Yongbyon Declassified Part IV: Continued Construction Observed into 1967

Nuclear Weapons
, by Acquired almost two years after the image provided in Yongbyon Declassified Part III (February 11, 1966), this December 10, 1967 image of the Yongbyon Nuclear Research Center is one of the first acquired by the improved reconnaissance KH-4B. Among other improvements, the resolution of the newer KH-4B was 1.8 meters versus 2.7 meters of the earlier KH-4A allowing for considerably better image quality.

Yongbyon Declassified Part III: Significant Construction of Facilities at Nascent Yongbyon Nuclear Site by 1966

Nuclear Weapons
, by Acquired seven months after the image provided in Yongbyon Declassified Part II (August 23, 1965) this 2.7-meter resolution image covers the Yongbyon area on February 11, 1966. While the general area remains primarily engaged in agricultural activity typical of rural North Korea during the 1960s, significant construction activity is observed at the nascent Yongbyon Nuclear Research Center and adjacent village of Sang-dong.

Yongbyon: Movement of Specialized Railcars May Indicate Transfer of Radioactive Material

Military, Nuclear Weapons
, by and DigitalGlobe satellite imagery of North Korea’s Yongbyon Nuclear Research Facility acquired on April 12th shows the presence of five specialized railcars near the Uranium Enrichment Facility and the Radiochemistry Laboratory. In the past these specialized railcars appear to have been associated with the movement of radioactive material or reprocessing campaigns.

North Korea’s No. 17 Explosives Factory: No Significant Activity

Military, Nuclear Weapons
, by and Satellite imagery acquired on March 21, 2019 and over the past six months indicates that the No. 17 Explosives Factory near Hamhung is active. While no significant changes have occurred with its infrastructure during this period, the factory was expanded during 2012 with the construction of a large mixing/casting facility capable of producing large solid-propellant rocket motors for ballistic missiles.