Numerical Study on Multiscale Heat Conduction Problems in Very High Temperature Reactor Fuel Pebble Based on OpenFOAM

Abstract Pebble bed very high temperature reactor (VHTR) has been identified as one of six Generation-IV (Gen-IV) types of reactor which could operate at a high thermal power. The calculation of the temperature in the fuel pebble is a key part of VHTR thermal hydraulics numerical simulation. However, due to the special structure of the VHTR fuel pebble, the temperature calculation involves a multiscale problem. The multiscale heat conduction model includes mesoscale temperature of fuel pebble and microscale temperature of TRISO fuel particles calculation. To deal with the particularity of temperature calculation of the fuel pebble, this paper presents a multiscale heat conduction model based on an open source CFD package OpenFOAM. Firstly, the quasi steady state heat conduction method (QSSHC) and homogeneous layers method (HL) was verified by a simple multiscale model. The results show that the QSSHC method has a good ability of multiscale temperature prediction. Secondly, the mesoscale temperature distribution and the maximum temperature in the microscale of VHTR fuel pebbled are calculated with QSSHC method based on OpenFOAM. This multiscale solver will be couple with other solvers of OpenFOAM, to provide a new perspective of VHTR simulation.

Development and Implementation of a 3D Heat Conduction Model for (Very) High Temperature Reactors Into the Reactor Dynamics Code DYN3D

Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries ◽

10.1115/icone20-power2012-54649 ◽

2012 ◽

Author(s):

Silvio Baier ◽

Ulrich Rohde ◽

Soeren Kliem ◽

Emil Fridman

Keyword(s):

Heat Conduction ◽

High Temperature ◽

Block Type ◽

Conduction Model ◽

Heat Conduction Model ◽

Reactor Dynamics ◽

3D Effects ◽

High Temperature Reactors ◽

Short Time ◽

The reactor dynamics code DYN3D was extended to treat phenomena in Block-type High Temperature Reactors (HTR). Therefor, a new heat conduction model was implemented into the code to tackle 3D effects of heat conduction and heat transfer. The first part of the paper describes the details of the heat conduction model. In the second part results of coupled neutron-kinetics/thermal-hydraulics calculations of steady state and short-time transients in block-type HTRs are discussed.

Formation of Serrated Grain Boundaries and Its Effect on Tensile Properties at 950 ℃ in Alloy 617 for Very High Temperature Reactor

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2014.53.1.1 ◽

2015 ◽

Vol 53 (1) ◽

pp. 1-12 ◽

Cited By ~ 5

Author(s):

Hyun Uk Hong ◽

June Woo Choi ◽

Ji Won Lee ◽

Je Hyun Lee ◽

Dong Jin Kim

Keyword(s):

High Temperature ◽

Grain Boundaries ◽

Tensile Properties ◽

Alloy 617 ◽

Analysis of the hot gas flow in the outlet plenum of the very high temperature reactor using coupled RELAP5-3D system code and a CFD code

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2007.06.008 ◽

2008 ◽

Vol 238 (1) ◽

pp. 274-279 ◽

Cited By ~ 22

Author(s):

Nolan Anderson ◽

Yassin Hassan ◽

Richard Schultz

Keyword(s):

High Temperature ◽

Gas Flow ◽

Hot Gas ◽

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

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.76.383 ◽

2010 ◽

Vol 76 (764) ◽

pp. 383-385 ◽

Cited By ~ 1

Author(s):

Taiju SHIBATA ◽

Junya SUMITA ◽

Taiyo MAKITA ◽

Takashi TAKAGI ◽

Eiji KUNIMOTO ◽

...

Keyword(s):

High Temperature ◽

Special Issue ◽

Effect of trace impurities in helium on the creep behavior of Alloy 617 for very high temperature reactor applications

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2006.12.028 ◽

2007 ◽

Vol 366 (1-2) ◽

pp. 28-36 ◽

Cited By ~ 38

Author(s):

P.S. Shankar ◽

K. Natesan

Keyword(s):

High Temperature ◽

Creep Behavior ◽

Trace Impurities ◽

Alloy 617 ◽

A Study on the Thermal-Hydraulic Characteristics of Molten Salt in Minichannels of an Intermediate Heat Exchanger for a Very High Temperature Reactor (VHTR)

Transactions of the Korean Society of Mechanical Engineers B ◽

10.3795/ksme-b.2010.34.12.1093 ◽

2010 ◽

Vol 34 (12) ◽

pp. 1093-1099

Author(s):

Hui-Seong Jeong ◽

In-Seon Hwang ◽

Kwang-Hyun Bang

Keyword(s):

High Temperature ◽

Heat Exchanger ◽

Molten Salt ◽

Hydraulic Characteristics ◽

Intermediate Heat Exchanger ◽

Multilayer Heat Conduction Model in High Temperature Environment

2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) ◽

10.1109/ei2.2018.8582651 ◽

2018 ◽

Cited By ~ 1

Author(s):

Yuanlin Hu

Keyword(s):

Heat Conduction ◽

High Temperature ◽

Conduction Model ◽

Heat Conduction Model ◽

Temperature Environment ◽

High Temperature Environment

Volume 4: Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition ◽

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

10.1115/icone14-89155 ◽

2006 ◽

Author(s):

Christine Mansilla ◽

Michel Dumas ◽

Franc¸ois Werkoff

Keyword(s):

High Temperature ◽

Power Conversion ◽

Minimum Cost ◽

Production Costs ◽

Total Production ◽

Economic Optimization ◽

Conversion System ◽

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.