How Much U-235 is Consumed by a 1 GW Nuclear Power Plant in 18 Months?

[Akim679]

If a 1 GW nuclear power plant runs continuously for 18 months, determine the mass of U 235 consumed by the plant, assuming an average fission energy yield of 202 MeV. Any help would be appreciated.

 

[gmax137]

OK, figure out how many fissions take place over that 18 months. How much does that many atoms of 235U weigh? The first question is a simple matter of units (converting eV to watts (or watt-hours...)