Supernova Energy = Earth's Energy

Supernovae occur when giant stars collapse under their own weight due to declining energy from fusion keeping them inflated. Once the collapse of volume begins, the falling material accelerates and concentrates/condenses until nucleons are fusing into radioactive elements heavier than iron. Eventually something happens to stop the collapse and the energy 'bounces back' and causes a giant explosion, which sends the radioactive material outward in all directions.

Earth's sun is too small for it to generate heavy elements, so radioactive 'ash' from distance supernovas is required to provide nuclear power for Earth's core. Though sunlight absorbed as biomass and subducted through plate tectonics may contribute to core/mantle heat, most people dismiss this as a significant or primary source of interior energy.

Interestingly, if we consider the explosive power of supernovae in terms of their pre-collapse stellar power, that power is transferred to Earth via meteors. Major planetary extinction events coincide with mantle plumes and sometimes large meteor strikes. Ironically, the plumes and meteors might be related insofar as the meteors deliver fresh radioactive fuel to power the core heat, which causes a plume to boil up.

Now the question is if Earth would sustain a long period free of such meteor 'deliveries' of radioactive fuel, would it gradually cool and solidify so that the magnetic field eventually weakens and disappears leaving Earth vulnerable to cosmic radiation? If NASA develops an effective meteor defense system, would that starve Earth of fresh radioactive material? Further, do we have to undergo violent meteor strikes and the corresponding extinction event levels of climate disturbance to maintain Earth's interior energy, or could we find some other way to sustainable import energy from outside Earth without altering the climate?