Because water has a very high specific heat and is capable of absorbing a large amount of heat energy without changing temperature.
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You will have to be a citizen and then if you're nice and kind to everyone you would have a good chance on being an agent or moderator
They are the same in that they don't allow reactor coolant water boiling in the primary water coolant loop. They are different in that in PHWR the moderator is heavy water while in PWR the moderator is normal light water.
Normal water, or light water, absorbs too many neutrons to be an effective moderator in a nuclear reactor. This absorption can make it difficult to sustain a nuclear chain reaction. Instead, reactors often use heavy water or graphite as a moderator, which have lower neutron absorption rates.
This is the function of the moderator, which may be heavy water, light water, or graphite
moderator, coolant
Carbon is a very good moderator, for use in gascooled reactors, the others not.
By emailing Horseland why you want to be a mod and will be a good one.
Room temp.
slightly warm water is good, with lots of soap
because it smell good
Room temperature water is the best.