Paul, as we know all too well, nuclear fission produces energy. How does your explanation differ from the conventional explanation? Example:

Total mass before the reaction ( mass of U-235 + n)
= 235.0439u + 1.0087u
= 236.0526u
Total mass after the reaction ( mass of Nd + Kr + 2n)
= 147.9169u + 85.9106u + 2 x 1.0087u
= 235.8449u
There is a decrease in mass by 0.2077u. This mass has been converted to energy.
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"Time is what prevents everything from happening at once" - John Wheeler