The Department of Energy issued twenty “declassification determinations” between April 2011 and March 2015 to remove certain specified categories of nuclear weapons-related information from classification controls.
“The fact that a mass of 52.5 kg of U-235 is sufficient for a gun-assembled weapon” was formally declassified in a written decision dated August 19, 2014.
The “total inventory of thorium at DOE sites for any given time period” was removed from the Restricted Data category on March 20, 2013.
The “existence of unlimited life neutron generators” was declassified on October 24, 2013.
As a result of such determinations, the specified information need no longer be redacted from documents undergoing declassification review, and it can also be incorporated freely in new unclassified documents. ...
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