Based on the popular conclusion that collapse of a false vacuum destabilizes matter, the creation of false vacuums in higher energy scales might be expected to increase the stability of matter.

In other threads I have been exploring the possibility that extreme kinetic field energy of a fast moving vehicle modifies the quantum state of local space, boosting it to a higher scale of false vacuum.

In this context the normal scale represents a ZPE oscillator with spin angular momentum of h. This h is constant of Planck and extends over the complete range where General Relativity gives accurate predictions.

Higher scales 2*h, 3*h, 4*h, 5*h are the possible modifications of space in the most extreme cases where Quantum Mechanics can not be ignored. These are called the Hierarchy of Plancks and represent the spin angular momentum of ZPE oscillators in quantum states of higher energy. None of these states have constant h. The states also represent false vacuums of higher scales in Scale Relativity and Squeezed Quantum States. Another way to view the same properties is found in the folding of space into layers described by TGD theory, an essential character of space to make worm holes possible.

Matti Pitkänen might explain the physics differently than my engineering representation. We have never agreed on how to compare his work and mine. He provided missing pieces of technology that allowed completion of my engineering project last year. So I have become involved with TGD in unexpected ways.

Article Topological geometrodynamics

In other threads the effects of extreme speed on machines and people were explored.

Ulla Mattfolk has collaborated with me on the micro physical foundation of biology and possible changes that might occur in higher scales of false vacuums at extreme high speed. Greater stability is suggesting that activation energies increase with scale and reactions chemical and biological slow down affecting response times. Together we developed an argument in support of free will some years ago. Article The body-mind problem as a play between coherence and decoherence

In the present question the stability of isotopes is being considered.

If isotopes of uranium, thorium, and plutonium become progressively more stable as the local false vacuum increases from lower scales to higher scales, then a different operating point on control rods would be expected for each quantum state.

Will Nuclear Power Reactors Operate At Different Control Points In Deep Space At High Speed?