english: This means they don't have to be in heavy, thick steel pressure vessels, they don't have to use water for coolant and there's nothing in the reactor that's going to make a big change in density, like water.
non_english: To znači da ne moraju da budu u debelim čeličnim sudovima pod pritiskom, ne moraju da koriste vodu kao rashlađivač, i ne postoji ništa u reaktoru što će napraviti veliku promenu u gustini kao što bi voda.