Washington (CNN)-- New satellite images obtained by CNN reveal North Korea is expanding a key facility capable of enriching uranium for nuclear weapons, renovations that likely indicate the country plans to significantly ramp-up production at this once-dormant site in the near future, according to experts who analyzed the photos.

Images captured by commercial imaging company Maxar earlier this week show construction is underway at a uranium enrichment plant located within the Yongbyon Nuclear Research Facility complex -- changes that could allow North Korea to increase production of weapons-grade nuclear material by as much as 25 percent, Jeffrey Lewis, a weapons expert and professor at the Middlebury Institute of International Studies, told CNN.