The Hanford Site is a decommissioned nuclear production complex operated by the United States federal government on the Columbia River in Benton County in the U.S. state of Washington. It has also been known as Site W and the Hanford Nuclear Reservation. Established in 1943 as part of the Manhattan Project, the site was home to the Hanford Engineer Works and B Reactor, the first full-scale plutonium production reactor in the world. Plutonium manufactured at the site was used in the first atomic bomb, which was tested in the Trinity nuclear test, and in the Fat Man bomb used in the bombing of Nagasaki. During the Cold War, the project expanded to include nine nuclear reactors and five large plutonium processing complexes, which produced plutonium for most of the more than 60,000 weapons built for the U.S. nuclear arsenal. Nuclear technology developed rapidly during this period, and Hanford scientists produced major technological achievements. The town of Richland, established by the Manhattan Project, became self-governing in 1958, and residents were allowed to purchase their properties. After sufficient plutonium had been produced, the production reactors were shut down between 1964 and 1971. Many early safety procedures and waste disposal practices were inadequate, resulting in the release of significant amounts of radioactive materials into the air and the Columbia River, resulting in higher rates of cancer in the surrounding area. The Hanford Site became the focus of the nation's largest environmental cleanup. A citizen-led Hanford Advisory Board provides recommendations from community stakeholders, including local and state governments, regional environmental organizations, business interests, and Native American tribes. Cleanup activity is still ongoing, with over 10,000 workers employed on cleanup activities. Hanford hosts a commercial nuclear power plant, the Columbia Generating Station, and various centers for scientific research and development, such as the Pacific Northwest National Laboratory, the Fast Flux Test Facility, and the LIGO Hanford Observatory. In 2015, it was designated as part of the Manhattan Project National Historical Park. Tourists can visit the site and B Reactor.
Geography The Hanford Site occupies 586 square miles (1,518 km2) – roughly equivalent to half the total area of Rhode Island – within Benton County, Washington. It is a desert environment receiving less than ten inches (250 mm) of annual precipitation, covered mostly by shrub-steppe vegetation. The Columbia River flows along the site for approximately 50 miles (80 km), forming its northern and eastern boundary. The Columbia and Yakima Rivers contain salmon, sturgeon, steelhead trout, and bass, and wildlife in the area includes skunks, muskrats, coyotes, raccoons, deer, eagles, hawks, and owls. The mountain cottontail is particularly abundant. The flora includes sagebrush, bitterbrush, a variety of grasses, prickly pear, and willow. The original site was 670 square miles (1,740 km2) and included buffer areas across the river in Grant and Franklin counties. Some of this land has been returned to private use and is now covered with orchards, vineyards, and irrigated fields. The site is bordered on the southeast by the Tri‑Cities, a metropolitan area composed of Richland, Kennewick, Pasco, and smaller communities, and home to nearly 300,000 residents. Hanford is a primary economic base for these cities. In 2000 large portions of the original site were turned over to the Hanford Reach National Monument. The remainder was divided by function into three main areas: the nuclear reactors were located along the river in an area designated as the 100 Area; the chemical separation complexes were located inland in the Central Plateau, designated as the 200 Area; and support facilities were located in the southeast corner of the site, designated as the 300 Area.
Climate
Hanford is the site of Washington state's highest recorded temperature of 120 °F (48.9 °C), reached on June 29, 2021.
