[Ronaldus Magnus]

I am not going to debate geothermal boring technology on this forum, but there are several major errors in your statement. The first is that a nuclear blast would result in a volcano. You are either overestimating the blast force of a nuclear explosive or underestimating the distance to the magma. You are also grossly overestimating the radioactive loss to the atmosphere of a below ground nuclear blast.

This proposal for a nuclear cascade induced venting has been discussed and analyzed in the academic literature. The basic premise is for a series of sub-ground nuclear blasts to loosen the upper crust sufficiently to let the pressure ooze rather than blow. If this interests you, look it up.

[Robert A Cook PE]

True.

But the radioactive trash left over from each blast, even if kept deposited underground (that is, the blast DOES NOT cause a complete sudden venting) will still be present.

When the magma and hot rocks that are going to be moved as the pressure is released get to the surface, their radioactive cargo is still going to get carried up, some of which can escape and be released.

Some will be permanently buried in the magma and underground pockets when the magma hardens. But not all will.

And, magma (by definition) is volatile and can get remelted in later eruptions. The lava tunnels in Idaho west of Yellowstone are remnants of these lava flows, and obviously, ALMOST ALL of their contents kept flowing and was released.