Experimental Breeder Reactor I
Experimental Breeder Reactor No. 1
Experimental Breeder Reactor Number 1 in Idaho, the first power reactor.
|Location:||Butte County, Idaho, USA|
|Nearest city:||Arco, Idaho|
|Architect:||Atomic Energy Commission|
|Architectural style:||No Style Listed|
|Governing body:||United States Department of Energy|
|Added to NRHP:||October 15, 1966|
|Designated NHL:||December 21, 1965|
Experimental Breeder Reactor I (EBR-I) is a decommissioned research reactor and U.S. National Historic Landmark located in the desert about 18 miles (29 km) southeast of Arco, Idaho. At 1:50 pm on December 20, 1951 it became the world's first electricity-generating nuclear power plant when it produced sufficient electricity to illuminate four 200-watt light bulbs. It subsequently generated sufficient electricity to power its building, and continued to be used for experimental purposes until it was decommissioned in 1964.
As part of the National Reactor Testing Station (now known as the Idaho National Laboratory), EBR-I's construction started in late 1949. The reactor itself was designed by a team led by Walter Zinn at the Argonne National Laboratory. In its early stages, the reactor plant was referred to as Chicago Pile 4 (CP-4) and Zinn's Infernal Pile. Installation of the reactor at EBR-I took place in early 1951 (the first reactor in Idaho) and it began power operation on August 24, 1951. On December 20 of that year, atomic energy was successfully harvested for the first time. The following day the reactor produced enough power to light the whole building. The power plant produced 200kW of electricity out of 1.4MW of heat generated by the reactor.
The design purpose of EBR-I was not to produce electricity but instead to validate nuclear physics theory which suggested that a breeder reactor should be possible. In 1953, experiments revealed the reactor was producing additional fuel during fission, thus confirming the hypothesis. However, on November 29, 1955, the reactor at EBR-I suffered a partial meltdown during a coolant flow test. The flow test was trying to determine the cause of unexpected reactor responses to changes in coolant flow. It was subsequently repaired for further experiments, which determined that thermal expansion of the fuel rods and the thick plates supporting the fuel rods was the cause of the unexpected reactor response.
Although EBR-I produced the first electricity available in-house, a nearby reactor plant called BORAX-III was connected to external loads, powering the nearby city of Arco, Idaho in 1955, the first time a city had been powered solely by nuclear power.
Besides generating the world's first electricity from atomic energy, EBR-I was also the world's first breeder reactor and the first to use plutonium fuel to generate electricity (see also the Clementine nuclear reactor). EBR-1's initial purpose was to prove Enrico Fermi's fuel breeding principle, a principle that showed a nuclear reactor producing more fuel atoms than consumed. Along with generating electricity, EBR-1 would also prove this principle.
Decommission and legacy 
The site has been open to the public since 1976, but is only open between Memorial Day and Labor Day. Also on display at the site are two prototype reactors from the Aircraft Nuclear Propulsion Project of the 1950s.
There is also a separate facility called Experimental Breeder Reactor II.
See also 
- Argonne National Laboratory
- Obninsk Nuclear Power Plant, 5MWe, the first nuclear reactor to supply electricity to a power grid.
- Calder Hall, 50MWe x 4, the first nuclear power station to deliver power in commercial quantities.
- Aircraft Nuclear Propulsion Project
- Idaho National Laboratory
The reactor is in the building at center, the two structures lower left are reactors from the Aircraft Nuclear Propulsion Project
- "National Register Information System". National Register of Historic Places. National Park Service. 2007-01-23.
- "Experimental Breeder Reactor No. 1". National Historic Landmark summary listing. National Park Service. Retrieved 2008-02-06.
- Experimental Breeder Reactor 1, Argonne National Laboratory
- Fifty years ago in December: Atomic reactor EBR-I produced first electricity American Nuclear Society Nuclear news, November 2001
- http://www.ne.anl.gov/About/hn/news960320.shtml Argonne’s Nuclear Science and Technology Legacy: Chicago Pile reactors create enduring research legacy] part of the Argonne National Laboratory Highlights in the period 1942-1949]
- Nuclear energy for peace: the birth of nuclear energetics
- The Story of the Borax Nuclear Reactor and the EBR-I Meltdown — Ray Haroldsen ISBN 978-1-56684-706-3
- Blanche Higgins Schroer (June 12, 1976). "National Register of Historic Places Inventory-Nomination: Experimental Breeder Reactor #1" (PDF). National Park Service. Retrieved 2009-06-22. and PDF (1.43 MB)
- "Milestones:Experimental Breeder Reactor I, 1951". IEEE Global History Network. IEEE. Retrieved 3 August 2011.
- Media related to Experimental Breeder Reactor I at Wikimedia Commons
- Official site with visiting information
- "Reactor Makes Electricity." Popular Mechanics, March 1952, p. 105.