CFD ANALYSIS FOR PRODUCING INPUT PARAMETERS OF NATURAL CIRCULATION FLOW OF A MELCOR ANALYSIS FOR A TI-SGTR ACCIDENT IN THE OPR1000

2021 ◽  
Vol 26 (3) ◽  
pp. 1-10
Author(s):  
H.S. Kang ◽  
S.I. Kim ◽  
K.S. Ha
Keyword(s):  
Natural Circulation ◽  
Cfd Analysis ◽  
Circulation Flow ◽  
Input Parameters

Analysis of the natural circulation flow map uncertainties in an integral small modular reactor

2021 ◽  
Vol 378 ◽  
pp. 111156
Author(s):  
Seyed Ali Hosseini ◽  
Reza Akbari ◽  
Amir Saeed Shirani ◽  
Francesco D'Auria
Keyword(s):  
Natural Circulation ◽  
Circulation Flow ◽  
Small Modular Reactor ◽  
Flow Map

Mixing Process of Two Component Gases by Natural Convection and Molecular Diffusion

2021 ◽  
Author(s):  
Takeaki Ube ◽  
Tetsuaki Takeda
Keyword(s):  
High Temperature ◽  
Natural Convection ◽  
Molecular Diffusion ◽  
Natural Circulation ◽  
Mixing Process ◽  
Circulation Flow ◽  
Experimental Apparatus ◽  
Two Component ◽  
High Temperature Reactor ◽  
Air Ingress

Abstract A depressurization accident involving the rupture of the primary cooling pipe of the Gas Turbine High Temperature Reactor 300 cogeneration (GTHTR300C), which is a very-high-temperature reactor, is a design-based accident. When the primary pipe connected horizontally to the side of the reactor pressure vessel of GTHTR300C ruptures, molecular diffusion and local natural convection facilitate gas mixing, in addition to air ingress by counter flow. Furthermore, it is expected that a natural circulation flow around the furnace will suddenly occur. To improve the safety of GTHTR300C, an experiment was conducted using an experimental apparatus simulating the flow path configuration of GTHTR300C to investigate the mixing process of a two-component gas of helium and air. The experimental apparatus consisted of a coaxial double cylinder and a coaxial horizontal double pipe. Ball valves were connected to a horizontal inner pipe and outer pipe, and the valves were opened to simulate damage to the main pipe. As a result, it was confirmed that a stable air and helium density stratification formed in the experimental apparatus, and then a natural circulation flow was generated around the inside of the reactor.

CFD Analysis of Molten Fluoride Salt Natural Circulation in a Rectangular Loop

2019 ◽  
pp. 431-444
Author(s):  
Rakesh Chouhan ◽  
A. Borgohain ◽  
A. K. Shrivastava ◽  
N. K. Maheshwari ◽  
P. K. Vijayan
Keyword(s):  
Natural Circulation ◽  
Fluoride Salt ◽  
Cfd Analysis ◽  
Molten Fluoride

Backward phenomenon on natural circulation flow based on power differences in FASSIP-01 loop

2018 ◽  
Author(s):  
Mulya Juarsa ◽  
Anhar R. Antariksawan ◽  
Surip Widodo ◽  
M. Hadi Kusuma ◽  
Agus Nur Rohman ◽  
...  
Keyword(s):  
Natural Circulation ◽  
Circulation Flow

Experiment and Numerical Analysis of Control Method of Natural Circulation by Injection of Helium Gas

2013 ◽  
Author(s):  
Naoto Yanagawa ◽  
Masashi Nomura ◽  
Tetsuaki Takeda ◽  
Shumpei Funatani
Keyword(s):  
Numerical Analysis ◽  
Mole Fraction ◽  
Pressure Vessel ◽  
Control Method ◽  
Natural Circulation ◽  
Circulation Flow ◽  
Helium Gas ◽  
Air Ingress ◽  
The One ◽  
Reactor Pressure

This study is to investigate a control method of the natural circulation of the air by the injection of helium gas. A depressurization is the one of the design-basis accidents of a Very High Temperature Reactor (VHTR). When the primary pipe rupture accident occurs in the VHTR, the air is predicted to enter into the reactor pressure vessel from the breach and oxidize in-core graphite structures. Finally, it seems to be probable that the natural circulation flow of the air in the reactor pressure vessel produce continuously. In order to predict or analyze the air ingress phenomenon during the depressurization accident of the VHTR, it is important to develop the method for prevention of air ingress during the accident. In this study, the air ingress process is discussed by comparing the experimental and analytical results of the reverse U-shaped channel which has parallel channels. The experiment of the natural circulation using a circular tube consisted of the reverse U-shaped type has been carried out. The vertical channel is consisted of the one side heated and the other side cooled pipe. The experimental apparatus is filled with the air and one side vertical tube is heated. A very small amount of helium gas is injected from the top of the channel. The velocity and the mole fraction of each gas are also calculated by using heat and mass transfer numerical analysis of multi-component gas. The result shows that the numerical analysis is considered to be well simulated the experiment. The natural circulation of the air has very weak velocity after the injection of helium gas. About 780 seconds later, the natural circulation suddenly produces. The natural circulation flow of the air can be controlled by the method of helium gas injection. The mechanism of the phenomenon is found that mole fraction is changed by the molecular diffusion and the very weak circulation.

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