The U.S. agency that oversees development and maintenance of the nation’s nuclear arsenal is moving ahead with plans to modernize production of key components for the weapons, but some watchdog groups and members of Congress are concerned about persistent delays and cost overruns.
The National Nuclear Security Administration released its annual plan on Monday, outlining the multibillion-dollar effort to manufacture plutonium pits, the spherical cores that trigger the explosion in thermonuclear weapons, at national laboratories in New Mexico and South Carolina.
