Nuclear fission has much more energy that is contained in the strong nuclear force in atom.
Strong Nuclear Force
The strong force acts between quarks. Unlike all other forces (electromagnetic, weak, and gravitational), the strong force does not diminish in strength with increasing distance between pairs of quarks. After a limiting distance (about the size of a hadron) has been reached, it remains at a strength of about 10,000 newtons (N), no matter how much farther the distance between the quarks.[5]
Fission
Typical fission events release about two hundred million eV (200 MeV) of energy, the equivalent of roughly >2 trillion Kelvin, for each fission event.
Size of Nucleus:
The size (diameter) of the nucleus is between 1.6 fm (10−15 m) (for a proton in light hydrogen) to about 15 fm (for the heaviest atoms, such as uranium).
10,000/(15*10^-15)=.000000000000666 and that converts to 4.15684331565551 MeV.
and
200MeV converts to 0.0000000000320435 Newton meters.
There is an order difference of 4,800 times more energy in the fission reaction than the strong nuclear force.