The 5MW low temperature nuclear heating reactor (NHR-5) is a new and advanced type of nuclear reactor developed by Institute of Nuclear Energy Technology (INET) of Tsinghua University of China in 1989. Its main loop i...The 5MW low temperature nuclear heating reactor (NHR-5) is a new and advanced type of nuclear reactor developed by Institute of Nuclear Energy Technology (INET) of Tsinghua University of China in 1989. Its main loop is a thermal-hydraulic system with natural circulation. This paper studies the safety of NHR under the condition of loss-of-coolant accidents (LOCAs) by means of simulant experiments. First, the background and necessity of the experiments are presented, then the experimental system, including the thermal-hydraulic system and the data collection system, and similarity criteria are introduced. UP to now, the discharge experiments with the residual heating power (20% rated heating power) have been carried out on the experimental system. The system parameters including circulation flow rate, system pressure, system temperature, void fraction, discharge mass and so on have been recorded and analyzed. Based on the results of the experiments, the conclusions are shown as folios: on the whole, the reactor is safe under the condition of LOCAs, but the thermal vacillations resulting from the vibration of the circulation flow rate are disadvantageous to the internal parts of the reactor core.展开更多
The Fourth Nuclear Security Summit—to be held in Washington,D.C.from March31 to April 1—will be of particular importance with regards to the Democratic People’s Republic of Korea’s recent announcement that it will...The Fourth Nuclear Security Summit—to be held in Washington,D.C.from March31 to April 1—will be of particular importance with regards to the Democratic People’s Republic of Korea’s recent announcement that it will conduct a nuclear warhead explosion test and the fifth anniversary of the Fukushima nuclear power plant accident in March.President Xi Jinping will attend the summit and elaborate on the global nuclear security situation and China’s nuclear security concept.展开更多
文摘The 5MW low temperature nuclear heating reactor (NHR-5) is a new and advanced type of nuclear reactor developed by Institute of Nuclear Energy Technology (INET) of Tsinghua University of China in 1989. Its main loop is a thermal-hydraulic system with natural circulation. This paper studies the safety of NHR under the condition of loss-of-coolant accidents (LOCAs) by means of simulant experiments. First, the background and necessity of the experiments are presented, then the experimental system, including the thermal-hydraulic system and the data collection system, and similarity criteria are introduced. UP to now, the discharge experiments with the residual heating power (20% rated heating power) have been carried out on the experimental system. The system parameters including circulation flow rate, system pressure, system temperature, void fraction, discharge mass and so on have been recorded and analyzed. Based on the results of the experiments, the conclusions are shown as folios: on the whole, the reactor is safe under the condition of LOCAs, but the thermal vacillations resulting from the vibration of the circulation flow rate are disadvantageous to the internal parts of the reactor core.
文摘The Fourth Nuclear Security Summit—to be held in Washington,D.C.from March31 to April 1—will be of particular importance with regards to the Democratic People’s Republic of Korea’s recent announcement that it will conduct a nuclear warhead explosion test and the fifth anniversary of the Fukushima nuclear power plant accident in March.President Xi Jinping will attend the summit and elaborate on the global nuclear security situation and China’s nuclear security concept.
