Multiple single-size pebble-bed helium-cooled reactors have been built. 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. The principal performance and design data etc. The technology for pebble bed modular reactors (PBMR) was originally developed by Professor Rudolf Schulten of Aachen University in Germany in the late 1950s. 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 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. (Thomas, 1999; Harding, 2004; Hirsch et al., 2005.) It is being hailed as the savior of the nuclear industry. 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 … PBMRs are an example of high-temperature gas-cooled reactor. 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. 2. 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). [1] The PBMR was part of the fourth generation of nuclear reactor design. 1. Researchers advise caution as a commercial-scale nuclear reactor known as HTR-PM prepares to become operational in China. The main advantages and disadvantages are listed, these being chiefly concerned with the rather unique spherical fuel element. 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 . PBMRs are helium cooled and graphite moderated and intended to be built in small modules. 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. I know several people involved with the fuel development, so … It has no containment building. The Wikipedia article - Pebble_bed_reactor#Containment - may be incorrect. 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. are given for an experimental pebble bed reactor and power plant as conceived by the Oak Ridge design team. It uses flammable graphite as a moderator. 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