The main MHE power generation pattern can be explained by the nuclear energy release of 4H/TSC WS fusion events at T-sites of Ni nano-cores by dynamic 4H cluster formation of 4 protons moved from O-sites under phonon excitations in GMPW (global mesoscopic potential well) of Ni-nano-islands. This is the major process of power (about 20W in our runs). In addition, minor excess power (about 4 W) is considered being continuously released by 4H/TSC WS fusion events at SNHs (sub-nano-holes) on surfaces of Ni-nano-cores. This minor process remains after H/Ni ratio is saturated. We found a method of MHE power re-activation by the RCV (reaction chamber valve) close-to-open method after H/Ni loading ratio becomes nearer to saturation. When RCV is opened, pulse thermal power generation happens by 4H/TSC WS fusions at SNHs, which induces H-gas desorption-burst from T-sites of Ni-nano-cores. This trigger event produces empty T-sites in Ni-nano-cores and slow H-loading to T-sites restarts with relatively large generation of 4H/TSC WS fusion power (10-15 W) for considerably long time (about one day in our trigger-trial runs). This re-activation/trigger process can be repeated in-situ. We succeeded to trigger more than ten times.Prediction by the TSC theory seems working very well. Some brief historical aspects of "cold fusion" or MHE research evolution are of portion in Introduction.