Study of the cooling characteristics of the water cooling panel system. Pressure vessel without stand pipes

Experimental works using the test apparatus of water cooling panel system of Modular High Temperature Gas cooled Reactor were performed to acquire the experimental data of cooling performance and temperature distribution of the components. And also the analytical works were carried out to analyze the experimental data acquired from the three cases of the vacuum, helium gas at 0.73MPa and nitrogen gas at 1.1MPa in the pressure vessel, to verify the validity of two-dimensional analytical code -THANPACST2- to investigate the cooling performance of the water cooling panel system. Conclusions are summarized as follows, (1) In the condition of nitrogen gas, in which maximum temperature of the pressure vessel is 420degC, analytical results of the temperature of the pressure vessel using the emissivity εp.v=0.80 of the surfaces of the pressure vessel and the cooling panel was estimated within the errors of -18% and +42% compared to the experimental one. The analytical result of heat transferred to the cooling panel was estimated to be 16.4% lower than the experimental result of heat input. (2) It was indicated that natural convection of air in the reactor cavity considerably affected on the temperature distribution of the pressure vessel although only 15-30% of the total heat was transferred by natural convection