pebble-bed reactor


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pebble-bed reactor

[′peb·əl ‚bed rē‚ak·tər]
(nucleonics)
A nuclear reactor in which the fuel consists of small spheres or pellets stacked in the core; the reaction rate is controlled by coolant flow and by loading and unloading pellets.
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THERMIX is able to analyse the thermal hydraulic performance of pebble-bed HTGRs under normal operation and accident conditions, including the pebble-bed reactor core as well as the primary loop, the helium blower, and the steam generator.
The pebble-bed reactor consists of thousands of tiny pebbles of uranium fuel encased in graphite spheres, which are the size of tennis balls.
On technology, Indonesia is eyeing several types, including the pebble-bed reactor, an advanced nuclear reactor design that claims a dramatically higher level of safety and efficiency.
Though each design has its fans, the model that seems to excite the most interest--and that the Bush administration's nuclear advisors seem to be considering most closely--is a type of Very High Temperature Reactor called the "pebble-bed reactor." Rather than being assembled into long fuel rods, the nuclear fuel in a pebble-bed reactor is contained in small, tennis ball-sized "pebbles."
Those advocating nuclear power point to the pebble-bed reactor as a less complex, safer, easier model for the future.
And now Bush wants to speed up permission to build new plants, to extend taxpayer coverage to the nuclear industry for nuclear accidents (the public is the industry's major insurance company) that expires in 2002, and to apparently throw public money into research for a controversial nuclear reactor technology (the pebble-bed reactor) that could use the nation's radioactive waste stockpile as fuel.
As one of the potential candidates for the fourth-generation nuclear reactors, the gas-cooled pebble-bed reactor also emphasizes the optimization of radiation protection.
The research was aimed at developing an advanced high-temperature pebble-bed reactor (PBR), using beryllium oxide for the moderator--BeO pebbles, not graphite.
The pebble-bed reactor being developed under this project and in South Africa is a reactor for which such an objective can be reasonably attained by virtue of its low power density and special fuel design."
The study on the modular HTGR is developed in China, including the HTR-10 [4] and HTR-PM [5, 6], which consists of 2 x 250 MWth module pebble-bed reactor with standardization and modularization technology.
The author said his work in connection with Gen IV was in the area of design methods for very high temperature operation, as in the very high temperature helium-cooled pebble-bed reactor in South Africa.
In VSOP code, to simulate the multipass refueling strategy of pebble-bed reactor, the reactor core is divided into different channels along the radial direction and different layers along the axial direction.