Early history The confluence of the Yakima, Snake, and Columbia rivers has been a meeting place for native peoples for centuries. The archaeological record of Native American habitation of this area stretches back over ten thousand years. Tribes and nations including the Yakama, Nez Perce, and Umatilla used the area for hunting, fishing, and gathering plant foods. Archaeologists have identified numerous Native American sites, including "pit house villages, open campsites, fish farming sites, hunting/kill sites, game drive complexes, quarries, and spirit quest sites", and two archaeological sites were listed on the National Register of Historic Places in 1976. In 1855, Isaac Stevens, the governor of the Territory of Washington, negotiated with the Native American tribes to establish a reservation system, in which Native Americans could not occupy the area of the Hanford Site. Treaties were signed, but were often ignored, as the reservation system they mandated was not compatible with traditional food-gathering or family groupings. In September 1858 a military expedition under Colonel George Wright defeated the Native American tribes in the Battle of Spokane Plains to force compliance with the reservation system. Nonetheless, Native American use of the area continued into the 20th century. The Wanapum people were never forced onto a reservation, and they lived along the Columbia River in the Priest Rapids Valley until 1943. After gold was discovered in British Columbia, prospectors explored the Columbia River basin in search of gold, but with little success. Walla Walla, which had been established as a military post in 1858, became a center for mining supplies, and a general store was established at White Bluffs. A ranch was established in Yakima Valley by Ben Snipes in 1859, and the Northern Pacific Railroad was extended into the area beginning in 1879. The railroad engineers founded the towns of Kennewick and Pasco. Settlers moved into the region, initially along the Columbia River south of Priest Rapids. They established farms and orchards supported by small-scale irrigation projects, but most went bankrupt in the Panic of 1893. The Reclamation Act of 1902 provided for federal government participation in the financing of irrigation projects, and the population began expanding again, with small town centers at Hanford, White Bluffs and Richland established between 1905 and 1910. The Great Depression of the 1930s decreased the price of agricultural commodities and many farms were foreclosed on or abandoned. The economy was supported by the construction of the Grand Coulee Dam between 1933 and 1942, and the establishment of the Naval Air Station Pasco in 1942.
Manhattan Project
Background During World War II, the S-1 Section of the federal Office of Scientific Research and Development (OSRD) sponsored a research project on plutonium. Research was conducted by scientists at the University of Chicago Metallurgical Laboratory. At the time, plutonium was a rare element that had only recently been synthesized in laboratories. It was theorized that plutonium was fissile and could be used in an atomic bomb. The United States government was concerned that Nazi Germany was developing a nuclear weapons program. The Metallurgical Laboratory physicists worked on designing nuclear reactors ("piles") that could irradiate uranium and transmute it into plutonium. Meanwhile, chemists investigated ways to separate plutonium from uranium.
DuPont appointment In September 1942, Brigadier General Leslie R. Groves Jr. became the director of the Manhattan Project, as it came to be known. The project to build industrial-size plants for the manufacture of plutonium was codenamed the X‑10 project. Groves engaged DuPont, a firm he had worked with in the past on the construction of explosives plants, to design, construct, and operate the plutonium manufacturing complex. To avoid being labeled as merchants of death, as the company had been after World War I, DuPont's executive committee insisted that it should receive no payment. For legal reasons, a Cost Plus Fixed Fee contract was agreed, with a fee of one dollar. The president of DuPont, Walter S. Carpenter Jr., was given assurances that the government was assuming all responsibility for the hazards involved in the project.
Site selection Carpenter expressed reservations about building the reactors at Oak Ridge, Tennessee; with Knoxville only 20 miles (32 km) away, a catastrophic accident might result in loss of life and severe health effects. Even a less deadly accident might disrupt vital war production, particularly of aluminum, and force the evacuation of the Manhattan Project's isotope separation plants. Spreading the facilities at Oak Ridge out more would require the purchase of more land and the expansion needed was still uncertain; for planning purposes, six reactors, and four chemical separation plants were envisioned. The ideal site was described by eight criteria:
A clean and abundant water supply (at least 25,000 US gallons per minute (1,600 L/s)) A large electric power supply (about 100,000 kW) A "hazardous manufacturing area" of at least 12 by 16 miles (19 by 26 km) Space for laboratory facilities at least 8 miles (13 km) from the nearest reactor or separations plant The employees' village no less than 10 miles (16 km) upwind of the plant No towns of more than a thousand people closer than 20 miles (32 km) from the hazardous rectangle No main highway, railway, or employee village closer than 10 miles (16 km) from the hazardous rectangle Ground that could bear heavy loads The most important of these criteria was the availability of electric power. The needs of war industries had created power shortages in many parts of the country, and use of the Tennessee Valley Authority (TVA) was ruled out because the Clinton Engineer Works was expected to use up all its surplus power. This led to consideration of alternative sites in the Pacific Northwest and Southwest, where there was surplus electrical power. Between December 18 and 31, 1942, just twelve days after the Metallurgical Laboratory team led by Enrico Fermi started up Chicago Pile 1, the first nuclear reactor, a three-man party consisting of Colonel Franklin T. Matthias and DuPont engineers A. E. S. Hall and Gilbert P. Church inspected the most promising potential sites. Matthias reported to Groves that the Hanford Site was "far more favorable in virtually all respects than any other"; the survey party was particularly impressed by the fact that a high-voltage power line from Grand Coulee Dam to Bonneville Dam ran through the site, and there was an electrical substation on its edge. Groves visited the site on January 16, 1943, and approved the selection. The facility became known as the Hanford Engineer Works (HEW), and the site was codenamed Site W.
