Study of Convection Heat Transfer in a Very High Temperature Reactor Flow Channel: Numerical and Experimental Results

2016 ◽  
Vol 196 (3) ◽  
pp. 661-673 ◽  
Author(s):  
Francisco I. Valentín ◽  
Narbeh Artoun ◽  
Ryan Anderson ◽  
Masahiro Kawaji ◽  
Donald M. McEligot
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Convection Heat Transfer ◽  
Flow Channel ◽  
Experimental Results ◽  
Convection Heat ◽  
Very High Temperature Reactor ◽  
High Temperature Reactor ◽  
Very High

Experimental Investigation of Reactor Cavity Cooling System (RCCS) for a Very High Temperature Reactor (VHTR)

2010 ◽  
Author(s):  
L. Capone ◽  
C. E. Perez ◽  
Y. Hassan
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Surface Temperature ◽  
Temperature Profile ◽  
Cooling System ◽  
Experimental Facility ◽  
Very High Temperature Reactor ◽  
High Temperature Reactor ◽  
Cavity Cooling ◽  
Very High

The reactor cavity cooling system (RCCS) for a very high temperature reactor (VHTR) represents a very important safety feature for achieving the defense in depth of the plant. An experimental facility was built for testing the heat transfer capability and phenomenology of this last heat sink designed for ensuring the cooling down of structural material of the vessel and of the concrete walls of the vessel cavity. This small scale facility was built using some of the scaling laws in order to resemble the main heat transport features in RCCS configuration. The natural convection phenomena and radiative heat transfer inside the cavity were represented. The experimental facility represents half of the vessel and of the reactor cavity with five stand pipes for cavity cooling using water as cooling fluid. Measurements were performed heating up the vessel surface temperature to an average temperature of 300 °C that is the average value in accident scenarios. Temperature measurements of the vessel surface temperature, the outer pipes surface temperature profile and inlet and outlet temperature of the cooling water were performed. Axial and radial temperature profiles of the air in the cavity were measured using a movable rack of 24 thermocouples. The results demonstrated the natural circulation phenomena. In addition Velocity measurement of the air inside the cavity were performed using particle tracking velocimetry techniques (PTV) determining the flow regime characteristics and the coupling with the temperature profile. The experimental test matrix of various flow rates in the cooling pipes were carried out.

scholarly journals Characterization of 2D-C/C Composite for Application of Very High Temperature Reactor(M & M 2009 Conference)

2010 ◽  
Vol 76 (764) ◽  
pp. 383-385 ◽  
Author(s):  
Taiju SHIBATA ◽  
Junya SUMITA ◽  
Taiyo MAKITA ◽  
Takashi TAKAGI ◽  
Eiji KUNIMOTO ◽  
...  
Keyword(s):  
High Temperature ◽  
Special Issue ◽  
Very High Temperature Reactor ◽  
High Temperature Reactor ◽  
Very High

A Techno-Economic Optimization of the Power Conversion System of a Very High Temperature Reactor

2006 ◽  
Author(s):  
Christine Mansilla ◽  
Michel Dumas ◽  
Franc¸ois Werkoff
Keyword(s):  
High Temperature ◽  
Power Conversion ◽  
Minimum Cost ◽  
Production Costs ◽  
Total Production ◽  
Economic Optimization ◽  
Very High Temperature Reactor ◽  
Conversion System ◽  
High Temperature Reactor ◽  
Very High

Generation IV nuclear reactors will not be implemented unless they enable lower production costs than with the current systems. In such a context a techno-economic optimization method was developed and then applied to the power conversion system of a very high temperature reactor. Techno-economic optimization consists in minimizing an objective function that depends on technical variables and economic ones. The advantage of the techno-economic optimization is that it can take into account both investment costs and operating costs. A techno-economic model was implemented in a specific optimization software named Vizir, which is based on genetic algorithms. The calculation of the thermodynamic cycle is performed by a software named Tugaz. The results are the values of the decision variables that lead to a minimum cost, according to the model. The total production cost is evaluated. The influence of the various variables and constraints is also pointed out.

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