10% Investment means mini-nuke developer now fully funded and talking to potential overseas customers. : 10% Investment means mini-nuke developer now fully funded and talking to potential overseas customers The State of Qatar is taking an £85 million stake in the Rolls-Royce spin-off developing a new generation of mini-nuclear power stations. The emirate’s sovereign wealth fund has signed a deal with the engineering giant to take a 10 per cent stake in the Rolls-Royce Small Modular Reactor (SMR) business.