Land acquisition
The Secretary of War, Henry L. Stimson, authorized the acquisition of the land on February 8, 1943. A Manhattan District project office opened in Prosser, Washington, on February 22, and the Washington Title Insurance Company opened an office there to furnish title certificates. Federal Judge Lewis B. Schwellenbach issued an order of possession under the Second War Powers Act the following day, and the first tract was acquired on March 10. Some 4,218 tracts totaling 428,203.95 acres (173,287.99 ha) were to be acquired, making it one of the largest land acquisition projects in American history. Most of the land (some 88 percent) was sagebrush, where eighteen to twenty thousand sheep grazed. About eleven percent was farmland, although not all was under cultivation. Farmers felt that they should be compensated for the value of the crops they had planted as well as for the land itself. Because construction plans had not yet been drawn up, and work on the site could not immediately commence, Groves decided to postpone the taking of the physical possession of properties under cultivation to allow farmers to harvest the crops they had already planted. This reduced the hardship on the farmers, and avoided the wasting of food at a time when the nation was facing food shortages and the federal government was urging citizens to plant victory gardens. The War Department arranged with Federal Prison Industries for crops to be harvested by prisoners from the McNeil Island Penitentiary. The harvest in the spring and summer of 1943 was exceptionally good, and high crop prices due to the war greatly increased land values. Litigation was needed to resolve disputes over the compensation due to the sellers. Discontent over the acquisition was apparent in letters sent from Hanford Site residents to the War and Justice Departments, and the Truman Committee began making inquiries. Stimson met with chairman of the committee, Senator Harry S. Truman, who agreed to remove the Hanford Site from the committee's investigations on the grounds of national security. Trial juries were sympathetic to the claims of the landowners and the payments awarded were well in excess of the government appraisals. When the Manhattan Project ended on December 31, 1946, there were still 237 tracts remaining to be settled. About 1,500 residents of Hanford, White Bluffs, and nearby settlements were relocated, as well as the Wanapum people, Confederated Tribes and Bands of the Yakima Nation, the Confederated Tribes of the Umatilla Indian Reservation, and the Nez Perce Tribe. Native Americans were accustomed to fishing in the Columbia River near White Bluffs for two or three weeks in October. The fish they caught were dried and provided food for the winter. The Natives rejected offers of an annual cash payment, and a deal was struck allowing the chief and his two assistants to issue passes to fish at the site. This authority was later revoked for security reasons. Matthias gave assurances that Native American graves would be treated with respect, but it would be fifteen years before the Wanapum people were allowed access to mark the cemeteries. In 1997, the elders were permitted to bring children and young adults onto the site once a year to learn about their sacred sites.
Construction workforce DuPont advertised for workers in newspapers for an unspecified "war construction project" in southeastern Washington, offering an "attractive scale of wages" and living facilities. Normally for a development in such an isolated area, employees would be accommodated on site, but in this case for security and safety reasons it was desirable to locate them at least 10 miles (16 km) away. Even the construction workforce could not be housed on site, because some plant operations would have to be carried out during start-up testing. The Army and DuPont engineers decided to create two communities: a temporary constructions camp and a more substantial operating village. Construction was expedited by locating them on the sites of existing villages to take advantage of the buildings, roads and utility infrastructure already in place. They established the construction camp on the site of the village of Hanford, and the operating village on that of Richland.
