

enter image description here

answer Mar 21, 2017 by Shivaranjini
Similar Questions
+1 vote

Where was a nuclear reactor accident that resulted in a severe release of radioactivity following a massive power excursion which destroyed the reactor on 26 April 1986 at 01:23:45 a.m.?

0 votes

A peace camp was established at which RAF base in Berkshire, England from 1981 to 2000 to protest at nuclear weapons being sited there?

+1 vote

What is the name given to a cataclysmic nuclear explosion caused by the accretion of hydrogen onto the surface of a white dwarf star?

Contact Us
+91 9880187415
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Karnataka INDIA.