Brookhaven Lab Completes Decommissioning of Graphite Research Reactor
REACTOR CORE AND ASSOCIATED STRUCTURES SUCCESSFULLY REMOVED; WASTE SHIPPED OFFSITE FOR DISPOSAL
The U.S. Department of Energy’s (DOE) Brookhaven National Laboratory (BNL) has reached a major milestone by decommissioning a research reactor, ending the DOE Office of Environmental Management (EM) legacy cleanup activities at the site.
Workers finished removing the Brookhaven Graphite Research Reactor’s (BGRR) graphite core and associated structures, including the bioshield. This summer, the last shipment of radioactive materials from demolition of the 4,760-ton steel and concrete biological shield that encased the reactor core was transported to a licensed disposal facility.
The building that housed the reactor remains, and an engineered asphalt cap system has been installed around the reactor building to prevent rainwater from mobilizing any residual contamination in subsurface soil and remaining concrete structures in the ground beneath the building. Additionally, an extensive groundwater monitoring system has been installed.
“The work completed here demonstrates what can be accomplished by people with vision, with determination, and with corresponding goals,” DOE Under Secretary for Nuclear Security Thomas P. D’Agostino said. “That vision began with the idea of safely decommissioning a research facility that served its nation well.”
A total of nearly 24 million pounds of radioactive waste was removed from the BGRR, safely packaged and shipped to out-of-state licensed disposal sites. The total project cost to remove the reactor core and bioshield at completion was $74.6 million. The project received $39.5 million in funding from the American Recovery and Reinvestment Act, which accelerated environmental cleanup work substantially.
“Completion of this project is a real testament to DOE’s and Brookhaven’s commitment to cleaning up the Lab site and ensuring it remains safe for future generations of Long Islanders,” Assistant Laboratory Director for Environment, Safety & Health George Goode said. “This is a major milestone for us, for the Department of Energy and the nation, as it’s the first time a U.S. reactor of this type and size has been completely dismantled. Once again, the BGRR is paving the way for future innovations, as the techniques that project teams developed here to solve significant technical challenges associated with the decommissioning process are now being used in similar projects across the DOE complex.”
Decommissioning Started in the Early 1990s
Work to decommission the BGRR began in the late 1990s, and involved a number of sub-projects that included cleaning out the reactor’s below-ground ducts and removing its above-ground ducts, fanhouse, fuel canal, and the graphite core of the reactor. Dismantling the BGRR’s bioshield, the last of many major sub-projects completed during the decommissioning process, began in June 2010. The bioshield originally stood 55 feet long, 37 feet wide and 33 feet tall. Constructed of concrete walls four feet thick and sheathed in three-inch-thick steel, it protected workers and researchers from radiation produced in the reactor’s core.
The BGRR decommissioning was completed according to a Record of Decision (ROD) signed by DOE and the U.S. Environmental Protection Agency (EPA), with concurrence from the New York State Department of Environmental Conservation (DEC), on March 17, 2005. The Suffolk County Department of Health Services was in agreement with the ROD. Recovery Act-related decommissioning projects were managed by EM. Environmental remediation at the BNL is carried out under requirements of the federal Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA).
Major Milestone in Overall Lab Cleanup
The BGRR decommissioning marks a major milestone in the CERCLA cleanup at Brookhaven. The Lab’s other two reactors — the High Flux Beam Reactor (HFBR) and Brookhaven Medical Research Reactor — were shut down in 1996 and 2000, respectively. Both were placed in a safe storage mode, with all reactor fuel and fluids removed, until decommissioning is completed. The Lab currently has no operating reactors.
All of the other projects contained in the original interagency agreement involving DOE, EPA, and DEC — with the exception of the planned removal of the HFBR stack — have been completed. Thousands of tons of contaminated soils and material have been removed from the site, all planned on- and off-site groundwater treatment systems have been installed and are operating, and the Peconic River has been cleaned up and restored. In addition, the Lab has implemented extensive facility monitoring and environmental management programs to help prevent future impacts. In total, approximately $550 million has been spent to date to complete all the CERCLA projects.
Facility Marked First Peacetime Reactor
The BGRR was the first reactor built in the U.S. for peacetime atomic research following World War II. Construction began in 1947 and the reactor started operating in August 1950. In the next 18 years, an estimated 25,000 scientific experiments were carried out at the BGRR using neutrons produced in the facility’s 700-ton graphite core, made up of more than 60,000 individual graphite blocks. The BGRR was placed on standby in 1968 and then permanently shut down as the next-generation reactor, the HFBR, which produced more abundant amounts of neutrons for science experiments, was built next door to the BGRR.
During the BGRR’s operation, scientists worked at the facility to advance understanding of atomic nuclei, study the structures of solid materials, and investigate many physical, chemical and biological systems. The reactor also produced groundbreaking medical isotopes that are particularly useful in diagnosing and treating cancer and other diseases. Technetium-99m, a radioisotope that is currently used in more than 13 million medical procedures each year, came into widespread use as a result of its advancement at the BGRR as a key diagnostic tool.
To learn more, visit http://www.em.doe.gov/Pages/EMProjectOfMonth.aspx.
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