Scaling and CFD Analyses for a Single Phase Natural Circulation Loop

2017 ◽  
Author(s):  
Weizhong Zhang ◽  
Qian Lin ◽  
Shengyi Si
Keyword(s):  
Single Phase ◽  
Scaling Laws ◽  
Natural Circulation ◽  
Heat Removal ◽  
Circulation Loop ◽  
Scaling Analysis ◽  
Reduced Models ◽  
Natural Circulation Loop ◽  
Cfd Analyses ◽  
Full Height

Scaling analysis based on scaling laws was performed first for a single-phase natural circulation loop. Two geometrical reduced models were built. Numerical simulations for them using a CFD code named FLUENT were carried out. The calculated heat removal capabilities of the two reduced models show good agreement with the predicted results by the RELAP5/Mod3.2. The reversely deduced heat removal capabilities of the loop prototype from the numerically calculated results agree well with the prediction by the RELAP5/Mod3.2 for full height scaling model.

Non-linear dynamics of single phase rectangular natural circulation loop

2020 ◽  
Vol 130 ◽  
pp. 103530
Author(s):  
Vishal Goyal ◽  
Varun Hassija ◽  
Vikas Pandey ◽  
Suneet Singh
Keyword(s):  
Single Phase ◽  
Natural Circulation ◽  
Circulation Loop ◽  
Linear Dynamics ◽  
Natural Circulation Loop ◽  
Non Linear

Performance of Sodium Natural Circulation Loop for Passvie Decay Heat Removal

2008 ◽  
Author(s):  
Hae-Yong Jeong ◽  
Kwi-Seok Ha ◽  
Won-Pyo Chang ◽  
Yong-Bum Lee ◽  
Dohee Hahn ◽  
...  
Keyword(s):  
Fast Reactor ◽  
System Analysis ◽  
Natural Circulation ◽  
Heat Removal ◽  
Circulation Loop ◽  
Ambient Atmosphere ◽  
Steady State Condition ◽  
Decay Heat ◽  
Natural Circulation Loop ◽  
Test Loop

The Korea Atomic Energy Research Institute (KAERI) is developing a Generation IV sodium-cooled fast reactor design equipped with a passive decay heat removal circuit (PDRC), which is a unique safety system in the design. The performance of the PDRC system is quite important for the safety in a simple system transient and also in an accident condition. In those situations, the heat generated in the core is transported to the ambient atmosphere by natural circulation of the PDRC loop. It is essential to investigate the performance of its heat removal capability through experiments for various operational conditions. Before the main experiments, KAERI is performing numerical studies for an evaluation of the performance of the PDRC system. First, the formation of a stable natural circulation is numerically simulated in a sodium test loop. Further, the performance of its heat removal at a steady state condition and at a transient condition is evaluated with the real design configuration in the KALIMER-600. The MARS-LMR code, which is developed for the system analysis of a liquid metal-cooled fast reactor, is applied to the analysis. In the present study, it is validated that the performance of natural circulation loop is enough to achieve the required passive heat removal for the PDRC. The most optimized modeling methodology is also searched for using various modeling approaches.

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