> Passive afterglow heat removal is the thing that lets reactors of any fuel form be safer than today's typical reactors, which generally require backup power t

> Passive afterglow heat removal is the thing that lets reactors of any fuel form be safer than today's typical reactors, which generally require backup power to run the cooling systems. NuScale does not require backup power. They solve the afterglow heat removal problem by running the reactors under millions of gallons of water. By the time it all boils away (about a month), passive air cooling is sufficient.