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Space nuclear systems require large area radiators to reject the unconverted heat to space. System optimizations with Brayton cycles lead to radiators with radiator temperatures in the 400 to 550 K range. To date, nearly all space radiator systems have used aluminum/ammonia heat pipes but these components cannot function at the required temperatures. Titanium-water and Monel-water heat pipes will operate in the temperature range, but titanium and Monel cannot be extruded in the same way as aluminum to form grooved heat pipes for space radiators. A method has been developed to form heat pipes in these materials. Grooves are machined into a flat plate, than the plate is bent and welded to form a heat pipe with grooves. Titanium-water heat pipes with a 1.3 cm OD and a length of roughly one meter have been fabricated with 3 different groove designs. The heat pipes carried 300-400 W at temperatures of …