The potential of volcanic hazard for NPP site candidate, case study: Semadum volcano, West Kalimantan

The volcanic hazards aspect is one of the important aspects of the selection step of the Nuclear Power Plant (NPP) site candidates survey. The volcanic hazards survey was carried out with a radius of 150 km from the proposed NPP candidate site, covering surveys of old volcanic products to the recent active volcanoes. One of the youngest volcanoes in the West Kalimantan area is the Semadum volcano located in Pisak Village, Tujuhbelas District, Bengkayang with Pliocene-Pleistocene age, 115 km from the prospective NPP candidate site at Gosong Beach, Sungai Raya District, Bengkayang, West Kalimantan. The purpose of this study was to determine the characteristics and potential hazards of the Semadum volcano regarding the NPP Site Candidate. The methodology used is the interpretation of DEM-SRTM images to determine topographic patterns, followed by geological mapping field activities, sampling of Semadum volcanic rock products, and Petrographic and geochemical analysis using X-Ray Fluorescence (XRF). Mount Semadum is composed of andesite-basalt lava with a vesicular-scoria structure, massive andesite lava, pyroclastic rocks in the form of pyroclastic breccias with andesite fragments (bombs and blocks), lapilli/tuff breccias, and lava domes. Based on geochemistry data, this complex is composed of trachyandesite and dacite rock with calk-alkaline affinity. Based on the nature of magma and the distribution of its products, the Semadum volcano does not have a potential volcanic hazard to the prospective NPP candidate site. (author)