The laws of physics have not changed ~ the “fissionable” material does degrade ~ which is why we call it “fissionable” and why it has half-lives.
“The laws of physics have not changed ~ the fissionable material does degrade ~ which is why we call it fissionable and why it has half-lives.”
Yes and the half life is about 10,000 years. We have such a solid state system we don’t have to worry too much. The only way it would be degrading is if it was leaking and we have sensors that monitor for it.