How much power is in one gram of commercial-grade uranium?

I'm doing a project for my physics class to learn how uranium is needed to my city for 6 months. I found all the necessary information from others but do not seem to find the number of commercial-grade uranium for energy produces.

Assuming a typical nuclear power plant produces 1000 MW / hour of electricity requires about 3,000 MW / hour of heat. Make a direct mass energy conversion with e = mc ^ 2, the amount of energy 24 hours a day, 365 days a year is about 350 grams of dough. Now, when a particular U-235 fission of the atom, only a fraction of the mass is converted into energy. Most of the mass ends up as derivatives, which are lighter elements. Thus, grams of more than 350 U-235 fission need to get as much power.

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