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Building 4003From 1957 through 1964, Building 4003 was used to assemble fuel for the Sodium Reactor Experiment (SRE),” according to the Department of Energy. “In Building 4003, uranium and thorium metal slugs were loaded into metal tubes, the remaining tube space was filled with sodium, and the tubes were then sealed.

“Later activities involved research into the reprocessing of used (or irradiated) fuel assemblies. A process was developed to make a partial separation of used fuel, removing part of the fission products so that the material could be used again as reactor fuel. These bench scale tests were done in a well-shielded ‘Hot Cave’ located at Building 4003. This research was not developed into a full scale process.”

The facility was subsequently released for unrestricted use by the DOE in 1985 and was demolished in 1999.

Building 4009“Both the Organic Moderated Reactor and the Sodium Graphite Reactor were low-power critical experiment facilities,” according to the Department of Energy. “Building 4009 was originally constructed in 1958 to house both critical facilities. Although both the OMR and SGR operated from 1958 to 1967, they were used for different purposes.

“The Organic Moderated Reactor (OMR) Critical Facility was used for testing uranium fueled reactors moderated and cooled by organic liquids. Various types and configurations of fuel elements and core geometries were tested. The OMR was a pilot plant to test the possibility of developing a larger nuclear power plant that would provide commercial electricity.”

“The California Depatment of Health Services (DHS) performed verification surveys of the OMR high bay in 1995 and the whole building in 1998. Based on the results of these surveys, the DHS released Building 4009 for unrestricted use in January 1999.”

Building 4011“Building 4011 was constructed in 1958 and was used to support various non-nuclear programs until 1984,” according to DOE. “The northern portion of Building 4011 was used as the Radiation Instrumentation Calibration Laboratory from 1984 until 1996. The calibration lab was then moved to Building 4100. While in 4011, the lab used only sealed radioactive sources and electro-deposited calibration sources. Although slightly contaminated air monitoring equipment was repaired at this facility, there is no evidence of any facility contamination during its use as a calibration lab.

“The Property Inventory and Control Department used the south section of the building. Building 4011 is currently used to house communications equipment.”