Design study of small long life Pressurized Water Reactor(PWR) has been performed. The goal of this study is to get long life reactor core with low excessreactivity, wide safety margin and proliferation resistance characteristics. In order to analyze the systemdesign and its effect, neutronic and thermal hydraulic analysis was performed. The usage of annular fuelconfiguration at PWR system resulting significant reduction of maximum fuel pin temperature and thiswill improve reactor safety margin. A program code developed to analyze influence usage of annular fuelto thermal hydraulic parameter. Parametric survey performed to fuel pin configuration in order to knowthe characteristics of thermal parameter and determine best fuel configuration.Keywords: thorium-uranium oxide, annular fuel, thermal hydraulic, pressure drop, temperaturedistribution, fuel configuration, pitch, fuel fraction.Dwi Irwanto dan Zaki Su’ud*; * Departemen Fisika, Institut Teknologi Bandung, Email : dwi_irwanto@yahoo.com ; szaki@fi.itb.ac.id
