Atomics International was a division of the

North American Aviation North American Aviation (NAA) was a major American aerospace manufacturer that designed and built several notable aircraft and spacecraft. Its products included the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F- ...

company (later acquired by the

Rockwell International Rockwell International was a major American manufacturing conglomerate (company), conglomerate. It was involved in aircraft, the space industry, defense and commercial electronics, components in the automotive industry, printing presses, avioni ...

company) which engaged principally in the early development of

nuclear technology Nuclear technology is technology that involves the nuclear reactions of atomic nucleus, atomic nuclei. Among the notable nuclear technologies are nuclear reactors, nuclear medicine and nuclear weapons. It is also used, among other things, in s ...

and

nuclear reactors A nuclear reactor is a device used to initiate and control a fission nuclear chain reaction. They are used for commercial electricity, marine propulsion, weapons production and research. Fissile nuclei (primarily uranium-235 or plutonium-2 ...

for both commercial and government applications. Atomics International was responsible for a number of accomplishments relating to

nuclear energy Nuclear energy may refer to: *Nuclear power, the use of sustained nuclear fission or nuclear fusion to generate heat and electricity *Nuclear binding energy, the energy needed to fuse or split a nucleus of an atom *Nuclear potential energy, the pot ...

: design, construction and operation of the first nuclear reactor in California (1952), the first nuclear reactor to produce power for a commercial power grid in the United States (1957) and the first nuclear reactor launched into outer space by the United States (1965). Atomics International undertook the development of nuclear reactors soon after being established: a series of commercial nuclear power reactors beginning with the

Sodium Reactor Experiment The Sodium Reactor Experiment was a pioneering nuclear power plant built by Atomics International at the Santa Susana Field Laboratory near Simi Valley, California, Simi Valley, California. The reactor operated from 1957 to 1964. On July 12, 1957 ...

(SRE) and a range of compact nuclear reactors culminating with the Systems for Auxiliary Nuclear Power SNAP-10A system. Both efforts were successful, despite

nuclear accident A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include radiation poisoning, lethal effect ...

s at the

Santa Susana Field Laboratory The Santa Susana Field Laboratory (SSFL), formerly known as Rocketdyne, is a complex of industrial research and development facilities located on a portion of Southern California in an unincorporated area of Ventura County in the Simi Hills betw ...

, but overall interest in nuclear power steadily declined. The division transitioned to non-nuclear energy-related projects such as coal gasification and gradually ceased designing and testing nuclear reactors. Atomics International was eventually merged with another division (

Rocketdyne Rocketdyne is an American rocket engine design and production company headquartered in Canoga Park, California, Canoga Park, in the western San Fernando Valley of suburban Los Angeles, California, Los Angeles, in southern California. Rocketdyne ...

division) of the same parent company (Rockwell International). As of 2010, all of the Atomics International facilities, except for the few remaining facilities located in the Area IV test area at the Santa Susana Field Laboratory (SSFL), have been demolished, cleaned and reused, or awaiting final cleanup.

Company history

Following World War II, the potential of

nuclear power Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by ...

captured the interest of the United States Government and the general public. In 1948,

created an internal organization called the Atomic Energy Research Department (AERD) to manage its government and commercial nuclear research and development activities. The Atomic Energy Research Department designed, constructed and operated a 5 watt thermal aqueous homogeneous reactor at Downey, California, which on April 21, 1952, became the first nuclear reactor to operate in the State of California. In 1955, the AERD was renamed the Atomics International division of North American Aviation.