The construction workforce peaked at 45,096 on June 21, 1944. About thirteen percent were women, and non-whites made up 16.45 percent. African-Americans lived in segregated quarters, had their own messes and recreation areas, and were paid less than white workers. Three types of accommodation were provided at Hanford: barracks, hutments and trailer parking. The first workers to arrive lived in tents while they erected the first barracks. Barracks construction commenced on April 6, 1943, and eventually 195 barracks were erected: 110 for white men, 21 for black men, 57 for white women, and seven for black women. Hutments were prefabricated plywood and Celotex dwellings capable of accommodating ten to twenty workers each. Between them, the barracks and hutments held 39,050 workers. Many workers had their own trailers, taking their families with them from one wartime construction job to the next. Seven trailer camps were established, and at the peak of construction work 12,008 people were living in them. DuPont put the contract for building the village of Richland out to tender, and the contract was awarded to the lowest bidder, G. Albin Pehrson, on March 16, 1943. Pehrson produced a series of standard house designs based on the Cape Cod and ranch-style house design fashions of the day. Pehrson accepted the need for speed and efficiency, but his vision of a model late-20th-century community differed from the austere concept of Groves. Pehrson ultimately had his way on most issues, because he worked for DuPont, not the Army. The resulting compromise would handicap Richland for many years with inadequate sidewalks, stores, and shops, no civic center, and roads that were too narrow. Unlike Oak Ridge and Los Alamos, Richland was not surrounded by a high wire fence, thus Matthias asked DuPont to ensure that it was kept neat and tidy.
Construction
Construction of the nuclear facilities proceeded rapidly. Before the end of the war in August 1945, the HEW built 554 buildings at Hanford, including three nuclear reactors (105‑B, 105‑D, and 105‑F) and three plutonium processing plants (221‑T, 221‑B, and 221‑U). The project required 386 miles (621 km) of roads, 158 miles (254 km) of railway, and four electrical substations. The HEW used 780,000 cubic yards (600,000 m3) of concrete and 40,000 short tons (36,000 t) of structural steel. Construction on B Reactor commenced in August 1943 and was completed on September 13, 1944. The reactor went critical in late September and, after overcoming neutron poisoning, produced its first plutonium on November 6, 1944. The reactors were graphite moderated and water cooled. They consisted of a 28-by-36-foot (8.5 by 11.0 m), 1,200-short-ton (1,100 t) graphite cylinder lying on its side, penetrated horizontally through its entire length by 2,004 aluminum tubes containing 200 short tons (180 t) of uranium slugs. They had no moving parts; the only sounds were those of the water pumps. Cooling water was pumped through the tubes at the rate of 30,000 US gallons per minute (1,900 L/s). This was enough water for a city of a million people.
Production process
Uranium arrived at the Hanford Engineer Works in the form of billets. In the Metal Fabrication and Testing (300) Area they were extruded into rods and machined into cylindrical pieces, 1.569 inches (3.99 cm) in diameter and 8 inches (20 cm) long, known as "slugs". The initial charge of the three reactors required more than twenty thousand billets, and another two thousand were needed each month. Uranium is highly reactive with water, so to protect the slugs from corrosion by the cooling water they were canned in aluminum after being dipped into a molten bath of copper–tin alloy, and the cap was arc welded on. A defective can could burst and jam in the reactor, stop the flow of cooling water, and force a complete shutdown of the reactor, so the canning process had to be precise.
Irradiated fuel slugs were transported by rail on a special railroad car operated by remote control to huge remotely-operated chemical separation plants about 10 miles (16 km) away. The separation buildings were massive windowless concrete structures, 800 feet (240 m) long, 80 feet (24 m) high and 65 feet (20 m) wide, with concrete walls 3 to 5 feet (0.91 to 1.52 m) thick. Inside the buildings were canyons and galleries where a series of chemical processing steps separated the small amount of plutonium from the remaining uranium and fission products. Items were moved about with a 60-foot (18 m) long overhead crane. Once they began processing irradiated slugs, the machinery became so radioactive that it would be unsafe for humans ever to come in contact with it, so the engineers devised methods to allow for the replacement of components via remote control. Periscopes and closed-circuit television gave the operator a view of the process. They assembled the equipment by remote control as if the area was already radioactive. To receive the radioactive wastes from the chemical separations process, there were "tank farms" consisting of 64 single-shell underground waste tanks. The first batch of plutonium was refined in the 221‑T plant from December 26, 1944, to February 2, 1945, and delivered to the Los Alamos Laboratory in New Mexico on February 5, 1945. Two identical reactors, D Reactor and F Reactor, came online on December 5, 1944, and February 15, 1945, respectively, and all three reactors were running at full power (250 megawatts) by March 8, 1945. By April kilogram-quantity shipments of plutonium were headed to Los Alamos. Road convoys replaced the trains in May, and in late July shipments began being dispatched by air from the airport at Hanford.
