This report presents the results of thermal-hydraulic analysis for the Ultra High Temperature Reactor Experiment (UHTREX) as well as the modular Gas Turbine High Temperature Reactor 300 MWth (HTGR-GT300) loaded with Pebble Type Fuel. A thermal-hydraulic computer code was developed that was named PEBTEMP. In order to compare the present PBR case with UHTREX, a calculation for HTGR-GT300 was carried out in the similar conditions with UHTREX i.e. the inlet coolant temperature of 871°C, system pressure of 3.45 MPa and power density of 1.3 W/cm3. The hot channel factor of 1.0, 1.1, 1.2, and 1.3 are chosen for the present calculation. As the result, the fuel temperature for the present PBR case is extremely low when compared to the UHTREX case. The evaluated temperature is compared to the data of conventional optical high temperature camera using the principle of the thermal radiation flux dependence upon surface temperature. Therefore, the present PBR system design will be named as NUHTREX i.e. New UHTREX. The evaluated temperature is compared to the data of conventional optical high temperature camera using the principle of the thermal radiation flux dependence upon surface temperature.

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