SRE – Sodium Reactor Experiment

The

was the result of Atomics International initially focusing on developing and commercializing reactor technology by undertaking the design of a nuclear power reactor capable of producing electricity on a commercial basis. Atomics International decided

sodium Sodium is a chemical element; it has Symbol (chemistry), symbol Na (from Neo-Latin ) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 element, group 1 of the peri ...

was a more appropriate nuclear reactor coolant than water. Sodium was chosen because it has excellent heat transfer properties, has a low operating pressure at typical reactor temperatures and it has a relatively low melting point. When used as a coolant for a nuclear reactor, water requires heavy piping since at the high reactor temperatures, water is kept under pressure. In the event of an accident, the sudden breach of the high temperature water system (among other things) necessitates a special containment vessel to capture the released pressure. Experience gained from conducting basic nuclear technology development provided Atomics International with the experience and practical knowledge necessary for the design, construction and operation of the Sodium Reactor Experiment nuclear reactor. On July 12, 1957, the Sodium Reactor Experiment became the first nuclear reactor in the United States to produce electrical power for a commercial power grid by powering the nearby city of Moorpark. In July 1959 an accident where the narrow internal cooling channels within the reactor fuel assemblies became obstructed by an organic contaminant causing 13 of 43 reactor core fuel elements to partially melt. Atomics International personnel repaired the reactor which was restarted in September, 1960 and operated until 1964. The company subsequently designed and developed a concept demonstration sodium cooled nuclear power unit for the Hallam Nuclear Generating Station in Nebraska and a concept demonstration organic (Santowax) cooled nuclear power unit for the Piqua Nuclear Generating Station, in Ohio as experimental demonstration projects for the Atomic Energy Commission. The Piqua reactor was a 45.5 MWe organically moderated and cooled reactor while Hallam was a

liquid metal cooled reactor A liquid metal cooled nuclear reactor (LMR) is a type of nuclear reactor where the primary coolant is a liquid metal. Liquid metal cooled reactors were first adapted for breeder reactor power generation. They have also been used to power nuclear ...

using metallic sodium with graphite as the moderator. Both Hallam and Piqua were beset by technical problems and operated only a few years before being permanently shut down.

SNAP – Systems for Nuclear Auxiliary Power

Development of a compact nuclear reactor for the

Systems for Nuclear Auxiliary Power The Systems Nuclear Auxiliary POWER (SNAP) program was a program of experimental radioisotope thermoelectric generators (RTGs) and Nuclear power in space, space nuclear reactors flown during the 1960s by NASA. The SNAP program developed as a resul ...

(SNAP) program largely coincided with Atomic International's Sodium Reactor Experiment effort. In the mid-1950s, Atomics International was chosen as the prime contractor to the U.S. Government for the development of the compact SNAP nuclear reactor. The number of specialized facilities located at the Santa Susana Field Laboratory rapidly increased. Following the successful 1965 launch of the SNAP 10A reactor, the U.S. Government canceled the program leaving a number of government–owned facilities at the site. In 1966, the Liquid Metal Information Center (later renamed the Energy Technology Engineering Center) was established by the U. S. Department of Energy as their center of liquid metal-related research. The ETEC reused many of the buildings formerly used in the SNAP program.

Other nuclear energy projects

Atomics International also engaged in a number of commercial projects. Atomics International built and operated the Atomics International Hot Lab (later renamed the Rockwell International Hot Lab) at the Santa Susana Field Laboratory. This facility performed the disassembly of fuel rods to support the on-site research and development of the SNAP reactors and for the decladding of nuclear fuel rods from off-site commercial nuclear reactors. Atomics International also developed a

coal gasification In industrial chemistry, coal gasification is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (), carbon dioxide (), methane (), and water vapour ()—from coal and water, air and/or oxygen. H ...

process using molten salt technology. As time passed, nuclear research and development activities steadily declined. As a result of this decline, Atomics International was organizationally combined with other Rockwell International operations to become the Energy Systems Group in 1978. Atomics International ceased as an autonomous business division, however, their remaining business activities were performed as the Atomics International division of Energy Systems Group, Rockwell International. The remaining Atomics International business operations were merged into the Rocketdyne division of

in 1984 when the Energy Systems Group was ended. Nuclear research programs and operations ceased in 1989 and all non-nuclear research ended in 1998. Rockwell International sold the Rocketdyne division to

The Boeing Company The Boeing Company, or simply Boeing (), is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and missiles worldwide. The company also provides leasing and product support s ...

in 1996. In 2005, Boeing sold Rocketdyne to

United Technologies Corporation United Technologies Corporation (UTC) was an American multinational corporation, multinational list of conglomerates, conglomerate headquartered in Farmington, Connecticut. It researched, developed, and manufactured products in numerous are ...

who combined it with an existing division and renamed them

Pratt & Whitney Rocketdyne Pratt & Whitney Rocketdyne (PWR) was an American company that designed and produced rocket engines that use liquid rocket propellants, liquid propellants. It was a division of Pratt & Whitney, a fully owned subsidiary of United Technologies Corpo ...

