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Indonesian government through the National Atomic Energy Agency has planned to build a nuclear power plant. One of the proposed sitesis in West Bangka Regency, Bangka Belitung Archipelago Province. The engineering geology of this area is, however, not fully understood and requires further investigations. Engineering geology investigations were carried out by assessing the rock mass quality and bearing capacity based on field observation and drilling data. The assessment was conducted using Rock Mass Rating (RMR) and Geological Strength Index (GSI) classifications. The rock masses in the study area were divided into four units, namely units of sandstone, granite, mudstone and pebbly sandstone. The RMR and GSI values in the study area were influenced by the parameters of discontinuity space density, the slope of discontinuity orientation, grade of weathering and groundwater conditions. The assessment shows that the granite unit had the best quality which was shown by a 53 average RMR value and 66 GSI value. Based on the average RMR value, the granite unit was estimated to have cohesion value between 0.2 and 0.3 MPa, friction angle between 25° and 35°, and allowable bearing pressure between 280 and 135 T/m2. Based on the GSI value, the granite unit was estimated to have uniaxial compressive strength value between 1.0465 and 183.8 MPa, ten- sile strength between (-0.0122) and (-5.2625) MPa, rock mass strength values between 24.5244 and 220.351 MPa, and modulus of deformation within a range of 1.73 - 86.68 GPa. The Granite Unit was considered to be the most appropriate location for the nuclear power plants. Keywords: nuclear power plant foundation, Geological Strength Index, Rock Mass Rating, rock mass quality

DETERMINATION OF NUCLEAR POWER PLANT SITE IN WEST BANGKA BASED ON ROCK MASS RATING AND GEOLOGICAL STRENGTH INDEX