References (0) Cited by (30) A review of multiphysics tools and methods to evaluate high temperature pebble bed reactors. 2024, Progress in Nuclear Energy. ... The pebble bed type HTGR is one of the optimized type of HTGR reactors (Jiang, 2019; Locatelli et al., 2013), whose core is composed of a large number of spherical fuel …
The Pebble Bed - Advanced High Temperature Reactor (PB-AHTR) is a liquid-salt cooled reactor that uses conventional TRISO fuel. Due to the high thermal inertia of the liquid salt coolant, the PB-AHTR allows for a much higher power-density core than traditional gas-cooled high temperature reactors. High power density has a favorable economic impact. …
The pebble-bed high-temperature gas-cooled reactor (HTGR) is an advanced nuclear system with inherent safety. The nuclear reactor is operated in high-temperature ranges and its design temperature limit is 1600 °C. It is important to discuss the conduction–radiation heat transfer in the nuclear pebble bed during the thermal hydraulics analysis. Until …
This paper reviews the recent three-year progress on the investigations of pebble bed flows in nuclear engineering. Both the application of pebble beds in the fission reactors and the fusion reactors are included. The fundamental characteristics of packing, flows, conduction, convection, radiation, and the effective thermal conductivity of pebble …
AbstractThe design of a fusion reactor blanket based on a bed of lithium-containing ceramic pebbles or a mixture of ceramic and metallic pebbles requires knowledge of the effective thermal conductivity of such beds. Binary mixtures of spheres with the same diameter but different conductivities as well as beds formed by one type …
For the heat transfer of pebble or granular beds (e.g., high temperature gas-cooled reactors (HTGR)), the particle thermal radiation is an important part. Using the subcell radiation model (SCM), which is a generic theoretical approach to predict effective thermal conductivity (ETC) of particle radiation, particle-scale investigation of the nuclear …
DOI: 10.1016/J.NUCENGDES.2021.111106 Corpus ID: 233579248; An explicit expression of empirical parameter in ZBS model for predicting pebble bed effective thermal conductivity @article{Bu2021AnEE, title={An explicit expression of empirical parameter in ZBS model for predicting pebble bed effective thermal conductivity}, author={Shanshan …
Section snippets Flow configuration. The flow configuration used for the present assessment is a defined arrangement of spherical type pebbles. Following the specification of the Pebble Bed Modular Reactor (PBMR)-250MWth design, the diameter of a pebble is kept 60 mm (Lee and Lee, 2008, Lee and Lee, 2010).In reality, the core of …
The premise of the work presented here is to use a common analytical tool, Computational Fluid Dynamics (CFD) code, along with different turbulence models. The state-of-the-art turbulence model Large Eddy Simulation (LES) as well as Eddy viscosity models were used to study the flow past bluff bodies. A suitable and commercially available CFD code …
The pebble bed high temperature gas-cooled reactor is a promising generation-IV reactor, which uses large fuel pebbles and helium gas as coolant. The pebble bed flow is a fundamental issue for both academic investigation and engineering application, e.g., reactor core design and safety analysis. This work performed a review of recent progress on …
Pebble‐bed HTR utilizes the configuration of randomly distributed graphite and fuel pebbles which contain randomly dispersed TRISO particles, causing the double heterogeneity effect and making simulation get complicated. To establish a high‐fidelity whole core model of the annular core pebble‐bed HTR, this article proposes a two‐step …
DOI: 10.1016/j.ces.2023.119029 Corpus ID: 259607629; Rapid analysis of packed pebble beds for thermal–hydraulic characteristics via reduced order models @article{Yu2023RapidAO, title={Rapid analysis of packed pebble beds for thermal–hydraulic characteristics via reduced order models}, author={Shuwen Yu and …
This study presents a comprehensive analysis of the flow behavior in packed pebble-bed reactors using computational fluid dynamics (CFD) simulations. The pebble-bed geometry corresponds to an experimental facility located at the Texas A&M Thermal-Hydraulics Research Laboratory. The unsteady Reynolds-averaged Navier–Stokes …
A pebble bed configuration with a dimension size of 8 8 8 mm 3 was achieved by the DEM method in EDEM (Version 2022, Altair Engineering. Inc, USA). 846 pebbles with a predefined pebble size distribution from 0.6 to 1.2 mm were generated randomly to fill the pebble bed with a packing fraction of 65 % (Fig. 2 a and b).A Gyroid block …
Hyper-fidelity (HxF) depletion of pebble bed reactors (PBRs) is the capability to model depletion for every pebble while accounting for motion through the core. Previous HxF work demonstrated ...
