The U.S. Air Force has upgraded the classification of information pertaining to nuclear weapons inspections performed by the Inspector General, reducing or eliminating public references to the outcome of such inspections. Until recently, the IG weapons inspections could be described in unclassified reports. Now they will be classified at least at the Confidential level. An […]
The ability to detect a clandestine nuclear explosion in order to verify a ban on nuclear testing and to detect violations has improved dramatically in the past two decades. There have been “technological and scientific revolutions in the fields of seismology, acoustics, and radionuclide sciences as they relate to nuclear explosion monitoring,” according to a […]
By Hans M. Kristensen The Pentagon’s latest annual report to Congress on Chinese military and security developments describes a nuclear force that is similar to previous years but with a couple of important new developments in the pipeline. The most sensational nuclear news in the report is the conclusion that China is developing a new […]
The fact that a particular nuclear weapon has (or does not have) a “dial-a-yield capability” enabling the selection of a desired explosive yield was declassified earlier this year, in a joint decision of the Department of Defense and the Department of Energy. Last year, the Department of Energy also declassified the thickness of the “getter […]
In 1959, physicists Hans Bethe, J. Robert Oppenheimer and Edward Teller were candidates to receive the Enrico Fermi Award for contributions to the development of atomic energy. In a newly discovered letter written in June 1959, Los Alamos physicist Norris Bradbury provided his evaluation of the achievements of each of the three eminent scientists. His […]
By Hans M. Kristensen The venerable B-52H Stratofortress long-range bomber is no longer listed by the National Nuclear Security Administration (NNSA) with a capability to deliver nuclear gravity bombs. US Strategic Command (STRATCOM) apparently has not been assigning nuclear gravity bombs to B-52 bombers since at least 2010. Today, only the 20 B-2 stealth-bombers are […]
There are at least four major “strategic security challenges” that could place the United States at risk within the next decade, physicist Richard L. Garwin told the National Academy of Sciences earlier this month. “The greatest threat, based on expected value of damage, is cyberattack,” he said. Other challenges arise from the actions of North […]
This special report is a result of the FAS U.S.-French Naval Nuclear Task Force and is focused on the life-of-the-ship reactors and role of accelerated testing on naval propulsion fuels and reactors. The report is written by Dr. George Moore.
By Hans M. Kristensen The latest set of New START aggregate data released by the US State Department shows that Russia is decreasing its number of deployed strategic warheads while the United States is increasing the number of warheads it deploys on its strategic forces. The Russian reduction, which was counted as of March 1, […]
Subcritical nuclear tests remain useful for maintaining the U.S. nuclear weapons stockpile in the absence of nuclear explosive testing, the JASON defense advisory panel affirmed in a letter report last year. But “a gap exists in the current US capability to carry out and diagnose such experiments,” the panel said. Subcritical experiments simulate aspects of […]
By Hans M. Kristensen Under the cover of an otherwise legitimate life-extension of the W76 warhead, the Navy has quietly added a new super-fuze to the warhead that dramatically increases the ability of the Navy to destroy hard targets in Russia and other adversaries. In a new article in the Bulletin of the Atomic Scientists Matthew […]
By Hans M. Kristensen Today I spoke at the Nuclear Deterrence Summit about the role and challenges of US-Russian nuclear arms control efforts. My panel partner was Mark Schneider from NIPP and we were under the competent chairmanship of Vice Admiral Van Mauney (US Navu, Ret.), the former deputy commander of US Strategic Command. My […]