Pebble bed reactors are a modern reactor design that passively cools. 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. 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. PBMRs are an example of high-temperature gas-cooled reactor. 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 … are given for an experimental pebble bed reactor and power plant as conceived by the Oak Ridge design team. Multiple single-size pebble-bed helium-cooled reactors have been built. Their commentary, publishing August 23 in the … [1] The PBMR was part of the fourth generation of nuclear reactor design. 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. Researchers advise caution as a commercial-scale nuclear reactor known as HTR-PM prepares to become operational in China. It uses flammable graphite as a moderator. PBMRs are helium cooled and graphite moderated and intended to be built in small modules. 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). 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. 1. 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. It is being hailed as the savior of the nuclear industry. 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 . 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 Modular Reactor (PBMR), like most new reactor ideas, is a reincarnation of an old reactor idea. The PBMR is a variant of the HTGR. The main advantages and disadvantages are listed, these being chiefly concerned with the rather unique spherical fuel element. 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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