Satellite image of the Yongbyon nuclear facility, 100 kilometers north of the North Korean capital, Pyongyang (Photo: EPA/VNA)

The monitoring website 38 North made the assessment Friday, based on recent satellite imagery, also noting that minor activities have been spotted at the site's uranium enrichment plant while construction of a new wing of a lab building continued. North Korea's continued construction of a new wing of one of the laboratory buildings and expansion of other facilities demonstrate Pyongyang's "determination to continue their research and improve their capabilities at the Yongbyon complex.