Editing Experimental Breeder Reactor I (section)

===Design===
[[File:Experimental Breeder Reactor I Cutaway diagram by Walter Zinn.png|left|thumb|Cutaway diagram of EBR-I, showing the core, inner blanket rods, coolant tank, and outer blanket and control rods.]]
As a breeder reactor, EBR-I used a "[[seed-and-blanket design]]". The core "seed" was [[highly enriched uranium]] at 90% uranium-235. The inner blanket contained rods of [[natural uranium]] at 0.7% uranium-235 content. This structure was surrounded by the double-walled tank containing the [[NaK]] primary coolant. This tank was surrounded by the air-cooled outer blanket of natural uranium, used for its effective [[Neutron reflector|neutron reflecting]] properties, and which also contained the [[Control rod|control rods]]. The outer blanket was the movable component, as technique for moving parts within liquid metal were in early stages. However the air-cooling greatly limited the maximum operating power, which was reached at 1.4 MWth.<ref name="d686" /><ref>{{cite web | url=https://www.asme.org/wwwasmeorg/media/resourcefiles/aboutasme/who%20we%20are/engineering%20history/landmarks/39-experimental-breeder-reactor-i-1951.pdf | title=Experimental Breeder Reactor I | publisher=[[ASME]] | access-date=October 28, 2019}}</ref>

The primary liquid metal coolant flows by gravity from the supply tank through the reactor core, where it absorbs heat. Then, the coolant flows to heat the exchanger, where it gives up this heat to the secondary coolant, another liquid metal. The primary coolant is returned to the supply tank by an electromagnetic pump. The secondary coolant is pumped to the boiler, where it gives up its heat to water, generating steam. This steam passes to the turbine, which is how electricity is produced. This steam then condenses and returned to the boiler by a water pump.<ref>{{Cite web |title=EBR-1 in Photos |url=https://www.ans.org/news/article-2096/ebr-1-in-photos/ |access-date=2024-01-13 |website=www.ans.org |language=en}}</ref>  This coolant design was shared by the later [[Dounreay Fast Reactor]] which first went [[Criticality (status)|critical]] in 1959.