scholarly journals Explicit Modeling of Pebble Temperature in the Porous-medium Framework for Pebble-bed Reactors Applications

2021 ◽  
Author(s):  
Ling Zou ◽  
Dan O'Grady ◽  
Guojun Hu ◽  
Rui Hu
Keyword(s):  
Porous Medium ◽  
Pebble Bed ◽  
Pebble Bed Reactors

A dynamic homogenization model for pebble bed reactors

2015 ◽  
Vol 52 (7-8) ◽  
pp. 932-944 ◽  
Author(s):  
Maurice Grimod ◽  
Richard Sanchez ◽  
Frédéric Damian
Keyword(s):  
Pebble Bed ◽  
Pebble Bed Reactors ◽  
Homogenization Model

scholarly journals Evaluation of radiation heat transfer in porous medial: Application for a pebble bed modular reactor cooled by CO2 gas

2013 ◽  
Vol 28 (2) ◽  
pp. 118-127
Author(s):  
Kamel Sidi-Ali ◽  
Khaled Oukil ◽  
Tinhinane Hassani ◽  
Yasmina Amri ◽  
Abdelmoumane Alem
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Free Convection ◽  
Radiation Heat Transfer ◽  
Convection Heat Transfer ◽  
Emergency Situation ◽  
System Of Equations ◽  
Radiation Heat ◽  
Pebble Bed ◽  
Free Convection Heat

This work analyses the contribution of radiation heat transfer in the cooling of a pebble bed modular reactor. The mathematical model, developed for a porous medium, is based on a set of equations applied to an annular geometry. Previous major works dealing with the subject have considered the forced convection mode and often did not take into account the radiation heat transfer. In this work, only free convection and radiation heat transfer are considered. This can occur during the removal of residual heat after shutdown or during an emergency situation. In order to derive the governing equations of radiation heat transfer, a steady-state in an isotropic and emissive porous medium (CO2) is considered. The obtained system of equations is written in a dimensionless form and then solved. In order to evaluate the effect of radiation heat transfer on the total heat removed, an analytical method for solving the system of equations is used. The results allow quantifying both radiation and free convection heat transfer. For the studied situation, they show that, in a pebble bed modular reactor, more than 70% of heat is removed by radiation heat transfer when CO2 is used as the coolant gas.

scholarly journals Model MC&A for Pebble Bed Reactors

2020 ◽  
Author(s):  
Donald N. Kovacic ◽  
Philip Gibbs ◽  
Logan Scott
Keyword(s):  
Pebble Bed ◽  
Pebble Bed Reactors

In-core fuel management optimization of pebble-bed reactors

2009 ◽  
Vol 36 (8) ◽  
pp. 1049-1058 ◽  
Author(s):  
B. Boer ◽  
J.L. Kloosterman ◽  
D. Lathouwers ◽  
T.H.J.J. van der Hagen
Keyword(s):  
Fuel Management ◽  
Pebble Bed ◽  
Pebble Bed Reactors ◽  
Management Optimization

Spectral zone selection methodology for pebble bed reactors

2011 ◽  
Vol 38 (1) ◽  
pp. 80-87 ◽  
Author(s):  
Ramatsemela Mphahlele ◽  
Abderrafi M. Ougouag ◽  
Kostadin N. Ivanov ◽  
Hans D. Gougar
Keyword(s):  
Pebble Bed ◽  
Pebble Bed Reactors ◽  
Selection Methodology

scholarly journals Physical Analysis of the Initial Core and Running-In Phase for Pebble-Bed Reactor HTR-PM

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Jingyu Zhang ◽  
Fu Li ◽  
Yuliang Sun
Keyword(s):  
Physical Parameters ◽  
Physical Analysis ◽  
Fuel Management ◽  
Fuel Temperature ◽  
Pebble Bed ◽  
Pebble Bed Reactor ◽  
Pebble Bed Reactors ◽  
Management Scheme ◽  
Typical Scheme ◽  
Scheme Evaluation

The pebble-bed reactor HTR-PM is being built in China and is planned to be critical in one or two years. At present, one emphasis of engineering design is to determine the fuel management scheme of the initial core and running-in phase. There are many possible schemes, and many factors need to be considered in the process of scheme evaluation and analysis. Based on the experience from the constructed or designed pebble-bed reactors, the fuel enrichment and the ratio of fuel spheres to graphite spheres are important. In this paper, some relevant physical considerations of the initial core and running-in phase of HTR-PM are given. Then a typical scheme of the initial core and running-in phase is proposed and simulated with VSOP code, and some key physical parameters, such as the maximum power per fuel sphere, the maximum fuel temperature, the refueling rate, and the discharge burnup, are calculated. Results of the physical parameters all satisfy the relevant design requirements, which means the proposed scheme is safe and reliable and can provide support for the fuel management of HTR-PM in the future.

Equilibrium Core Composition Search Methodologies for Pebble Bed Reactors

2010 ◽  
Vol 166 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Massimiliano Fratoni ◽  
Ehud Greenspan
Keyword(s):  
Pebble Bed ◽  
Pebble Bed Reactors ◽  
Core Composition

Passive heat removal from the core of small and medium sized pebble bed reactors

1992 ◽  
Vol 136 (1-2) ◽  
pp. 143-148 ◽  
Author(s):  
Kurt Kugeler ◽  
Peter-W. Phlippen ◽  
Peter Schmidtlein ◽  
Rudolf Swatoch
Keyword(s):  
Heat Removal ◽  
Pebble Bed ◽  
Pebble Bed Reactors ◽  
The Core

61. Molded fueled graphite spheres for pebble bed reactors

Carbon ◽  
1968 ◽  
Vol 6 (2) ◽  
pp. 212
Author(s):  
G Spener ◽  
M Hrovat
Keyword(s):  
Pebble Bed ◽  
Pebble Bed Reactors
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