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temperature reactor phoenix emerging from PBMR ashes Early stage research into the possible revival of the Pebble Bed Modular Reactor (PBMR) has yielded a revamped reactor concept that incorporates an entirely new operational philosophy, as well as the use of construction materials and manufacturing techniques that were either not considered or unavailable during the development of the PBMR.
Chief nuclear officer David Nicholls tells Engineering News Online that the work, which has been under way for a year, is being conducted within Eskom existing research and development budget and is being carried out by a handful of internal engineers and louis vuitton anton briefcase scientists, together with louis vuitton shoes kuwait university researchers.Nicholls is not willing to disclose the budget, but reports that Eskom has teamed up with researchers at the North West University, Nelson Mandela Metropolitan University and the University of Cape Town to advance the research effort. In 2017, the group of involved universities will be expanded to include researchers the universities of Stellenbosch, Pretoria, Witwatersrand and Johannesburg.started with a clean sheet of paper with the aim of using the PBMR as a basis for a radically more advanced reactor, Nicholls explains. looked at the temperatures, we looked at the layout and, over the last year, we have developed a conceptual outline, which is substantially simpler, more efficient and cheaper to build than the PBMR. stresses, though, that louis vuitton unisex bracelet the AHTR concept could not be termed a design, describing the current visual representations of the reactor is little more than a the original PBMR, the brief is not the immediate development of a commercial reactor. Instead, the researchers have been asked to incorporate core aspects of the PBMR passively safe reactor design (fuelled by tennis ball sized graphite pebbles containing low enriched uranium oxide particles) to develop a high temperature modular plant, which could be commercialised during the 2030s.The more immediate ambition, though, louis vuitton bracelet gamble azur is to progress the AHTR design to a point whereby a 50 MW plant can be built, possibly during the mid 2020s.The conceptual outline for the AHTR is significantly different from the original PBMR. The layout has been revised; the top to bottom helium gas flow reversed; higher operating temperatures proposed, along with a combined cycle power generation solution; and alternative construction materials (including a concrete rather than a steel pressure vessel) incorporated.could have simply restarted PBMR as it was. But that going back 20 years in design and probably 35 years in technology. What we are saying instead is, can we do better than that? Nicholls explains.A major deviation from the PBMR is the AHTR far higher operating temperatures. Under the current proposal, the helium gas enters the reactor at 570 and exits to a gas turbine, which will deliver about 40% of the electrical output, at 1 200 The temperature of the exhaust gas is 600 which, while still high, can be deployed in a steam cycle, using a molten salt circuit, to deliver the 60% electrical balance.the steam cycle gives the machine an impressive thermal efficiency of 60%, Nicholls enthuses.
The researches have also been asked to draw inspiration from outside of the nuclear industry and seek to incorporate changes in manufacturing techniques, such as Three Dimensional printing, as well as recent advances in material science.is this going to end up? I don know. But our current view is that the first machine will be a proof of concept plant, with the ultimate goal of bringing 150 MW high temperature commercial reactors online in the 2030s.
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