Production activities
Although the reactors could be shut down in two-and-a-half seconds, they would still generate heat due to the decay of fission products. It was therefore vital that the flow of water should not cease. If the power failed, the steam pumps would automatically cut in and continue to deliver water at full capacity for long enough to allow an orderly shutdown. This occurred on March 10, 1945, when a Japanese balloon bomb struck a high-tension line between Grand Coulee and Bonneville. This caused an electrical surge in the lines to the reactors. A scram was automatically initiated and the safety devices shut the reactors down. The bomb failed to explode and the transmission line was not badly damaged. The Hanford Engineer Works was the only U.S. nuclear facility to come under enemy attack. Hanford provided the plutonium for the bomb used in the 1945 Trinity nuclear test. Throughout this period, the Manhattan Project maintained a top-secret classification. Fewer than one percent of Hanford's workers knew they were working on a nuclear weapons project. Groves noted in his memoirs that "We made certain that each member of the project thoroughly understood his part in the total effort; that, and nothing more." The existence and purpose of Hanford was publicly revealed through press releases on August 7 and 9, 1945, after the bombing of Hiroshima but before Hanford plutonium was used (in a Fat Man) during the bombing of Nagasaki on August 9. Matthias was succeeded as area engineer by Colonel Frederick J. Clarke in January 1946. DuPont would soon be gone too. Carpenter asked to be released from the contract. Groves informed Robert P. Patterson, who had succeeded Stimson as Secretary of War on September 21, 1945, Groves's choice of replacement was General Electric (GE), which took over operations at Hanford on September 1, 1946, and accepted a formal control on September 30. On December 31, 1946, the Manhattan Project ended and control of the Hanford Site passed to the Atomic Energy Commission (AEC). The total cost of the Hanford Engineer Works up to that time was $348,101,240 (equivalent to $5,747,234,637 in 2025).
Cold War
Production problems GE inherited serious problems. Running the reactors continuously at full power had resulted in the Wigner effect, swelling of the graphite due to the displacement of the atoms in its crystalline structure by collisions with neutrons. This had the potential to buckle the aluminum tubes used for the fuel and control rods and disable the reactors completely if a water pipe ruptured. The polonium-210 used in the Fat Man's neutron initiators had a half-life of only 138 days, so it was essential to keep a reactor running or the weapons would be rendered inoperative. The Army therefore shut down B Reactor on March 19. In August 1946, Franklin was informed that irradiating the feed to produce over 200 grams of plutonium per metric ton of uranium was resulting in too much undesirable plutonium-240 in the product. The power level on D and F Reactors was reduced, which also extended their useful life. Some experiments were conducted with annealing the graphite. It was found in laboratory testing of samples that heating to 400 °C (752 °F) retired the graphite by 24 percent, to 600 °C (1,112 °F) by 45 percent and to 1,000 °C (1,830 °F) by 94 percent, but the consequences of heating the reactors so much had to be considered before this was attempted.
