The Pebble Bed Modular Reactor (PBMR), like most new reactor ideas, is a reincarnation of an old reactor idea. The principal performance and design data etc. The project entails the construction of a demonstration power plant at Koeberg near Cape Town (now postponed indefinitely  ) and a fuel plant at Pelindaba near Pretoria . The Wikipedia article - Pebble_bed_reactor#Containment - may be incorrect. PEBBLE BED MODULAR REACTORS (PBMR) Of the more innovative Generation III reactor types, the best known is the Pebble Bed Modular Reactor (PBMR). The pebble bed reactor is being touted as nearly "accident proof." 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. It is being hailed as the savior of the nuclear industry. 2. It has no containment building. (Thomas, 1999; Harding, 2004; Hirsch et al., 2005.) Pebble bed reactors are helium-cooled, graphite-moderated reactors in which the fuel is in the form of tennis ball-sized spherical “pebbles” encased in a graphite moderator. 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. Three Mile Island Alert opposes this reactor design because of its inherent dangerous safety defects. The PBMR is a variant of the HTGR. 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). Researchers advise caution as a commercial-scale nuclear reactor known as HTR-PM prepares to become operational in China. 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. are given for an experimental pebble bed reactor and power plant as conceived by the Oak Ridge design team. PBMRs are an example of high-temperature gas-cooled reactor.  The PBMR was part of the fourth generation of nuclear reactor design. I know several people involved with the fuel development, so … One small test reactor is operating in China and two modular pebble-bed reactors will shortly start up in China. 1. Pebble bed reactors are a modern reactor design that passively cools. Their commentary, publishing August 23 in the … 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 … 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. Multiple single-size pebble-bed helium-cooled reactors have been built. PBMRs are helium cooled and graphite moderated and intended to be built in small modules. It uses flammable graphite as a moderator. The technology for pebble bed modular reactors (PBMR) was originally developed by Professor Rudolf Schulten of Aachen University in Germany in the late 1950s. 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 main advantages and disadvantages are listed, these being chiefly concerned with the rather unique spherical fuel element.
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