With the validated model, the design space for the inductively heated pebble bed concept can be explored using only the electromagnetic model deduced in Section 2.1 by neglecting thermal …
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@article{osti_5289736, title = {Interim report on core physics and fuel cycle analysis of the pebble bed reactor power plant concept}, author = {Vondy, D R}, abstractNote = {Calculations were made to predict the performance of a pebble bed reactor operated in a mode to produce fissile fuel (high conversion or breeding). Both a one pebble design …
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A new pebble bed core concept is introduced whereby the flow direction is not vertical, but horizontal. For the design condition of 600 MW(t), 850°C and 7 MPa, …
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The THERMIX-KONVEK code was used to model the steady state and dynamic thermal behavior of the US pebble bed modular HTR concept and trial calculations for accident conditions were performed. Results of these trial calculations are compared with other predictions by ORNL and by industrial proponents. The basic equations, assumptions, …
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Solid tritium breeding blanket applying pebble bed concept is promising for fusion reactors. Tritium bred in the pebble bed is purged out by inert gas. The flow characteristics of the purge gas ...
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What is a Pebble Bed Reactor? 360,000 pebbles in core; about 3,000 pebbles handled in FHS every day; about 350 pebbles discarded daily; one pebble discharged every 30 seconds; average pebble cycles through …
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Solid tritium breeding blanket applying pebble bed concept is promising for fusion reactors. Tritium bred in the pebble bed is purged out by inert gas. The flow characteristics of the purge gas ...
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Introduction. With the concept of "fourth generation advanced nuclear power system" put forward, the High Temperature Gas-cooled Reactor (HTGR) has received great attention (Hassan and Dominguez-Ontiveros, 2008) and can be divided into two main types: prismatic block reactors and pebble bed reactors.
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Fuel elements in a high-temperature gas-cooled reactor (HTGR) core may be stacked with a hexagonal close-packed (HCP) structure; therefore, analyzing the temperature distribution and heat transfer efficiency in the HCP pebble bed is of great significance to the design and safety of HTGR cores. In this study, the heat transfer …
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1. INTRODUCTION THE Pebble Bed Reactor concept is based on a reactor core of randomly packed spherical elements containing fissile and/or fertile material in the form of an oxide or carbide, the heat of fission being removed by the forced circulation of helium through the permeable bed.
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Abstract. Pebble bed reactors, either gas-cooled or fluoride-cooled, are among the most promising advanced reactor concepts with active development worldwide. The relatively small size of the pebbles and the fact that they are continuously recirculated makes the task of simulating fuel burnup particularly challenging.
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The pebble beds were packed with pebbles of glass spheres of diameter of d1 = 0.0127 m, d2 = 0.0254 m and d3 = 0.05 m in a Plexiglas cylinder with diameter of D = 0.3048 m, with D/d1 = 24, D/d2 ...
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A new pebble bed core concept is introduced whereby the flow direction is not vertical, but horizontal. For the design condition of 600 MW(t), 850 deg. C and 7 MPa, performance is compared for the ...
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The PEBBED pebble bed reactor fuel management code under development at the Idaho National Laboratory is designed for rapid design and analysis of pebble bed high temperature reactors (PBRs). Embedded within the code are the THERMIX-KONVEK thermal fluid solver and the COMBINE-7 spectrum generation code for inline cross …
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–Fuel form –pebble vs. prismatic –Optimum reactor size Licensing / Technology / Economics In this study the following designs were reviewed: –Pebble bed ranging from 30 MWt to 600 MWt –Prismatic designs between 350 MWt and 600 MWt The study showed a 200 MWt pebble bed reactor with online refueling could provide a burnup of 160,000
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The Chinese HTR-PM is a high-temperature gas-cooled pebble-bed generation IV reactor, which is expected to be the first generation IV reactor to enter operation. Work on the demonstration HTR-PM power plant, composed of two reactors (each 250 MWt) driving a single steam turbine (210 MWe), began in December 2012 at …
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reactor core of thermal power 50 MW and core power density 10MW/m3 as an example to describe the concept design of a pebble catcher. PEBBLE BED REACTOR CORE OF THERMAL POWER 50 MW AND ITS PEBBLE CATCHER . Figure 1 shows the layout of a pebble bed reactor core of thermal power 50 MW. It can be seen from the figure that
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The helium-cooled pebble bed (HCPB) blanket is one of the two concepts proposed as a driver blanket for the European Union Demonstration Fusion Power Reactor (EU DEMO). In contrast to past conceptu...
