Yea Yucca mountain is a sad tale. A lack of community engagement and politics ruined what was other wise a geotechnically sound design. Having a national repository for a nation as large as the US might be impractical in retrospect especially involving interstate rail transport. I think local containment of waste is key to reduce shipping costs and trailing the waste through developed areas. That requires planning a nuclear site near a geological repository which might not be part of design plans.

Also that NM repository I haven’t heard of, will be reading more