Assuming that about $20.\,MeV$ of energy is released per fusion reaction
${ }_{1} H ^{2}+{ }_{1} H ^{3} \rightarrow{ }_{0} n^{1}+{ }_{2} He ^{4}$
then the mass of ${ }_{1} H ^{2}$ consumed per day in a fusion reactor of power $1\, MW $ will approximately be