Abstract
An experiment was carried out to simulate passive decay heat removal from a high-temperature gas-cooled reactor based on water cooling panel system. The experiment is aimed at investigating the temperature distribution of the system and the effectiveness of decay heat removal. The experimental apparatus consists of a pressure vessel of 1 m in diameter and 3 m in height, bristling with nineteen stand pipes atop and containing internal heaters with a maximum heating rate of 100 kW to simulate the decay heat of the core. The pressure vessel is surrounded by the water cooling panels in an air-filled cavity, which resembles the actual reactor installation. The computational code THANPACST2 was benchmarked by the experimental data to verify its numerical methods including a newly-proposed axi-symmetrical model of the three-dimensional structures of the stand pipes by porous body cells. Under the conditions of helium gas pressure of 0.47 MPa and temperatures up to 430°C in the pressure vessel, the temperatures of the critical spots near the top of the pressure vessel, where peak temperatures appeared, were estimated within discrepancies between −25 and +70°C from the experimental data. The heat transferred to the cooling panel was estimated to be 4.1% less than the experimental value.
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