A study about sediment thickness mapping was conducted in Serpong Experimental Power Reactor Site. This reactor is planned to be built in a high seismic activity area. Sediment thickness is one of many factors that could affect the site response. A high sediment deposit could amplify and prolong the earthquake waves. This condition could make the reactor building more vulnerable to seismic hazard. The sediment thickness was estimated using the microtremor HVSR method. The parameter used for sediment thickness calculation was obtained from the borehole and cross-hole seismic survey and was tested to ensure that the chosen parameter and the method were accurate. The deviation found in the borehole data was also calculated to determine the accuracy level of the calculation. The current planned location for the reactor is in a relatively low sediment deposit area with 8.8 m of thickness, however there is an area, west of the current location that might be a better location for the reactor based on the result of this study.
Gosong Beach waters are located in Bengkayang Regency West Kalimantan, where the water conditions are influenced by the South China Sea. This study aimed to determine the shape of the bottom morphology profile (bathymetry). The bottom morphology of the water was used as initial data to determine the location of nuclear sites in the study area. Bathymetry measurements were conducted using a single beam echosounder corrected by tidal data to determine the chart datum value, then used to correct sea depth for accuracy. The measurement of tidal data was conducted for 15 days in March 2021 with an interval of 1 hour. The results showed that the type of tidal obtained was mixed tide mixed with the double daily slope with Formzhal (F) value 0.77. The depth of the waters at the study site ranges from 0.9 to 8.45 meters. The average value of the coastal slope shows that spatially there are variations in the slope class with the percentage value ranging from 0.13 to 2.29% which is included in the classification of flat coastal slopes.
Karakteristik gerakan tanah akibat gempabumi dipengaruhi oleh variasi nilai kecepatan gelombang geser (Vs). Ketersediaan nilai Vs suatu daerah belum tentu lengkap dan siap, hal ini disebabkan oleh penyelidikan langsung guna memperoleh nilai Vs memerlukan waktu relatif lama dan biaya yang tidak sedikit. Selain itu juga dipengaruhi oleh tingkat keterjangkauan suatu daerah pengujian. Berbeda halnya dengan data jumlah pukulan (N) dari uji Standard Penetration Test (NSPT) yang lebih banyak tersedia. Dewasa ini telah banyak dilakukan penelitian persamaan korelasi nilai Vs dari data NSPT, meskipun demikian tingkat keandalan antara satu dengan lainnya tidaklah sama. Studi ini bertujuan mengembangkan korelasi yang reliabel antara Vs dan NSPT untuk kategori semua jenis tanah. Metode yang digunakan adalah dengan mengumpulkan dan menganalisis data hasil pengujian geofisika dan geoteknik kemudian melakukan analisis regresi non-linear. Dari hasil perhitungan diperoleh korelasi Vs = 98,759NSPT0,3101 untuk kategori semua jenis tanah di area pulau nuklir Tapak RDE, Serpong. Korelasi ini mampu memprediksi Vs dengan cukup baik dan cepat, tanpa harus melakukan pengukuran yang memerlukan biaya lebih banyak dan waktu lebih lama.
Experimental Power Reactor (RDE) is a Gen IV Reactor type with Hydrogen Gas Cooler. Despite this type of reactor has high safety performance, earthquake hazard should be demonstrated. Detail Engineering Design Activity on RDE has been conducted in the past 3 years. In the end of this phase, preliminary parameter design such as shear wave velocity (Vs) should be defined. This parameter correlated with subsurface condition which has high uncertainty. This study is conducted in order to estimate values of Vs. Generally, the data collection is carried out through geotechnical investigation but this method cost more time and resources. In the recent decades, another method has been widely introduced which is geophysical passive source Microtremor Array Measurement (MAM) with Spatial Auto Correlation (SPAC) method. This method can be used to estimate values of Vs and can be used as preliminary reference to define the position of borehole before construction phase getting started. The result shows, the location of reactor building is estimated to have 5 soil layers with varying Vs value. The Vs value of the first soil layer is about 152 m/s started from the surface to 8 m depth. The second soil layer has 169 m/s Vs value started from 8 m to 20 m depth. The third soil layer, started from 20 m to 36 m depth, has 384 m/s Vs value. The next layer as the fourth layer of soil, started from 36 m to 70 m depth with a value of Vs around 526 m/s. The last soil layer with a depth 70 m to 100 m, has Vs value of 667 m/s. Based on these Vs value estimation from surface to 30 m depth, the average value of the shear wave velocity (Vs 30) is m/s. Thus, reactor building is located in the site class SD with medium soil categories according to SNI 1726-2012. The foundation design and excavation planning phase, this information is needed.
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