| Y-12 National Security Complex | |
|---|---|
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 Y-12 National Security Complex in Oak Ridge, Tennessee | |
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| Country | United States of America |
| Location | Oak Ridge, Tennessee |
| Coordinates | 35°59′18″N84°15′17″W / 35.98833°N 84.25472°W /35.98833; -84.25472 |
| Status | Operational |
| Construction began | February 1943 |
| Commission date | November 1943 |
| Owner | National Nuclear Security Administration |
| Operator | Consolidated Nuclear Security |
| Employees | 8,600 |
| External links | |
| Website | https://www.y12.doe.gov/ |
| Commons | Related media on Commons |
TheY-12 National Security Complex is aUnited States Department of EnergyNational Nuclear Security Administration facility located inOak Ridge, Tennessee, near theOak Ridge National Laboratory. It was built as part of theManhattan Project for the purpose ofenriching uranium for the first atomic bombs.[1] In the years after World War II, it has been operated as a manufacturing facility for nuclear weapons components.
Y-12 is managed and operated under contract byConsolidated Nuclear Security (CNS), which is composed of member companiesBechtel,Leidos,Orbital ATK, andSOC, withBooz Allen Hamilton as a teaming subcontractor.[2]
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Y-12 is theWorld War II code name for theelectromagneticisotope separation plant producingenriched uranium at theClinton Engineer Works in Oak Ridge, Tennessee, as part of theManhattan Project. Construction began in February 1943 under the management ofStone & Webster. Because of a wartime shortage ofcopper, the massive electromagnetic coils were made with 14,700 tons of coinagesilver from U.S. government vaults at West Point.[3][4] ColonelKenneth D. Nichols met with the Under Secretary of the Treasury,Daniel W. Bell, and requested between five and ten thousand tons of silver. Bell's stunned reply was, "Colonel, in the Treasury we do not speak of tons of silver; our unit is thetroy ounce." Thus the Manhattan Engineer District requested and was loaned 395 milliontroy ounces (13,500short tons; 12,300 t) from the West Point Depository for the duration of the Manhattan Project. Special guards and accountants were assigned to the silver, and their responsible caretaking meant that at the end of the war, less than 0.036% (14,220 oz t) of the roughly $300 million ($5.91 billion in2025) of loaned silver was lost to the process, with the remainder returned to the Treasury.[5]
The Y-12 facility began operating in November 1943, separatinguranium-235 fromnatural uranium, which is 99.3%uranium-238, by usingcalutrons to perform electromagnetic isotope separation. Y-12 separated the uranium-235 forLittle Boy, thenuclear weapon that wasdropped on Hiroshima, Japan on August 6, 1945.K-25, another facility in Oak Ridge, produced enriched uranium usinggaseous diffusion. However, K-25 did not begin operating until March 1945 and fed slightly enriched uranium to Y-12's Beta Calutrons as the push to obtain enough uranium-235 for Little Boy came in the early summer of 1945. TheS-50 Thermal Diffusion Plant at the K-25 site also provided feed material for Y-12's Beta Calutrons.
Tennessee Eastman was hired by theArmy Corps of Engineers to manage Y-12 during the Manhattan Project. The company transferred scientists fromKingsport, Tennessee, to Y-12 and operated the plant from 1943 to May 1947.[6] The Y-12 electromagnetic plant units were initially operated by scientists fromUC Berkeley to remove bugs and achieve a reasonable operating rate. They were then turned over to trained Tennessee Eastman operators who had only a high school education. Nichols compared unit production data and pointed out to physicistErnest Lawrence that the young "hillbilly" girl operators were outproducing his doctorate-holding scientists. They agreed to a production race and Lawrence lost, a morale boost for the Tennessee Eastman workers and supervisors. The girls were "trained like soldiers not to reason why", while "the scientists could not refrain from time-consuming investigation of the cause of even minor fluctuations of the dials".[7] The young women that worked in this capacity came to be known as "Calutron Girls."[8]
TheUnion Carbide corporation succeeded Tennessee Eastman as the operating contractor in 1947, remaining until 1984 when Union Carbide relinquished the contract for operating DOE's Oak Ridge facilities, and theMartin Marietta corporation (laterLockheed Martin) won the contract to take over the operation. BWXT Y-12 (name later changed to B&W Y-12) succeeded Lockheed Martin as the Y-12 operator in November 2000.[9]
At 11 p.m. on June 16, 1958, acriticality accident occurred in the C-1 Wing of Building 9212 at the facility, then operating under the management of Union Carbide. In the incident, a solution of highly enriched uranium was mistakenly diverted into a steel drum, causing afission reaction of 15–20 minutes duration. Eight workers were hospitalized for moderate to severeradiation sickness or exposure, but all eventually returned to work.
