From: Eric Walker
There is at least one relevant indicium that NiH is a nuclear process: http://b-i.forbesimg.com/markgibbs/files/2013/05/130520_ragone_04.png Hmm… your assumption seems to be that if any reaction is an outlier to the main grouping, and much higher in energy or power density (than the chemical, mechanical etc reactions shown)… as NiH appears to be if we trust the data - then it must be nuclear, since the nuclear reaction which is shown is much higher as well. If you think about that logically for a while, you will probably realize that your conclusion is false for reasons related to the incompleteness of the chart. First, there are forms of non-nuclear energy release which are not plotted, and are higher in energy density than ones shown (such as electron-positron annihilation) and secondly there is a basic correlation error because the outliers are themselves in very different locations. The most that one can say is that power and energy characteristics of Ni-H do not resemble the main grouping, but they also do not resemble the nuclear parameters either.