Uh, what about the THTR-300 that operated at 300MW capacity from 1987 to 1989?

https://en.m.wikipedia.org/wiki/THTR-300

It was a total failure, though. Not quite Chernobyl, but it was plagued by incidents.

It's a raspberry pi, the operating system microsd will be long dead before any of the data is corrupted. ;-)

(And probably before you'll ever need this thing.)