. Boeing retained ownership of the

property, including Area IV, with its environmental cleanup responsibilities. The Hamilton Sundstrand division of United Technologies Corporation became the recipient of the remaining technical knowledge from the Atomics International nuclear-related activities.

Facilities and operations

Atomics International has its beginnings in Downey then moved to several locations in the western end of California's

San Fernando Valley The San Fernando Valley, known locally as the Valley, is an urbanized valley in Los Angeles County, Los Angeles County, California. Situated to the north of the Los Angeles Basin, it comprises a large portion of Los Angeles, the Municipal corpo ...

in Canoga Park. Since all of the Atomics International facilities involved radioactive materials to some extent, documentation is available regarding the historical operations at each site.

Downey Facility

The Atomic Energy Research Development Group began operations in the North American Aviation plant located on Lakewood Drive in

Downey, California Downey is a city located in Southeast Los Angeles County, California, United States, southeast of Downtown Los Angeles. It is considered part of the Gateway Cities. The city is the birthplace of the Apollo space program and Taco Bell. It is ...

. They performed basic research and constructed at least one aqueous homogeneous reactor named the Water Boiler Neutron Source. The four watt reactor was shut down and moved to the

in December 1955. The reactor-related facilities were examined and determined to be free of residual radioactivity and reused as general office space. The Downey facility was transferred to the City of Downey and the buildings subsequently demolished and replaced with a variety of commercial buildings.

Vanowen Boulevard Facility

Atomics International occupied a building at the corner of Owensmouth Avenue and Vanowen Street in Canoga Park,

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, adjacent to the

Canoga facility. Principal work performed at the Vanowen facility included fuel development for the SNAP program, and radiochemistry. The site also supported the design, development and operation of two small aqueous homogeneous reactors, the 5 watt L-47 reactor and the ten watt L-77 reactor. By 1960, both reactors were closed and the radioactive materials removed from the site. Atomics International moved to their new DeSoto Avenue headquarters and Rocketdyne assumed the control of the Vanowen building. The Vanowen building was demolished in 2007.

De Soto Avenue Facility

In 1959, Atomics International established their headquarters at a complex of buildings located along De Soto Avenue in Canoga Park, California. The De Soto facility hosted the operation of a ten watt L-77 aqueous homogeneous reactor, nuclear reactor fuel fabrication, a gamma irradiation facility, and a radiochemistry laboratory. All of the operations involving radioactive materials were removed by the mid-1990s. The property is now owned and operated by

Aerojet Rocketdyne Aerojet Rocketdyne is a subsidiary of American Arms industry, defense company L3Harris that manufactures rocket, Hypersonic flight, hypersonic, and electric propulsive systems for space, defense, civil and commercial applications. Aerojet traces ...

Thompson-Ramo-Wooldridge Facility

Space was leased from Thompson-Ramo-Wooldridge Inc, renamed TRW in 1965, for nuclear research projects. It was located at Fallbrook Avenue and Roscoe Boulevard in Canoga Park (present day West Hills).

Santa Susana Field Laboratory (SSFL), Area IV Facility

From 1953 to 1989, three primary types of operations were conducted in the

Ventura County Ventura County () is a county located in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843. The largest city is Oxnard, and the county seat is the city of Ventura. Ventura County comprises ...

Simi Hills The Simi Hills are a low rocky mountain range of the Transverse Ranges in eastern Ventura County, California, Ventura County and western Los Angeles County, California, Los Angeles County, of Southern California, United States. The range runs ma ...

