I think we need this in the modern world. It should operate through 30 cm/s, and should be such solid ground that the pgv can't even get that high. It's important that all the ancillary equipment (electricity and such) also meets that standard.
Before I retired, I was on a nuclear CSA group. I wanted to go this route, declaring a pgv for the design, so that the old company could just buy a reactor. Unfortunately, massive self interest prevented this. I never went back.
The new Darlington refurb is ignoring seismic, they are just replacing with the same old junk, from the 40 year old seismic study. This is the exact opposite.