The other problem was that the bismuth phosphate process used to separate the plutonium left the uranium in an unrecoverable state. The Metallurgical Laboratory had researched a promising new redox separation process, using hexone as a solvent. The AEC was concerned about the supply of uranium, and the General Advisory Committee of the AEC recommended that construction of a redox plant be given top priority. Meanwhile, the waste-settling tanks filled up with sludge, and attempts to transport it to the waste storage (241) areas were unsuccessful. It was therefore decided to bypass the waste settling tanks and send sludge directly to the 200 area, and construction of a bypass commenced in August 1946. GE invited bids for the construction of a new waste storage tank farm. Efforts were made to make better use of the available uranium. Turnings, cuttings, and shavings from the slug manufacture process had been sent to the Ames Laboratory in Iowa for briquetting. The equipment there was shipped to the Hanford Engineer Works. The briquettes, along with uranium scrap metal, was sent to the Metal Hydrides Company for recasting into billets. During 1947, tensions with the Soviet Union escalated as the Cold War set in. Clarke was succeeded by Carleton Shugg on September 2. Within days of arrival he demanded overtime be used to speed up construction work then in progress. The size of the nuclear stockpile was limited by plutonium production. There was enough for thirteen bombs at the end of 1947. Walter J. Williams, the AEC's director of production, worked with GE engineers to produce plans for three replacement reactors (called BR, DR, and FR). To save time and money, they would be built adjacent to the existing reactors, where they would be able to use their cooling water and separation facilities. Two more reactors would then be built on new sites.
While this was being considered by the AEC, GE experimented with annealing, and found that if the reactors were run at 299 °C (570 °F) and then slowly cooled, the graphite's crystalline structure could be restored. The reactors could be run at higher temperatures by increasing the power level. Some helium in the atmosphere surrounding the reactors was replaced with carbon dioxide, which conducted heat less efficiently. This allowed more heat to build up in the graphite. To reduce the incidence of cans jamming, their size was reduced from 8 to 4 inches (20 to 10 cm). More plutonium was produced by keeping the fuel elements in the reactor longer. Instead of pushing the entire tube out, half of it was, allowing elements to spend time in parts of the reactor where the neutron flux was less dense. The old reactors could now be run much longer. In December, the AEC approved a scaled-back construction plan, with only one replacement reactor, at site D (called DR), and one reactor at a new site (called H). The new reactors used the same designs as the wartime ones, although they had more pure graphite to allow them to be run at higher power levels, and smaller graphite blocks surrounding the process tubes to restrict expansion.
Growth of Richland
The population of Richland had already begun to increase again. In 1946 the Hanford Site had 4,479 operating employees and 141 construction workers. Two years later this had increased to 8,628 operating employees and 14,671 construction workers. Richland grew from 14,000 people in 1947 to 22,000 in 1950. To house the construction workers, a new construction camp was established called North Richland, which had a peak population of 13,000 in 1948. Many operating employees and construction workers also lived in Kennewick and Pasco. Shugg arranged for barracks to be brought by barge down the Columbia River from the old Naval Air Station Pasco. About 3,850 houses remained from the war; these were augmented by 800 houses and 64 apartments in 1947, and another 1,000 houses and apartments in 1948. Although the population stabilized, a housing shortage persisted into the 1950s. GE closed down the last of the dormitories in 1958. Richland had a newspaper, the Richland Villager, and every resident received a free copy. Commercial concession holders were pressured to buy advertising space. The villagers paid low rents for their houses, and Village Services was available to help with unpacking, laying carpets or babysitting.
The adult population of Richland had an average education of 12.5 years, and 40 percent of the men had attended college, compared with 22 percent in the state of Washington as a whole, and the median annual family income in 1959 was $8,368 (equivalent to $92,421 in 2025) compared with $6,225 (equivalent to $68,752 in 2025). In 1950 26 percent of American families had an annual income of less than the poverty line of $2,000 (equivalent to $27,000 in 2025). In the nearby towns of Pasco and Kennewick, 24.4 and 25.2 percent respectively were below the poverty line; in Richland, it was just 4.9 percent. The percentage of high school graduates in Richland was 74.3 percent, compared with 53.5 in Pasco and 54.6 in Kennewick. Women constituted a quarter of the workforce, and the number of working wives was much higher than the national average. Although GE liked to present an image of a middle-class community, most of the Hanford Site employees were working-class shift workers with high school education only. There were few senior citizens in Richland – in 1947 the AEC still required retirees to give up their homes – but the birth rate in 1948 was 34 per 1,000, well above the national average of 20 per 1,000. This tapered off during the 1950s, but there remained a larger than usual number of school-age children. There were only seven black people in Richland in 1950; this increased to 189 by 1960, when they accounted for 1.3 percent of the population. Only two black people worked for the AEC at the Hanford Site in 1951, less than a dozen were employed by GE, and about 250 by the construction contractors. The use of eating and recreational facilities by black people was discouraged, but not prohibited. Black people were even less welcome in Kennewick; only four resided there in 1950 and five in 1960. Kennewick was a sundown town where there was a curfew for black people. They congregated in Pasco, where 1,213 black people lived in a 5-acre (2.0 ha) ghetto on the town's eastern fringe. They had no sewerage or running water in 1948, because the town's leaders felt that the black community should provide the $5,000 (equivalent to $67,001 in 2025) to pay for it. Black residents also did not qualify for Federal Housing Administration (FHA) loans.
