Analysis of information sources in references of the Wikipedia article "Air berat" in Indonesian language version.
Heavy Water Reactors (HWRs) use "enriched" water, the molecules of which comprise hydrogen atoms that are made up to more than 99 per cent of deuterium, a heavier hydrogen isotope. This heavy water, used as a moderator, improves the overall neutron economy, allowing fuel to be used that does not require enrichment.