(SSFL) Area IV: Development and testing of nuclear reactors, nuclear support operations, and non-nuclear energy research and development at the Energy Technology Engineering Center. The research operations conducted by Atomics International are known to have caused some degree of chemical and radiological contamination to Area IV. The

U.S. Department of Energy The United States Department of Energy (DOE) is an executive department of the U.S. federal government that oversees U.S. national energy policy and energy production, the research and development of nuclear power, the military's nuclear we ...

has accepted responsibility for the cleanup of both chemical and radiological impacts within Area IV under the 2010 Administrative Order on Consent (AOC). The AOC requires the DOE to clean up both chemical and radiological contaminants to background concentrations within the underlying soils of the 290-acre Area IV. In May 2009, the US Environmental Protection Agency began a $41.5 million survey to determine the nature and extent of any radiological contamination within Area IV.

Development and testing of nuclear reactors

: Between 1954 and 1980 at the Santa Susana Field Laboratory several nuclear reactors were built, tested and operated in Area IV. These included both nuclear reactors and critical test assemblies. A critical test assembly is a very low-power reactor that does not require an active cooling system and frequently requires a separate neutron source to maintain critical neutron flux. :* Advanced Epithermal Thorium Reactor Nuclear Reactor Japan Stamp in 1957

The Advanced Epithermal Thorium Reactor was built for the Southwest Atomic Power Association at Building 100 in 1960. The AETR was used to test twenty different reactor core configurations by using an apparatus which supported a range of geometries. The AETR program was terminated in 1972. :* Homogeneous Water Boiler-type Reactors Atomics International designed and built a range of low-power (5 to 50,000 watts thermal) nuclear reactors for research, training and isotope production purposes. This aqueous homogeneous reactor type of low-power nuclear reactor used a 93% enriched uranyl sulphate solution held in a critical configuration in a spherical vessel. Reactivity was controlled using an arrangement of control rods within tubes penetrating the reactor vessel. The solution did not boil; rather, neutron and gamma flux caused radiolytic decomposition of water into hydrogen and oxygen in the form of tiny bubbles that gave the impression of boiling. One reactor model, the L-54, was purchased and installed by a number of United States universities and foreign research institutions, including Japan. The Japanese Atomic Research Institute renamed theirs Japan Research Reactor-1 (JRR-1) and the government of Japan issued a commemorative postage stamp noting the establishment of Japan's first nuclear reactor in 1957. The reactor was decommissioned in 1970 and is now maintained as
a museum exhibit with a Japanese-language website
at Tokaimura, Japan :* Sodium Reactor Experiment (SRE) program : The Sodium Reactor Experiment (SRE) was an experimental nuclear reactor which operated from 1957 to 1964. On July 12, 1957, its electrical generating system produced the first electricity generated from a nuclear power system to supply a commercial power grid in the United States by powering homes in the nearby city of Moorpark. In July 1959, the narrow internal cooling channels within the reactor fuel rod assemblies became obstructed by an unintended byproduct-produced organic contaminant, causing 13 of 43 reactor fuel elements to partially melt in an incident. Atomics International personnel repaired the reactor, which was restarted in September 1960 and operated with minor incidents until 1964. :* Systems for Nuclear Auxiliary Power (SNAP) program : The objective of the

program undertaken in 1955 by the United States was the development of compact, lightweight, reliable atomic electric devices for space, land and sea. The Atomic Energy CommissionAEC (predecessor to the Department of EnergyDOE), was the procurement agency for the Department of Defense (DOD) and National Aeronautics and Space AdministrationNASA requirements. The AEC was responsible for developing technologies that would allow the requirement to be fulfilled and for carrying out the initial phases of operational tests. From the period 1955 to 1973 when the program was terminated, approximately $850 million ''then-years'' dollars were spent by the United States to develop the SNAP nuclear reactors. Atomics International was the prime contractor to the AEC for the development of the SNAP reactors. In the late 1950s to the early 1960s, Atomics International established a number of government-owned facilities to support the SNAP program at the Energy Technology Engineering Center (ETEC) in Area IV of the

