I was curious and went looking. This is the closest I found after a quick google search. It refers only to lighting options in the reactor chamber not the hallways and such.

https://www.nsenergybusiness.com/analysis/featurehow-to-choo...

"There are some obvious considerations: all underwater nuclear lights should be crafted from stainless steel with rounded and smooth surfaces for easy decontamination, and have no sharp or jagged edges to reduce the risk of workers tearing safety gloves or clothing. "

I don't know about power stations, but it's a common feature in medical devices.

E.g. keyboards have a flat or nearly-flat surface so they can be easily cleaned by wiping without leaving any germs behind in a groove, or on an edge.

I suppose something similar makes sense in an environment that could produce radioactive dust.

I spent two summers as a cleaner at a pharmaceutical company in my late teens. The "round corners are easier to clean" were a thing there as well, reason I was told was that sharp corners will scrape off some residue from the cleaning cloths when you drag them over the corner.

Your fridge has no sharp corners inside.

You know, I remember seeing this on older pictures, but I tried to come up with an example and couldn't, all recent pictures I could find had regular floor moldings.

It’s definitely true for some hospitals here in the UK.