If there is uranium-238 present, the rate of spontaneous fission will be much higher.
In what context is this true?
I am just wondering why the U238 is removed to make enriched U235 for the fuel.
So if we apply the same principles to fusion
Free neutrons are detected at very very low amounts... far below U235 emissions.
The LENR appears to be sustained in hotspots or " otspots"(Biberian) for long periods
in palladium/H2 electrolysis.. 50 -100 ? microns in size
the mechanism of limited propagation appears to have something to do with the
isotopic/isomeric makeup of the hotspot..perhaps metastable isomers.