The pebble bed reactor was among the first of the Generation IV reactors to implement the latest safety features. Originating from the German HTR (High temperature reactors), …
The pebble bed is one type of the core of the high temperature gas-cooled reactor (HTGR), which is regarded as the candidate of the generation IV advanced reactor. ... References. Abdulmohsin and Al-Dahhan, 2016. R.S. Abdulmohsin, M.H. Al-Dahhan. Axial dispersion and mixing phenomena of the gas phase in a packed pebble-bed …
The Pebble Bed Reactor (PBR) is a 4th generation nuclear reactor which is conceptually similar to moving bed reactors used in the chemical and petrochemical industries. In a PBR core, nuclear fuel in the form of pebbles moves slowly under the influence of gravity. Due to the dynamic nature of the core, a thorough understanding about slow and dense …
Pebble‐bed HTR utilizes the configuration of randomly distributed graphite and fuel pebbles which contain randomly dispersed TRISO particles, causing the double heterogeneity effect and making…
The Mk1 PB-FHR. The Mark 1 Pebble-Bed FHR (Mk1 PB-FHR) pre-conceptual design is the latest in a series of studies to explore potential designs for fluoride salt cooled, high temperature reactors. The Mk1 …
A pebble-bed higherature gas-cooled reactor (pebble-bed HTR) uses a helium coolant, graphite core structure, and spherical fuel elements. The pebble-bed design enables on-line refueling, avoiding ...
DOI: 10.1016/J.FUSENGDES.2017.02.044 Corpus ID: 125775424; Cyclic loading tests on ceramic breeder pebble bed by discrete element modeling @article{Zhang2017CyclicLT, title={Cyclic loading tests on ceramic breeder pebble bed by discrete element modeling}, author={Hao Zhang and Haibing Guo and Tao Shi and Minyou Ye and Hongwen Huang …
Abstract. The development of fluoride-cooled high-temperature reactors has drastically increased the demand for an in-depth understanding of the heat transfer (HT) in packed beds cooled by liquid salts. The complex flow fields and space-dependent porosity found in a pebble bed require a detailed understanding to ensure the proper cooling of …
DOI: 10.1016/J.NUCENGDES.2011.10.054 Corpus ID: 108443848; Optimization of a pebble bed configuration for quasi-direct numerical simulation @article{Shams2012OptimizationOA, title={Optimization of a pebble bed configuration for quasi-direct numerical simulation}, author={Afaque Shams and Ferry Roelofs and E. M. …
The PBMR-400 is a modular thermal reactor with helium coolant and graphite moderator. It utilizes 9.6% enriched uranium dioxide fuel encapsulated with four shells of pyrolitic …
Abstract Knowledge and proper safety analyses of the gas coolant and heat transport mechanism in the dynamic core of packed pebble bed nuclear reactors pose challenges to the reliable design and efficient operation of these reactors. Therefore, this paper carefully reviews most of the gas coolant mixing and heat transport studies …
This code has been named HTROGEN. It can solve the burn up equations for 1156 nuclides including such transmu tations as. a) a)-, (n, y)-, (n, p)-, (n, 2n)-. and. (n, 3n} …
Three reactor types can be designed with pebbles (carbon spheres) as the reactor core: the pebble-bed high-temperature gas-cooled reactor (PB-HTGR), the …
Cardinal, the tool developed here, is the COE tool for lower-length-scale simulation for pebble beds. This new platform tightly couples all three physics and leverages advances in MOOSE (Citation Refs. 16 and Citation 17) such as the MultiApp system, and the concept of MOOSE-Wrapped-App Citation 18 (MWA).Moreover, it is …
Pebble beds have been employed in thermal storage and energy systems, where they are typically used to promote heat exchange in high-temperature environments. Understanding the heat conduction of the entire pebble bed could aid in the material selection of the pebbles themselves and structural components, system design, and …
