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Nuclear energy has a large potency to become the backbone of renewable energy in Indonesia, and it is expected to become a significant lifting factor in fulfilling the national electrical energy, furthermore nuclear technology could be grouped into the clean and safe technology. One of Nuclear program in Indonesia is development of Experimental Power Reactor (RDE) in Puspiptek, Serpong. Safety aspect in nuclear reactor technology covering site, construction and technology. One of the important site safety aspect is volcanology aspect, because of a volcanic event is could occur before, during, and after volcanic eruption which has the potency in producing hazard threats. The volcanic aspect assessment is to understanding the characteristics of volcanism and capabilities of volcanic hazards. In the 150 km radius from RDE site, there are six capable volcanoes, which are covering Anak Krakatau, Gede, Salak, Tangkubanparahu, Guntur volcanoes possessing different probability based on the eruption index. This paper focusing on the lahar hazard analysis from Gede and Salak Volcano. Analysis method conducted in this research is probabilistic of lahar. This method is combining of DEM with 9 m/pixel resolution and analysis using LAHARZ software. Even so, the volcano hazard evaluation towards the site is conducted with a hazard potency source from the phenomenon of the Salak and Gede volcanoes which are at a distance respectively of 41 km and 60 km from the RDE site. The Salak and Gede volcanoes are ones type of active volcanoes which show volcanic activity since 1600 until now. The maximum lahar potency using in this analysis are 60 million m3 from Salak Volcano produces a distribution spread of 35.35 km. Meanwhile, the reach of the lahar from Gede Volcano is 37.7 km. Therefore the lahar does not give any impacts to the RDE site.