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![Homologous head curve of typical centrifugal pump [17].](publication/336742186/figure/fig1/AS:1086056636125199@1635947488841/Homologous-head-curve-of-typical-centrifugal-pump-17_Q320.jpg)
Passive safety system is the core feature of advanced nuclear power plant (NPP). It is a research hotspot to fulfill the function of passive safety system by improving the NPP natural circulation capacity. Considering that the flow behaviors of stopped pump pose a significant effect on natural circulation, both experimental and computational fluid...
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Citations
... The pump shaft stuck accident in single loop is a type of design basis accident considered in this paper, as a special working condition of circulating pump speed change. Unlike the station blackout accident, there is no idle time when the shaft jamming occurs, and the pump speed immediately becomes zero (Li et al., 2019). For the circulating pump in another intact loop, its speed can be expressed by the following equation: ...
The development of advanced integrated small reactors is one of the most important trends in nuclear engineering nowadays, the NHR200-II reactor proposed by Tsinghua university has also undergone several iterations of improvement. The increased thermal-hydraulic parameters mean that the design-basis accidents need to be reanalyzed, of which three typical scenarios are chosen as benchmarks and simulated with the complete RELAP5-model. The small break loss-of-coolant accident, the pump-shaft-stuck accident and the heat-transfer-tube-rupture in main heat exchanger accident were assessed systematically and showed good agreement with previous research. The characteristics like the transient flow rate at the break, the moment of inertia of circuit pump and the position of the main heat exchanger were examined, different control variables mainly affect the sequence of trigger actions rather than overall thermal-hydraulic parameters. The results demonstrate that the reactor core can be cooled sufficiently throughout all transient conditions and be flooded with coolant.
... Compared with the traditional integral model [3,4], the Computational Fluid Dynamics (CFD) method could provide more accurate simulation results and resolves more detailed fluid dynamic information, especially for the engineering application with complex geometrical configuration. With the development of the computational capability, various CFD codes have been welldeveloped and widely used in the prediction of the heat and mass transfer phenomenon in the large-scale industrial facility, such as FLACS [5], ADREA-HF [3,6], TONUS [7], PHOEN-ICS [8], CFD-ACE [9], CFX [10], Fluent [11,12], Code_Saturne [13,14] and OpenFoam [15]. S. Manogaran [11] and H. Wilkening [9] use the CFD codes Fluent and CFD-ACE to simulate the hydrogen and methane dispersion process in the pipeline system. ...
Power-to-Gas technologies could play an important role in future energy systems, since they make it possible to store surplus electric energy from fluctuating renewable energy sources such as solar and wind. In Power-toGas concepts, the first step towards storage is the production of H 2 by electrolysis, a possible further step is methanation. The Engler-Bunte-Institute, Fuel Technology at Karlsruhe Institute of Technology is conducting research on catalytic methanation in slurry bubble column reactors, which represent a highly load flexible reactor technology. To obtain experimental data at a semi-industrial scale a methanation pilot plant was built and commissioned. The plant is equipped with various safety valves, which may release the hazardous gases H 2 , CO and CH 4 in the chemical reactor into the environment in the unintended case of overpressure, which may lead to a flammable and/or toxic cloud, threatening the safety of the workers and other humans near the plant. In this work, the safety evaluation of the accidental release in the methanation plant is performed using the numerical tool GASFLOW-MPI. Both toxicity and flammability of the hazardous gas cloud are analyzed and discussed. A local-global two-step simulation strategy, including a local computational model and a global computational model, is employed to calculate the hazardous gas dispersion efficiently and accurately. In the first step, a local detailed computational model with fine mesh is used to calculate the release mass flow through the exhaust tube and the complicated shock waves directly without any further assumption model such as the notional nozzle model. In the second step, a large-scale model with the relatively coarse mesh is chosen to efficiently predict the hazardous gas dispersion around the entire methanation plant. Moreover, the performances of two different types of exhaust pipes are compared and discussed, and the recommended exhaust pipe design is provided. The simulation results show that version B of the exhaust tubes is more recommendable from the viewpoint of safety.