(SSFL). The SNAP-10A was the only

nuclear reactor A nuclear reactor is a device used to initiate and control a Nuclear fission, fission nuclear chain reaction. They are used for Nuclear power, commercial electricity, nuclear marine propulsion, marine propulsion, Weapons-grade plutonium, weapons ...

launched and flight tested by the United States. The City of Los Angeles issued a proclamation to recognize the accomplishment. The facilities included underground test facilities to test the compact SNAP nuclear reactors, non-nuclear test and support buildings, and administrative offices. Atomics International developed and tested five different SNAP reactors under the Systems for Nuclear Auxiliary Power Program. SSFL SNAP Building Complex 6Jan64

:* Nuclear support operations At the Santa Susana Field Laboratory, approximately twenty facilities were designed and built in Area IV to manage radioactive materials in support of the nuclear reactor programs. These operations included fuel fabrication, storage and reprocessing, radioactive measurement and calibration and radioactive waste management and disposal preparation. As of January 2010, only the Radioactive Materials Handling Facility remains in operation in support of the DOE's cleanup effort.

ETEC – Energy Technology Engineering Center

The Energy Technology Engineering Center (ETEC) specialized in the non-nuclear testing of components which were primarily designed to transfer heat from a nuclear reactor using liquid metals instead of water or gas. Atomics International operated the ETEC as a separate division at SSFL under contract to the

. The ETEC operated from 1966 to 1998.

Ownership and licensing

Atomics International was a division of a private company which engaged in the commercial enterprise of selling products and services to other companies, Universities and foreign governments. Atomics International also conducted research and development for the United States Government. Operating both as a contractor to the U.S. Government and as a commercial company, Atomics International maintained authorizations allowing for the use of radioactive materials in either situation. Activities using radioactive materials owned by the Department of Energy were supervised by that government agency and no licensing was required. For facilities such as the DeSoto, Vanowen operated under a permit to operate granted and monitored by the Nuclear Regulatory Commission or the California State Department of Health Services, Radiological Health Branch. Four buildings at SSFL were licensed by the NRC: Rockwell International Hot Lab (4020), The L-85 reactor building (4093), Nuclear Materials Development Facility (4055), and the Fast Critical Experiment Laboratory (4100). Personnel radiation exposure limitations were generally lower for those working in facilities licensed by the NRC as opposed to sites overseen by the DOE and operating personnel frequently rotated between the facilities.

References

Additional information

* Th
DOE's former Energy Technology Engineering Center Project website
provides extensive historical and current site cleanup information. ::''as do'' * Th
California Department of Toxic Substances Control SSFL Site Investigation and Cleanup
website. * A review of th

can be accessed using an interactive graphic. * A general operational history and detailed individual histories for each SSFL Area IV building can be found in the 200

document. * The US Environmental Protection Agency also produced a Historical Site Assessment for SSFL Area IV.

External links

U.S. Department of Energy (DOE): official Energy Technology Engineering Center (ETEC) Cleanup at SSFL website
– includes DOE cleanup of Atomics International facilities in ETEC/SSFL Area IV .
Official Boeing Santa Susana Field Laboratory (SSFL) Cleanup website
– including information on Boeing cleanup of ETEC/Area IV. {{Rockwell International 1955 establishments in California 1978 disestablishments in California Aerospace companies of the United States American companies disestablished in 1978 American companies established in 1955 Buildings and structures in Los Angeles Buildings and structures in Ventura County, California Canoga Park, Los Angeles Civilian nuclear power accidents Companies based in Los Angeles Defunct manufacturing companies based in Greater Los Angeles Electronics companies established in 1955 Energy companies established in 1955 Energy infrastructure in California History of the San Fernando Valley History of Ventura County, California Industrial buildings and structures in California Manufacturing companies based in Los Angeles Manufacturing companies disestablished in 1978 Manufacturing companies established in 1955 Non-renewable resource companies established in 1955 North American Aviation Nuclear accidents and incidents in the United States Rocketdyne Simi Hills Technology companies based in Greater Los Angeles Technology companies disestablished in 1978 Technology companies established in 1955 United States Atomic Energy Commission