The US Department of Energy flags fly near the department's headquarters on February 14, 2025, in Washington, DC. Anna Moneymaker/Getty Images

The federal agency responsible for overseeing and modernizing the US nuclear stockpile will furlough the vast majority of its staff Monday as the government shutdown drags on, according to the Department of Energy.

About 1,400 employees at the National Nuclear Security Administration, or NNSA, will receive furlough notices Monday, while fewer than 400 employees will remain on the job to safeguard the stockpile, Energy Department spokesperson Ben Dietderich told CNN.

Energy Secretary Chris Wright will speak about the shutdown’s impact on the US’ nuclear deterrent efforts Monday while visiting the Nevada National Security Site.

The NNSA Office

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