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PBMR—Early history and experience elsewhere

Some high temperature reactors already have operated worldwide (Table 1). The development of helium cooled high temperature reactors started in Great Britain with the DRAGON-project as a project of several European countries. In this reactor a tubular ceramic fuel element was used and coated particle fuel was inserted first. This reactor has been operated successfully from 1966 to 1975 and then the common project of several European countries was concluded for political and financial reasons. Today, the reactor system is in the state of safe enclosure.