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In principle, the DB pebble bed concept employs themore » Although it has been shown in the previous Fiscal Year (2009) that a PuO2 fueled pebble bed reactor concept is viable, achieving a high fuel burnup, while remaining within safety-imposed prescribed operational limits for fuel temperature, power peaking and temperature reactivity ...
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@article{osti_1214176, title = {High temperature gas-cooled reactor (HTGR) graphite pebble fuel: Review of technologies for reprocessing}, author = {Mcwilliams, A. J.}, abstractNote = {This report reviews literature on reprocessing high temperature gas-cooled reactor graphite fuel components. A basic review of the various fuel components used in …
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investigation of this HTGR concept was initiated at the same time both in the UK, where the DRAGON reactor reached first criticality in 1964 [6], and in Germany with the construction and operation in 1968 of the AVR pebble-bed reactor [7]. Further-more, the Peach Bottom reactor [8], an HTGR using cylindrical fuel elements, was
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A new pebble bed core concept is introduced whereby the flow direction is not vertical, but horizontal. For the design condition of 600 MW(t), 850°C and 7 MPa, performance is compared between the ...
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The proposal for a direct cycle pebble bed reactor designed for South African conditions was formulated. Slabber later joined the South African systems engineering company IST and introduced the concept to IST's Dieter Matzner and to Eskom's David Nicholls. The three founded PBMR (Pty.) Ltd in 1993.
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The PBMR reactor concept evolved from the Interatom HTR-MODUL reactor design (Reutler and Lohnert, 1984), which was a high-temperature, helium-cooled nuclear reactor with fully ceramic spherical fuel elements, using graphite as structural material.The general plant layout of the 400 MW t PBMR design is shown in Fig. 1.The system …
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For the pebble-bed-type HTGR, the TRISO particles are dispersed in a graphitic-matrix sphere, which is the basic unit for the reactor core. ... The principle that guides their design concepts is to passively maintain core temperatures below fission product release thresholds under all accident scenarios. This level of fuel performance …
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In principle, the DB pebble bed concept employs themore » Although it has been shown in the previous Fiscal Year (2009) that a PuO2 fueled pebble bed reactor concept is viable, achieving a high fuel burnup, while remaining within safety-imposed prescribed operational limits for fuel temperature, power peaking and temperature reactivity ...
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The AVR pebble bed reactor (46 MWth) was operated 1967–1988 at coolant outlet temperatures up to 990°C. Also because of a lack of other experience the AVR operation is a basis for future HTRs.
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In principle, the DB pebble bed concept employs the same reactor designs as the present low enriched uranium core designs, i.e. the 400 MWth Pebble Bed Modular Reactor (PBMR-400). A Pu and Minor Actinide fueled PBMR-400 design serves as the starting point for a core optimization study. The fuel temperature, power peak, …
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pebble-bed-type HTGR, the TRISO particles are dispersed in a graphitic-matrix sphere, which is the basic unit ... design concept capable of producing very high core outlet temperatures. There are two types of HTGRs: the prismatic block-type and the pebble bed-type reactors. Both types of HTGRs use tristructural isotropic (TRISO)
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The Helium Cooled Pebble Bed (HCPB) Breeding Blanket (BB) is one of the 4 BB concepts being investigated in the EU for their possible implementation in DEMO. During 2014 the former "beer-box" BB concept based on the ITER's HCPB Test Blanket Module suffered several design changes so as to meet the different counteracting nuclear ...
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models. A pebble temperature distribution was computed using a two-region, one-dimensional spherical conduction-convection model and coolant temperatures based on …
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The pebble-bed reactor PBR concept, which originated in Germany in the 1950s, is being revisited by several coun-tries, notably China 5 HTR-10 6 and South Africa 3 PBMR 7, which plan large-scale deployment. In the United …
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purpose of this work is to verify this PtH concept for the application in a Brayton battery and to provide a validated design tool along with suitable materials for energy-efficient HT operation. 1.2. Conceptual Arrangement of the Induction Gas Hater The concept of such an inductively heated pebble bed (PB) gas heater is illustrated in Figure1.
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The pebble-bed concept builds on the high-temperature gas-cooled reactor technology developed in the 1960s in Europe and the United States. Typical of this …
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Dozens of U.S. companies are developing advanced reactor designs that will bring enhanced safety, efficiency, and economics to the nuclear energy industry. X-energy, located just outside the nation's …
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The concept of such an inductively heated pebble bed (PB) gas heater is illustrated in Figure 1. It comprises a PB located inside of an insulated inducti on heating coil.
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