Why
(i) In a natural uranium reactor, heavy water is preferred moderator over ordinary water?
(ii) Control rods are used to control the reaction rate?
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Answer (i) :
Heavy water is basically used as a moderator in nuclear reactors to slow down the neutrons so that they are captured and become effective to bring about the fission reaction. The main reason why heavy water is used as a moderator is because it captures less neutrons than the normal water.
Answer (ii) :
A control rod is a device that is used to absorb neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed down or stopped completely by inserting the rods further, or accelerated by removing them slightly.
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