Preliminary Safeguards Assessment for the Pebble-Bed ...

This paper demonstrates a multiphysics solver for pebble-bed reactors, in particular, for Berkeley's pebble-bed -fluoride-salt-cooled high-temperature reactor (PB-FHR) (Mark I design). The FHR is a class of advanced nuclear reactors that combines the robust coated particle fuel form from high-temperature gas-cooled reactors, the direct ...

Heavy Water, Gas and Liquid Metal Cooled Reactors

Pebble Bed HTGR (() 2) Core Height 10.0 m Core Diameter 3.5 m Number of Fuel Pebbles 360,000 Microspheres//FF uel P Pebble 11 11,0000 00 Fuel Pebble Diameter 60 mm Microsphere Diameter ~ 1mm • 400,000 pebbles in core • Online refueling, about 3,000 pebbles handled each day • about 350 discarded daily

A review of pebble flow study for pebble bed high ...

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

NUMERICAL SIMULATION OF TRANSIENT COOLING BY FILM …

This article describes a numerical cooling analysis of pebble bed reactor (PBR) fuel pebbles, after an emergency scenario in which the nucleus disassembly is ma...

Some Movement Mechanisms and Characteristics in Pebble Bed ...

The pebblebed-type high temperature gas-cooled reactor is considered to be one of the promising solutions for generation IV advanced reactors, and the two-region arranged reactor core can enhance its advantages by flattening neutron flux. However, this application is held back by the existence of mixing zone between central and peripheral regions, which results from pebbles’ …

Thermal hydraulic analysis of a pebble-bed modular high ...

Along with the further ongoing design procedures of a large demonstration power plant of Chinese 200 MWe high temperature gas-cooled reactor pebble-bed module (HTR-PM), three-dimensional (3-D) analysis is necessary for studying the reactor characteristics under some special unsymmetrical conditions.Compared with the well established two-dimensional thermal-hydraulics …

Pebble-bed reactor - Wikipedia

The pebble-bed reactor (PBR) is a design for a graphite-moderated, gas-cooled nuclear reactor.It is a type of very-high-temperature reactor (VHTR), one of the six classes of nuclear reactors in the Generation IV initiative.The basic design of pebble-bed reactors features spherical fuel elements called pebbles. These tennis ball-sized pebbles (approx. 6.7 cm or 2.6 in in diameter) are made of ...

Pebble bed modular reactor—the first Generation IV …

a helium-cooled core utilising carbon-based fuel. The pebble bed modular reactor (PBMR), being developed in South Africa through a worldwide international collaborative effort led by Eskom, the national utility, will represent a key milestone on the way to achievement of the VHTR design objectives, but in the much nearer term.

China's high temperature reactor - pebble bed modular (HTR ...

As the world's first pebble-bed modular high-temperature gas-cooled reactor, the demonstration project used more than 2,000 sets of equipment for the first time, and more than 600 sets of innovative equipment, including the world's first high-temperature gas-cooled reactor spiral-coil once-through steam generator.

Pebble-bed reactor - Wikipedia

The pebble-bed reactor ( PBR) is a design for a graphite- moderated, gas-cooled nuclear reactor. It is a type of very-high-temperature reactor (VHTR), one of the six classes of nuclear reactors in the Generation IV initiative . Sketch of a pebble-bed reactor. Graphite pebble for reactor.

THE ANALYSIS OF THE PEBBLE-BED MODULAR REACTOR …

The Pebble Bed Modular Reactor (PBMR) power plant is currently being developed by PBMR (Pty) Ltd in South Africa in association with ESKOM and other industrial partners. This high temperature gas cooled reactor (HTGR) plant is based on a three-shaft Brayton cycle with helium gas as coolant. This is a

Shidao Bay Nuclear Power Plant, Shangdong, China

The high-temperature reactor pebble-bed module (HTR-PM) is a new generation modular high-temperature gas-cooled reactor (HTGR) with an outer diameter of 3m and a height of 11m. The reactor has inherent safety with fourth-generation safety features. China holds intellectual property rights for the HTGR technology.

Neutronic design of a Liquid Salt-cooled Pebble Bed ...

@article{osti_22039500, title = {Neutronic design of a Liquid Salt-cooled Pebble Bed Reactor (LSPBR)}, author = {De Zwaan, S J and Boer, B and Lathouwers, D and Kloosterman, J L}, abstractNote = {A renewed interest has been raised for liquid salt cooled nuclear reactors. The excellent heat transfer properties of liquid salt coolants provide several benefits, like lower fuel temperatures ...

THE HELIUM PURIFICATION SYSTEM FOR THE PROPOSED 800 …

The Pebble-Bed Reactor Experiment (PBRE) was designed to advance the pebble-bed concept by providing a test of characteristic features and make contriliutions to the general development of all-ceramic gas-cooled reactors.

Tritium processing systems for the helium cooled pebble ...

The Helium Cooled Pebble Bed (HCPB) is a common type of fusion reactor. An in-depth understanding of the helium flow behaviors in the interstitial void space between pebbles and the influence of ...

Insights of Liquid Cooled Pebble Bed Reactor through ...

Liquid cooled pebble bed reactor (PBR) is the one, being preferred among the six other Generation IV technologies due to its high thermal efficiency. Graphite moderated liquid cooled PBR is a combination of two older technologies, which uses 6 cm diameter TRISO particle as fuel and a molten-salt (generally a combination of different fluoride ...

