A reactor concept more directly derived from industrial gas cooled reactors, using hexagonal prismatic fuel elements consisting of a graphite matrix containing 45% of BISO particles was found not to be competitive in terms of mass (500 kg penalty for the reactor block). 3.6 Mass Evaluation The various subsystem design studies resulted in the system mass summaries given in Table 2. The total system masses range from 1880 to 2320 kg, the differences between the systems operating at both ends of the heat source temperature range covered by the study (650 to 1125°C) amounting to 440 kg only.
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