A reasonable estimate is that 1.00  109 tons of natural uranium is available at concentrations exceeding 100 parts per million, of which 0.7% is the fissionable isotope 235U. Assume all the world's energy use (7.1  1012 J/s) is supplied by 235U fission in conventional nuclear reactors, releasing 208 MeV for each reaction. How long would the supply last? (The ton used in this exercise is a metric ton, or 1000 kg.)    please answer in year

A proposed nuclear reactor facility will have an electrical power output of 908 MW with a 31.3% efficiency in converting nuclear to electrical power. Assuming the average fission reaction produces 234 MeV, how many reactions will take place at the facility every second?

A large power reactor that has been in operation for some months is turned off, but residual activity in the core still produces 150 MW of power.  If the average energy per decay of the fission products is 0.96 MeV, what is the core activity in units of curies?

According to one estimate, there are 4.4 × 106 metric tons of world uranium reserves extractable at $130/kg or less. About 0.7% of naturally occurring uranium is the fissionable isotope235 U. (a) Calculate the mass of 235 U in this reserve in grams. (b) Find the number of moles of 235 U and convert to a number of atoms. (c) Assuming 208 MeV is obtained from each reaction and all this energy is captured, calculate the total energy that can be extracted from the reserve in joules. (d) Assuming world power consumption to be constant at 1.5 × 1013 J/s, how many years could the uranium reserves provide for all the world’s energy needs using conventional reactors that don’t generate nuclear fuel? (e) What conclusions can be drawn?

The electrical power output of a large nuclear reactor facility is 935 MW. It has a 39.0% efficiency in converting nuclear power to electrical. (a) What is the thermal nuclear power output in megawatts? (b) How many 235U nuclei fission each second, assuming the average fission produces 200 MeV? (c) What mass (in kg) of 235U is fissioned in one year of full-power operation?