Queen Mary College had one in London https://en.wikipedia.org/wiki/History_of_Queen_Mary_University_of_London#Nuclear_reactor https://en.wikipedia.org/wiki/Hist

Queen Mary College had one in London https://en.wikipedia.org/wiki/History_of_Queen_Mary_University_of_London#Nuclear_reactor https://en.wikipedia.org/wiki/History_of_Queen_Mary_Universi... , as did Greenwich Naval College https://en.wikipedia.org/wiki/JASON_reactor https://en.wikipedia.org/wiki/JASON_reactor. Surprisingly common in Universities.