—”[Don’t allow regulatory (political) agencies change the rules and don’t include stupid stuff like withstanding an airliner crash]”
This requirement predates 911.
From 2002 but sites work from1968.
Airplane Impact on Nuclear Power plants
https://inis.iaea.org/collection/NCLCollectionStore/_Public/36/071/36071655.pdf
This is "what requirement can I impose so the plant is never built?".
On West Coast Shuttle (at VAFB, CA) they had a requirement to be able to land at V-19 (VAFB landing strip) in zero-zero visibility.
Nobody was going to attempt to land a $Billion spacecraft in those conditions.
We ignored the requirement.