Soon after taking over from the Army, the AEC had contemplated the future of the communities of Richland, Oak Ridge, and Los Alamos. The commissioners were eager to divest the AEC of the burden of their management. In 1947, AEC general manager Carroll L. Wilson commissioned Lyman S. Moore, the city manager of Portland, Maine, and an expert on municipal government, to produce a report on the management of the communities. He produced a road map to self-government. The first step was to overhaul the accounting system to produce comparable reports on housing, commercial operations, utilities, and government. It would then be possible to move to charging market rates for rents, utilities, and municipal services, and ultimately to establish self-government. There was scant enthusiasm for this in Richland, but the United States was engaged in an ideological conflict with the Soviet Union over the superiority of the American way. The AEC's September 1950 appropriation called upon it to take steps to impose democratic government and free enterprise on the AEC communities. The first step was taken on October 1, 1953, when the AEC increased the rents in Richland by 25% to bring them into line with those in neighboring communities. In 1955, the town voted on disposal and incorporation; both measures were overwhelmingly defeated. Nonetheless, that year Congress passed Public Law 221, which provided for the transfer of government property in Richland to the townsfolk. Thousands of people attended protest rallies and sent angry letters and petitions to Congress. Congressional hearings were held, and prices set by the FHA were reduced. People who had been dispossessed by the acquisition process during the war petitioned to be allowed to buy their property back, but they were ignored. By July 1958, 4,200 homes had been sold. After receiving assurances that the AEC would continue to subsidize schools and municipal services through the 1960s, the citizens of Richland voted for incorporation, and the town became self-governing on December 12, 1958. In 1960 Richland received an All-America City Award.
Camp Hanford During the war the Hanford Site was patrolled by a Military Police detachment which, as of June 1945, had forty soldiers. In April 1947, they were replaced by GE security guards, who were issued M8 Greyhound armored cars. The Army was concerned that U.S. plutonium production was centered at one vulnerable site. In March 1950 the 5th Anti-aircraft Artillery Group arrived to provide air defenses, and established its headquarters in North Richland. The group consisted of four battalions, the 83rd, 501st, 518th, and 519th Anti-aircraft Artillery Battalions, each of which had four batteries of 120 mm anti-aircraft guns. Each battery had four guns, which were deployed in sandbagged revetments on a 20-acre (8.1 ha) site with wooden, prefabricated metal and containing barracks, latrines, mess halls, motor pools, radars, and administrative facilities. The military base was designated "Camp Hanford" in 1951. The following year the guns were augmented by Nike Ajax missiles, which were deployed at three sites on Wahluke Slope and one on what is now the Fitzner-Eberhardt Arid Lands Ecology Reserve. Each site had two underground missile storage magazines, twenty missiles, and eight missile launchers. The Nike Ajax missiles were later replaced with Nike Hercules missiles. The development of intercontinental ballistic missiles made the missiles obsolete, and Camp Hanford became an outpost of Fort Lewis on July 1, 1959. The missile batteries were disbanded in 1960, and Camp Hanford was closed on March 31, 1961.
