Paper 1 · People, Development and Environment
UGC NET June 2023 (14.06.2023) Shift-I
Light Water Reactors (LWR) are nuclear reactors
AWhich use heavy water as a coolant
BWhich use graphite rods as a moderator
CWhich use ordinary water as a moderator ✓ Correct
DWhich use steam as a moderator
Correct answer: (C) Which use ordinary water as a moderator — Light water reactors use ordinary water as the moderator, so the answer is ordinary water as a moderator.
Explanation
★Light water reactors use ordinary water as the moderator, so the answer is ordinary water as a moderator.
★A moderator slows fast neutrons so they can sustain the fission chain reaction.
★In a light water reactor ordinary water serves as both coolant and moderator.
★Light water simply means ordinary water, in contrast to heavy water which contains deuterium.
★Heavy water and graphite are moderators used in other reactor types, not light water reactors.
★Steam is not used as a moderator, since a gas is far too sparse to slow neutrons effectively.
★Light water reactors are the most common type of thermal-neutron nuclear reactor worldwide.
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