Editing Magnox (section)

===AGR===
{{main|Advanced Gas-cooled Reactor}}
The dual-use nature of the magnox design leads to design compromises that limit its economic performance. As the magnox design was being rolled out, work was already underway on the [[advanced gas-cooled reactor]] (AGR) with the explicit intention of making the system more economical. Primary among the changes was the decision to run the reactor at much higher temperatures, about {{convert|650|C|-1}}, which would greatly improve the efficiency when running the power-extracting [[steam turbine]]s. This was too hot for the magnox alloy, and the AGR originally intended to use a new [[beryllium]]-based cladding, but this proved too brittle. This was replaced by a [[stainless steel]] cladding, but this absorbed enough neutrons to affect criticality, and in turn required the design to operate on slightly [[enriched uranium]] rather than the magnox's natural uranium, driving up fuel costs. Ultimately the economics of the system proved little better than Magnox. Former Treasury Economic Advisor, [[David Henderson (economist)|David Henderson]], described the AGR programme as one of the two most costly British government-sponsored project errors, alongside [[Concorde]].<ref name=nei-20130621>{{cite news |url=http://www.neimagazine.com/opinion/opinionthe-more-things-change/ |title=The more things change... |author=David Henderson |publisher=Nuclear Engineering International |date=21 June 2013 |access-date=2 July 2013}}</ref>