Gas-cooled Fast Reactor is a good candidate for fourth generation nuclear power plant that projected to be used started in 2030. In this study, modified CANDLE burn-up strategy is adopted to create 300 MWt long life Gas-cooled Fast Reactor with metallic fuel U-10wt%Zr without enrichment. This design demonstrated excellent performance with the average discharge burn-up is about 25.9% HM.
In this study gas cooled reactor system are combined with modified CANDLE burn-up scheme to create small long life fast reactors with natural circulation as fuel cycle input. Such system can utilize natural Uranium resources efficiently without the necessity of enrichment plant or reprocessing plant. Therefore using this type of nuclear power plants optimum nuclear energy utilization including in developing countries can be easily conducted without the problem of nuclear proliferation. In this paper, optimization of Small and Medium Long-life Gas Cooled Fast Reactors with Natural Uranium as Fuel Cycle Input has been performed. The optimization processes include adjustment of fuel region movement scheme, volume fraction adjustment, core dimension, etc. Due to the limitation of thermal hydraulic aspects, the average power density of the proposed design is selected about 75 W/cc. With such condition we investigated small and medium sized cores from 300 MWt to 600 MWt with all being operated for 10 years without refueling and fuel shuffling and just need natural Uranium as fuel cycle input. The average discharge burn-up is about in the range of 23-30% HM.
Hydrological and climatological parameters in several locations on peatlands in South Sumatra have been measured directly by a system called Sensory data transmission Service Assisted by Midori Engineering laboratory (SESAME). The parameters are rainfall, temperature, soil moisture, and groundwater level. This research has studied the groundwater level fluctuations and looks for the correlation between groundwater level and soil moisture in four locations, namely Saleh River 1 (SR1), Saleh River 2 (SR2), Lumpur River 1 (LR1), and Lumpur River 2 (LR2). The results are expected to be useful for fire disaster mitigation on peatlands, especially in South Sumatra. Based on time series data of groundwater level, the results show that there has been a sharp decrease in groundwater level at locations SR1, SR2, and LR1. The statistic calculation results show that groundwater level has a significant correlation with soil moisture in four study sites. The correlation coefficients obtained for SR1, SR2, LR1, and LR2 are r = 0.88, 0.97, 0.87 and 0.92, respectively.
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