In June 1960, the eight workers (Bill Wilburn, O. C. Collins, Travis Rogers, R. D. Jones, Howard Wagner, T. W. Stinnett, Paul McCurry, and Bill Clark) filed suit against theAtomic Energy Commission. The suit was settled out-of-court. Wilburn, who had received the highest radiation dose, was awarded $18,000 (approximately $195,000 in 2024). Clark received $9,000 (worth approximately $97,200 in 2024).[10] Under theEnergy Employees Occupational Illness Compensation Program, the eight later received additional compensation from the government; Clark collected multiple payments totaling about $250,000. Most, if not all, of the eight victims were diagnosed with cancer at some point during their lives.[11] As of 2023[update], Clark is the only surviving member of the eight.[10][12]
A chemical explosion injured several workers at the Y-12 facility on December 8, 1999, whenNaK was cleaned up after an accidental spill, inappropriately treated with mineral oil, and inadvertently ignited when the surface coating ofpotassium superoxide was scratched by a metal tool.[13]
At 9 a.m. on February 22, 2023, a fire broke out in a uranium processing area of Building 9212.[14][15] In a statement from the National Nuclear Security Administration, the fire was said to be contained later the same day.[14]
Y-12's primary missions since the end of theCold War have been to support defense needs throughstockpile stewardship, assist on issues ofnuclear non-proliferation, support the Naval Reactors program, and provide expertise to other federal agencies.[16] Y-12 is also responsible for the maintenance and production of all uranium parts and "secondary" mechanisms for every nuclear weapon in the United States arsenal.
Y-12 has a history of providing secure storage of nuclear material for both the United States and other governments. Early efforts focused on securing material from the former Soviet Union;[17] recent activities have included recovery of highly enriched uranium from Chile.[18] Environmental cleanup has been an ongoing issue for the Department of Energy in Oak Ridge. The Y-12 plant was listed as anEPA Superfund site in the 1990s for groundwater andsoil contamination. The Y-12 plant was listed on the DOE's Cleanup Criteria/Decision Document Database (or C2D2 database).[19] An influx of funding from theAmerican Recovery and Reinvestment Act benefited cleanup efforts by funding demolition and decontamination of aging facilities.[20] These efforts work to further the long-term reduction in the size of the Y-12 facility.[21]
Y-12 employs approximately 8,600 people, including subcontractors.[22] About 1,500 personnel work onsite as employees of organizations that includeUT-Battelle,Science Applications International Corporation, UCOR, and WSI Oak Ridge (an American-controlled unit ofG4S Secure Solutions), which holds the security contract for the site. Workers at the site were represented by theOil, Chemical and Atomic Workers International Union.[23]
Since 1988, Oak Ridge Environmental Peace Alliance has organized non-violent direct action protests at the Y-12 Complex, in an effort to close down the weapons plant. Sister Mary Dennis Lentsch, a Catholic nun, has been arrested many times for protesting at the Oak Ridge facility.[24] She has said, "I believe the continuing weapons production at the Y-12 National Security Complex in Oak Ridge, Tennessee, is in direct violation of the treaty obligations of the United States and consequently, is a violation of Article 6 of the U.S. Constitution".[25]
In 2011, the Rev.William J. Bichsel, an 84-year-old priest, received a prison sentence of three months for trespassing on federal property at the Y-12 complex.[26][27] In 2012, there were protests about the new uranium processing facility.[28]
In July 2012, SisterMegan Rice, an 82-year-old Catholic sister of theSociety of the Holy Child Jesus, and two military veterans, Gregory Boertje-Obed, and Michael Walli, entered the Y-12 complex. They were allPlowshares activists, and they chose Y-12 because of its crucial role in the production of nuclear weapons. They spray-painted anti-war slogans on the exterior of the Highly Enriched Uranium Materials Facility, a structure for storing weapons-grade uranium.[29] Theanti-nuclear activists, who got past fences and disabled security sensors before dawn on July 28, spent several hours in the complex, spray-painted peace messages, and prayed and sang before they were stopped by guards. The security breach prompted private experts to criticize the Department of Energy's safeguarding of nuclear materials.[30] TheDOE-OIG found that all of the defenses for the plant were insufficient and that the security response had "troubling displays of ineptitude."[31] On May 9, 2013, the three were convicted of sabotage. In her testimony, Sister Rice said, "I regret I didn't do this 70 years ago."[32]
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