Since the effect is unexplained by accepted theory, making predictions about how to use it is impossible. So for the remainder of the answer I will assume that the mechanism is the one I described in the answer here: Why is cold fusion considered bogus? , that it is due to deuterons accelerated by K-shell holes, that fuse into alpha-particles, which then fly around making more K-shell holes in a chain reaction. This doesn't require new laws of fundamental physics, it simply postulates that deuterons and inner-shell excitations are quantum mechanically mixed in a metal, which is completely plausible just from electrostatic matrix elements estimates. The inner shell excitation energy for Pd is 20KeV, well above the threshhold for producing fusion. The charged particles produced from a fusion event naturally produce K-shell excitations (and other excitations in all levels, according to the Bethe theory of charged ionizing radiation), so there is a potential for a chain reaction. Any fusion reaction must proceed by dumping energy into electrons or nuclei, so that neutrons and protons don't come flying out, and this is not excluded from alpha-particle spectroscopy (although, again, deuterium fusion inside a high-density material has not been studied experimentally or theoretically to any great extent).