https://re.public.polimi.it/bitstream/11311/1009642/1/Experimental%20study%20on%20steam%20chugging%20phenomenon%20in%20a%20vertical%20sparger.pdf

Experimental study on steam chugging phenomenon in a vertical sparger

Investigation on steam contact condensation injected vertically at low mass flux: Part I pure steam experiment

Research and development in nuclear reactor physics and thermal-hydraulics continue to be vital parts of nuclear science and technology in Japan. The Fukushima accident not only brought tremendous change in public attitudes towards nuclear engineering and technology, but also had huge influence towards the research and development culture of scientific communities in Japan. After the Fukushima accident, thorough accident reviews were completed by independent committees, namely, Tokyo Electric Power Company (TEPCO), the Japanese government, the Diet of Japan, the Rebuild Japan Initiative Foundation, and the Nuclear and Industrial Safety Agency. Reactor physics and thermal-hydraulics divisions of Atomic Energy Society of Japan (AESJ) also issued the roadmaps after the accident. As a result, lessons learned from the accident were made clear, and a number of new research activities were initiated. The present paper reviews ongoing nuclear engineering research activities in Japanese institutes, univers...

Research activities on nuclear reactor physics and thermal-hydraulics in Japan after Fukushima-Daiichi accident

Generalization of experimental data on amplitude and frequency of oscillations induced by steam injection into a subcooled pool

Thermal stratification in a scaled-down suppression pool of the Fukushima Daiichi nuclear power plants

Dimensional analysis of thermal stratification in a suppression pool

Relationship between thermal stratification and flow patterns in steam-quenching suppression pool

Experimental and numerical studies into thermal stratification by direct steam condensation in a torus type suppression pool were carried out to investigate the reactor core isolation cooling in the accidents of Fukushima Daiichi nuclear power plants. The suppression pool was manufactured to be a 1/22 scaled model of a Fukushima Daiichi nuclear power plant. Two different types of spargers were employed to simulate different units of the plants. In a sparger, 132 holes were uniformly drilled on the side of a pipe. However, the other sparger injected steam to the bottom. Flow rate was varied in a wide range to examine the effect on thermal stratification in the suppression pool. The experimental results showed that the sparger type influenced formation of thermal stratification. Moreover, steam flow rate strongly affected the onset time of thermal stratification, and the disappearance of the thermal stratification was affected by subcooling temperature. Computer simulation using a commercial software was conducted and the results show similar temperature profiles to the experimental results. Steam condensation was visualized in a vicinity of the spargers using high speed camera.Copyright © 2014 by ASME

Daehun Song

Papers

Dimensional analysis of thermal stratification in a suppression pool

Thermal stratification in a scaled-down suppression pool of the Fukushima Daiichi nuclear power plants

Relationship between thermal stratification and flow patterns in steam-quenching suppression pool

Experimental Investigation Into Thermal Stratification by Direct Condensation in a Scaled Suppression Pool of Fukushima Daiichi Nuclear Power Plant