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Pebble Bed Modular Reactors Versus Other Generation Technologies Costs And Challenges For South Africa Emily Grubert Academia Edu The pebble bed modular reactor (pbmr) being developed by the south african utility eskom together with international partners is a 400 mwt nuclear reactor that uses the triso (refer to section 1.2) fuel embedded in 6 cm diameter graphite spheres (pebbles) with a projected electricity output of.