Assertion: water moderator | /r/HasProperty | pure regular water
Facets:
value: very
type: DEGREE
value: essentially
type: DEGREE
Source sentences:
text: The much cheaper light water moderator (essentially very pure regular water) absorbs too many neutrons to be used with unenriched natural uranium, and therefore uranium enrichment or nuclear reprocessing becomes necessary to operate such reactors, increasing overall costs.