9 research outputs found
Application Effect of Region Temperature Coefficients and Improvement of Heat Transfer Analysis Model in HTGR
Comparison on Safety Features among HTGR’s Reactor Cavity Cooling Systems (RCCSs)
Reactor cavity cooling systems (RCCSs) comprising passive safety features use the atmosphere as a coolant, which cannot be lost. However, their drawback is that they are easily affected by atmospheric disturbances. To realize the commercial application of the two types of passive RCCSs, namely RCCSs based on atmospheric radiation and atmospheric natural circulation, their safety must be evaluated, that is, they must be able to remove heat from the reactor pressure vessel (RPV) surface at all times and under any condition other than under normal operating conditions. These include both expected and unexpected natural phenomena and accidents. Moreover, they must be able to eliminate the heat leakage emitted from the RPV surface during normal operation. However, utilizing all of the heat emitted from the RPV surface increases the degree of waste heat utilization. This study aims to understand the characteristics and degree of passive safety features for heat removal by comparing RCCSs based on atmospheric radiation and atmospheric natural circulation under the same conditions. It was concluded that the proposed RCCS based on atmospheric radiation has an advantage in that the temperature of the RPV could be stably maintained against disturbances in the ambient air
Core Dynamics Analysis for Reactivity Insertion and Loss of Coolant Flow Tests Using the High Temperature Engineering Test Reactor
Improvement of Analysis Technology for High Temperature Gas-Cooled Reactor by Using Data Obtained in High Temperature Engineering Test Reactor
Study of Heat Transfer of Helium II in Capillary Tubes
The flow of superfluid helium through a tube with different temperatures at the ends differs considerably from that of a Newtonian fluid. The strong dependence of the thermodynamic properties on temperature, the internal convection mechanism and the structure of superfluid turbulence cause unusual flows. The equations for the flow of He II are integrated using a one-dimensional, two-fluid model to study the flow in a tube of small diameter. Variable properties of He II and energy dissipation due to mutual friction are fully taken into consideration. The occurrence of maxima of pressure and temperature suggests that the interpretation of some of the experimental data in the literature should be reconsidered
極細管における超流動ヘリウムの流動伝熱特性に関する研究
The flow of superfluid helium through a tube with different temperatures at the ends differs considerably from that of a Newtonian fluid. The strong dependence of the thermodynamic properties on temperature, the internal convection mechanism and the structure of superfluid turbulence cause unusual flows. The equations for the flow of He II are integrated using a one-dimensional, two-fluid model to study the flow in a tube of small diameter. Variable properties of He II and energy dissipation due to mutual friction are fully taken into consideration. The occurrence of maxima of pressure and temperature suggests that the interpretation of some of the experimental data in the literature should be reconsidered
Reasoning of abstract motion of a target object through task order with natural language — pre-knowledge of object-handling-task programming for a service robot
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