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US says it conducted experiment aimed at improving ability to detect nuclear blast

By Thomson Reuters Sep 30, 2026 | 6:53 PM

By Kanishka Singh

WASHINGTON, Sept 30 (Reuters) – The US National Nuclear Security Administration conducted a “subsurface, non-nuclear chemical high-explosive ​experiment” on Wednesday that the ‌Energy Department said aimed to improve the United States’ ability to detect low-yield nuclear explosions.

DETAILS:

• The experiment was focused on improving US capabilities ‌to ​detect a “decoupled” explosion, the ⁠type of test ⁠Washington alleged China had conducted in June 2020 to decrease the effectiveness of seismic monitoring.

• The United States ​accused Beijing earlier this year of conducting the secret nuclear test in ⁠2020 as it ⁠called for a new, broader ​arms control treaty.

• China said at the ​time that the US allegation was “entirely ‌unfounded” and an attempt “to fabricate excuses for resuming” US nuclear testing.

• The US National Nuclear Security Administration successfully conducted ⁠the experiment at the Nevada National Security Site in the P Tunnel in Area 12, using chemical ⁠high-explosives ‌and radiotracers, the Energy Department ⁠said in a statement on ​Wednesday.

• ‌It added that data ​collected from ⁠the experiment will be used to validate scientific models and refine algorithms critical to US nuclear explosion detection efforts.

(Reporting by Kanishka Singh in Washington; Editing by ​Jamie Freed)