In LENR reactions there is only a small reduction in mass of the lattice host metal, sometimes attributed to nuclear collisions and transmutations.
By using nanoscale material, the adsorption of Hydrogen is faster and there is more hydrogen per surface area. These reactions occur in the bulk relatively close to the surface, so at nanoscale there is much better chance of hydrogen reactions running into each oTHER when the particle is that small.
If the base reaction point is 300+C, what was the final reaction temp?