mikmckn t1_ivu92ao wrote
Reply to comment by luckyluke193 in Why do neutrons tend to interact more readily with light nuclei rather than heavy ones (i.e., why is water a better neutron shield than lead)? by Calgaris_Rex
As long as you don't allow any oxygen in, hydrogen is pretty tame. That's one of the safety issues with compromised water cooled reactors; the heat causes the water to split into it's component atoms and you end up with pure hydrogen, pure oxygen and a whole lot of heat.
That's why it's important to keep water on your core.
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