Early expansion Cold War tensions escalated in April 1948 with the Berlin Airlift. Construction was under way on the new DR and H Reactors, but the quickest way to increase production was to restart B Reactor. This was authorized later that month. Shugg was recalled to Washington, DC, to serve as the AEC deputy general manager in August, and was succeeded by Frederick C. Schlemmer on September 16. In turn, he was succeeded by David F. Shaw on June 1, 1950. Shaw was succeeded by James E. Travis in June 1955, and he remained the site manager until June 1965. It was also possible to improve productivity. Zirconium was added to the cans to stabilize them under high exposures, and tests confirmed that they could withstand three times the exposure used in 1946 without rupture. In March 1950, GE was authorized to run the reactors at 305 MW instead of 250. This cut the use of raw materials by half, and yielded forty percent more plutonium per operating dollar.
The Soviet Union detonated its first atomic bomb on August 29, 1949. The explosion was detected by a U.S. Air Force weather reconnaissance aircraft four days later. In response, President Harry S. Truman authorized a crash program to develop the hydrogen bomb. Preliminary designs called for large amounts of tritium. This could be produced in a reactor using target slugs loaded with lithium deuteride and fuel rods containing enriched uranium. One or more reactors would have to be set aside for tritium production. H Reactor was chosen, and started producing tritium in 1950. For the longer term, the AEC decided to construct new reactors, of a different design using enriched uranium and heavy water as a moderator, at a new site, which became the Savannah River Site. The outbreak of the Korean War in September 1951 prompted the AEC to authorize a sixth reactor at Hanford on January 23, 1951. Construction began in June. The new reactor was built in the B area and called C Reactor. The same basic graphite-moderated design was used, with improvements to give it a rated power of 750 MW. The new reactor became operational in November 1952. On February 25, 1952, Truman authorized two more reactors at the Hanford Site. These were called K West and K East, and were sited at Coyote Rapids between the B and D areas. They were known as "Jumbo" reactors for their much larger size. They still used the same graphite-moderator technology, but had improvements to allow them to operate at 1,800 MW. Each used 2,800 short tons (2,500 t) of graphite, over a thousand tons more than the three wartime reactors, and had concrete shields instead of steel and masonite. They had more feed tubes and reduced spacing between them. Improvements in water-pump design allowed them to have eighteen pumps instead of the fifty in the wartime reactors, but were capable of pumping 125,000 US gallons per minute (7,900 L/s). As with the other reactors, the cooling water was collected in ponds, allowed to cool, and then tipped back into the river. An innovation was that heat from the cooling water was used to heat the work places. Each Jumbo reactor required about 300 operators to run it, compared with 400 for H Reactor. This represented a saving of a million dollars a year (equivalent to $9 million in 2024). Although capable of being run at up to 4,400 MW, the AEC imposed an administrative limit of 4,000 MW on them. Since plutonium‑239 has a half-life of 24,100 years, AEC chairman Gordon Dean calculated that sufficient plutonium would be produced by the mid-1960s. With this in mind, the reactors were designed with a life of twenty years.
Separation facilities In addition to the new reactors there were also new separation facilities. The AEC had long been dissatisfied with the wasteful bismuth phosphate separation process. GE conducted research into an alternative, reduction-oxidation (REDOX) process. This used methyl isobutyl ketone (hexone) as a solvent. It was developed at the Hanford Site in the 3706 Building and tested in the 321 Building. The AEC approved the REDOX process in May 1949, and work began on the new plant the following year. Construction ran behind schedule, and it did not commence operation until January 1952. Known as the 202-S Building or the S Plant, it was 470 feet (140 m) long and 160 feet (49 m) wide, and could process up to twelve metric tons of uranium per day, compared with the B and T Plants' 1.5 tons per day. It also had the advantage of consolidating the separation activities in one building. Unlike the bismuth phosphate process, it produced uranium as a byproduct. The low flash point of hexone meant that special precautions had to be taken against the possibility of an explosion. The hexone could not be reused as it was highly water-soluble and was unstable in nitric acid. Removing the uranium meant that the waste products were highly radioactive. The facility operated until 1967 and processed approximately 22,400 metric tons of uranium fuel rods.
The U Plant was modified to use the REDOX process to recover uranium from the wastes left over from the bismuth phosphate process, but with a different solvent, tributyl phosphate. Due to the plant's layout, it could not use the tall columns and gravity flow that characterized the REDOX plant, so pulsed columns were used instead. The plutonium uranium redu