are given for an experimental pebble bed reactor and power plant as conceived by the Oak Ridge design team. The reactor is a pebble-bed, high-temperature gas-cooled reactor (HTGR), a new design that is ostensibly safer but that researchers in the U.S. and Germany warn does not eliminate the possibility of a serious accident. The pebble bed reactor is being touted as nearly "accident proof." Pebble bed reactors are a modern reactor design that passively cools. The Pebble Bed Modular Reactor (PBMR), like most new reactor ideas, is a reincarnation of an old reactor idea. 2. The reactor is a pebble-bed, high-temperature gas-cooled reactor (HTGR), a new design that is ostensibly safer but that researchers in the U.S. and Germany warn does not … (Thomas, 1999; Harding, 2004; Hirsch et al., 2005.) The technology for pebble bed modular reactors (PBMR) was originally developed by Professor Rudolf Schulten of Aachen University in Germany in the late 1950s. Researchers advise caution as a commercial-scale nuclear reactor known as HTR-PM prepares to become operational in China. This is a contrast to traditional nuclear reactors, which naturally get hotter and melt down if they aren’t actively cooled – a feature that I’m sure was on the forefront of your mind as you wrote your comment. The main advantages and disadvantages are listed, these being chiefly concerned with the rather unique spherical fuel element. The next proposal for a pebble bed reactor grew directly out of the Hatch reactor, the Rotating Fluidized Bed Reactor for Space Nuclear Propulsion (RBR). The PBMR is a variant of the HTGR. The principal performance and design data etc. PEBBLE BED MODULAR REACTORS (PBMR) Of the more innovative Generation III reactor types, the best known is the Pebble Bed Modular Reactor (PBMR). One small test reactor is operating in China and two modular pebble-bed reactors will shortly start up in China. It uses flammable graphite as a moderator. PBMRs are an example of high-temperature gas-cooled reactor. I know several people involved with the fuel development, so … [1] The PBMR was part of the fourth generation of nuclear reactor design. PBMRs are helium cooled and graphite moderated and intended to be built in small modules. The Pebble Bed Modular Reactor (PBMR) is a particular design of pebble bed reactor under development by South African company PBMR (Pty) Ltd since 1994. The project entails the construction of a demonstration power plant at Koeberg near Cape Town (now postponed indefinitely [1] ) and a fuel plant at Pelindaba near Pretoria . 1. The Wikipedia article - Pebble_bed_reactor#Containment - may be incorrect. It has no containment building. I checked the Idaho site and a report on the calculation of Dancoff factors for a typical pebble has the typical diameter of a TRISO particle at 25 mm. 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