Question

How much mass is converted ro energy per day in a nuclear power plant operated at a level of 100 MW?

Answer 1

10 MW $= 10^{7} \frac {J}{sec}$

Energy produce per day $= 10^7\times 24 \times 60\times 60 =864 \times 10^{9}$

$E = \triangle m c^2$

$\triangle m = \frac {c^2}{E} = \frac{(3\times10^8)^2 }{864 \times 10^{9} } = 104.166\times 10^3 kg$