In boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

Answer: Option A

Solution(By Examveda Team)

A boiling water reactor (BWR) uses demineralized water as a coolant and neutron moderator.
Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam.