I know several people involved with the fuel development, so … are given for an experimental pebble bed reactor and power plant as conceived by the Oak Ridge design team. PBMRs are helium cooled and graphite moderated and intended to be built in small modules. It is being hailed as the savior of the nuclear industry. (Thomas, 1999; Harding, 2004; Hirsch et al., 2005.) The pebble bed reactor is being touted as nearly "accident proof." It uses flammable graphite as a moderator. Three Mile Island Alert opposes this reactor design because of its inherent dangerous safety defects. The Wikipedia article - Pebble_bed_reactor#Containment - may be incorrect. One small test reactor is operating in China and two modular pebble-bed reactors will shortly start up 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. 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 PBMR was part of the fourth generation of nuclear reactor design. Multiple single-size pebble-bed helium-cooled reactors have been built. 2. The Pebble Bed Modular Reactor (PBMR), like most new reactor ideas, is a reincarnation of an old reactor idea. 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. 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 next proposal for a pebble bed reactor grew directly out of the Hatch reactor, the Rotating Fluidized Bed Reactor for Space Nuclear Propulsion (RBR). Pebble bed reactors are a modern reactor design that passively cools. PBMRs are an example of high-temperature gas-cooled reactor. The main advantages and disadvantages are listed, these being chiefly concerned with the rather unique spherical fuel element. The technology for pebble bed modular reactors (PBMR) was originally developed by Professor Rudolf Schulten of Aachen University in Germany in the late 1950s. The principal performance and design data etc. It has no containment building. The PBMR is a variant of the HTGR. 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. 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 eliminate the possibility of a serious accident. 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