Design of the Mark-I pebble-bed, fluoride-salt-cooled ...

The University of California, Berkeley (UCB) is developing a pre-conceptual design for a commercial pebble-bed, fluoride-salt-cooled, high-temperature reactor (PB-FHR). The baseline design for this Mark-I PB-FHR plant (Mk1) is a 236-MWth reactor. The Mk1 uses a fluoride salt coolant with solid, coated-particle pebble fuel.

The Pebble Bed Modular Reactor - Institute for Energy and ...

The Pebble Bed Modular Reactor. The Pebble Bed Modular Reactor (PBMR), like most new reactor ideas, is a reincarnation of an old reactor idea. In this case the old idea is the "high temperature gas reactor" or HTGR, that then was proposed in a modular version, known as the MHTGR. The PBMR is a variant of the HTGR.

US3493344A - Revolving pebble bed heat exchanger - Google ...

pebble pebble bed air heated Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US603601A Inventor John C St Clair Original Assignee John C St ...

Very High Temperature Reactor (VHTR)

MHR) Project and the pebble bed and prismatic reactor (PBR and PMR) International Near-Term Deployment projects. Furthermore, the Japanese HTTR and Chinese HTR-10 projects are demonstrating the feasibility of some of the planned VHTR components and materials. (The HTTR is expected to reach a maximum coolant outlet temperature of 950°C in 2003.)

Pebble bed reactors, friction, and cooling -- ANS ...

The pebble bed: Jean Ragusa and Mauricio Eduardo Tano Retamales from the Department of Nuclear Engineering at Texas A&M University have been studying a fourth-generation reactor—the pebble bed reactor—which uses spherical fuel elements (known as pebbles) and a fluid coolant (usually a gas). "There are about 40,000 fuel pebbles in such a reactor," said Ragusa.

Talk:Advanced Gas-cooled Reactor - Wikipedia

Have you looked at the modern Very high temperature reactor and Pebble bed reactor designs? Rwendland 10:36, 9 November 2006 (UTC) BBC radio program on recent AGR problems. FYI BBC Radio 4 program on the recent AGR problems (cracks in graphite and cooling pipes) "File On 4: Nuclear blackout?" can still be listened to on the internet at .

CARDINAL: A LOWER LENGTH-SCALE MULTIPHYSICS SIMULATOR …

This paper demonstrates a multiphysics solver for pebble-bed reactors, in particular, for Berkeley's pebble-bed -fluoride-salt-cooled high-temperature reactor (PB-FHR) (Mark I design). The FHR is a class of advanced nuclear reactors that combines the robust coated particle fuel form from high-temperature gas-cooled reactors, the direct reactor ...

Development of a DEMO Helium Cooled Pebble Bed (HCPB ...

The Helium Cooled Pebble Bed (HCPB) blanket has been selected as one of two European reference concepts for a DEMO nuclear fusion reactor for nearly a decade [1], because HCPB blanket has a reasonable high thermal efficiency, good safety features and compatibility between coolant, structural and functional materials.

The Pebble Bed Modular Reactor - Arizona State University

It's helium cooled reactor comprised of hexagonal fuel elements. A major project in the Chinese National High Technology Program is the HTR-10, 10 MWt, pebble bed reactor at the INET research site, northwest of Beijing, China.

Pebbles Making WavesSouth Africa is Moving Forward with a ...

The pebble bed reactor will be constructed at Koeburg, a site on the Atlantic Coast about 20 miles north of Cape Town, and will run slightly cooler than Schulten's test reactor. The helium-gas coolant will flow at a little more than 900°F and 1,300 pounds per square inch into the reactor assembly.

Preliminary Analysis of the Afterheat Removal in Pebble ...

The pebble bed fluoride salt cooled high temperature reactor (PB-FHR) is an advanced reactor program that adopts coated particle fuel embedded within graphite sphere and molten salt coolant. It benefits from the advantages of the existing HTRs and those of the molten salt reactors (MSRs). The use of passive

THE PEBBLE BED MODULAR REACTOR PROJECT

system with a helium-cooled core utilizing carbon-based fuel. The Pebble Bed Modular Reactor (PBMR) technology, being developed in South Africa through a world wide international collaborative effort led by PBMR (Pty) Ltd, will represent a key milestone on the way to achievement of the VHTR design objectives, but in the much nearer term.

Modular High Temperature Pebble Bed Reactor

Advanced Reactor Technology Pebble Bed Project MPBR-5 Modular High Temperature Pebble Bed Reactor • 110 MWe • Helium Cooled • "Indirect" Cycle • 8 % Enriched Fuel • Built in 2 Years • Factory Built • Site Assembled • On-line Refueling • Modules added to meet demand. • No Reprocessing • High Burnup >90,000 Mwd/MT ...

Pebble-bed Reactor Core Neutronics Design and Fuel Cycle

Oct 22-26, 2012 IAEA Course on High temperature Gas Cooled Reactor Technology 23 . Pebble Beds Multi-pass • The pebble bed reactor technology's fuel handling system makes provision for on-line refueling by allowing fuel sphere circulation. • It is limited to certain design constrains such as the requirements of the Burnup Measuring

Thermal Analysis of Pebble-Bed Reactors based on a Tightly ...

In pebble-bed reactor designs, pebble flow and coolant flow interplay with each other by the interaction forces, normally the drag force or buoyancy force. This requires a tightly coupled simulation between pebble flow and coolant flow in order to provide accurate predictions of core dynamics. In realistic