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The US National Nuclear Security Administration (NNSA) conducted a subsurface, non-nuclear high-explosive experiment in Nevada on Wednesday as part of efforts to strengthen the country’s ability to detect low-yield nuclear explosions.
The Energy Department said the experiment was designed to improve US capabilities for identifying so-called “decoupled” explosions. Such tests involve methods intended to reduce the seismic signals generated by an underground blast, potentially making nuclear explosions more difficult for international monitoring systems to detect.
The experiment comes amid renewed US concerns about covert nuclear testing. Washington earlier this year accused China of secretly conducting a nuclear test in June 2020 using a technique intended to reduce the effectiveness of seismic monitoring.
US officials raised the allegation while calling for negotiations on a new and broader arms control treaty. Beijing rejected the accusation, describing it as “entirely unfounded” and arguing that Washington was attempting to create a justification for restarting US nuclear testing.
According to the Energy Department, the latest NNSA experiment was successfully carried out at the Nevada National Security Site. The test took place in the P Tunnel in Area 12 and involved chemical high explosives and radiotracers rather than a nuclear device.
Officials emphasized that the experiment was non-nuclear and was intended to provide researchers with data that could improve technologies used to identify potentially concealed nuclear detonations.
Information gathered during the Nevada experiment will be used to validate scientific models and refine detection algorithms, the Energy Department said. Those systems are considered important for distinguishing nuclear explosions from earthquakes, conventional blasts and other underground seismic events.
The experiment highlights Washington’s focus on strengthening nuclear test monitoring capabilities as concerns over global nuclear arsenals and arms control agreements increase.
By improving the detection of low-yield and potentially decoupled nuclear explosions, US officials aim to make it more difficult for countries to conduct covert tests without being identified by monitoring networks.
