Development of Hydrogen Diffusion GOTHIC Model for MARK-I Containment of Chinshan Nuclear Power Plant

• Main Author: 沈紘毅
• Other Authors: 白寶實
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/01890804345049666669

碩士 === 國立清華大學 === 核子工程與科學研究所 === 100 === Because the consequences of the Fukushima Daiichi incident cause the hydrogen explosion and the collapse of the reactor building. This effect gave sharp memorized picture in men’s memory. The Chinshan Nuclear power plant (CSNPP) has the name BWR/4 type reactor and Mark-I Containment as Fukushima Daiichi. Therefore, this study is focused on the investigation of the hydrogen explosion if the Fukushima accident is assumed be occurred in the Chinshan Nuclear Power Plant. This research has utilized GOTHIC code to establish the hydrogen diffusion analysis model and analyze the hydrogen diffusion and concentration inside containment . In this study, the hydrogen flow rate data offered from Modular Accident Analysis Program (MAAP) was adopted to build up the time varying boundary condition. Because the primary containment of CSNPP is filled with 96% nitrogen, that hydrogen explosion will not be occurred inside the primary containment versus time localization. But it is concerned that hydrogen concentration distribution and accumulation will cause the hydrogen explosion inside the second containment (reactor building). Because the GOTHIC simulation of this case has no actual data to do the comparison, so that a benchmark experiment of GOTHIC code with H2 diffusion and concentration calculation is first performed to assess the ability of GOTHIC code to accurately predict the transport of hydrogen, and this ability of H2 concentration calculations. The GOTHIC simulation results showed the same trend and good consistency with the experiment. Due to the of lack of the information of experimental parameters, we assume some value of temperature and pressure in the analysis by the engineering judgment. Addition, measurements may possess errors, so the simulation results can be treated as a good reference example. Further measurements more, in order to verify the GOTHIC simulation results, CFD code-Fluent is also adopted by this study to analyze with (the same boundary conditions) the same problem and provide another meaning comparison case. The results showed not only the trend is the same but also the values is almost no difference. Therefore, according to the results of comparisons, the GOTHIC simulation results of hydrogen diffusion and concentration accumulation in the Mark-I Containment is applicable and accuracy enough.