I read that as using UV light to transfer energy to the working fluid, not that the actual nuclear reaction itself would be any different to any other nuclear reactor.
Even when it reads "It would be operated at temperatures of up to 22,000°C where the vast majority of the electromagnetic emissions would be in the hard ultraviolet range." ?
edit: Sigh.. disregard, cf. https://web.archive.org/web/20080109011832/http://www.nuclea...