Liquid Metals Test Facility
Building 4023 was constructed in 1962 and housed a small sodium loop to conduct studies of radioactive contamination transport. A pumped sodium corrosion test loop was built there, and used to study the deposition behavior of activation products (Mn-54 and Co-60) in flowing sodium so as to develop more effective cold traps to remove these isotopes. An activated piece of fuel cladding containing these isotopes was used in these tests. This loop was utilized between 1976 and 1986.
In 1990 the high-efficiency particulate air (HEPA) filtration system and fume hoods were removed. The remainder of the radioactive liquid waste system (pipes, drains, tank) were removed in 1993.
The corrosion test loop was removed following termination of the project in 1986. In September 1993, a final decommissioning report was prepared. In 1994 a final survey was performed by Rocketdyne, followed by verification surveys by the Oak Ridge Institute of Science and Education (ORISE) in 1994, and the California Department of Health Services (DHS) in 1994 and then again in 1997. DOE published the facility certification docket and release certification in the Federal Register in 1997, and subsequently DOE released the facility for unrestricted use later in the same year. In 1998 the California DHS concurred with the Building 4023 release for unrestricted use. Building 4023 was demolished in October 1999.
In December 2002, EPA published a document review of prior surveys, confirming their results.
In November 2006, a final status survey of the building footprint was performed showing the land was suitable for release for unrestricted use.
In February 2008, ORISE performed a verification survey of the building footprint confirming that release limits had been satisfied.