Images show N. Korea efforts to restart nuclear complex

 Images show N. Korea efforts to restart nuclear complex

SEOUL - Satellite imagery suggests North Korea is making "wide-ranging, extensive" efforts to fully reactivate its main nuclear complex, a US think tank said Tuesday, in line with Pyongyang's vows to strengthen its weapons programme.

Recent images show work at the Yongbyon nuclear compound apparently aimed at producing fuel rods to be used in a plutonium reactor, Johns Hopkins University's US-Korea Institute said.

Analysis of the imagery identified one "probable fuel fabrication plant" for the 5-megawatt plutonium reactor that reopened earlier this year, researcher Nick Hansen wrote on the institute's blog, 38 North.

The isolated communist state staged its third nuclear test in February - its most powerful to date - after two previous tests in 2006 and 2009. Two months later, it boasted that it would reopen the Yongbyon nuclear compound in the northwest that had been shut since 2007, in order to bolster its atomic arsenal.

"The soot on the new roof shows that a heating process had occurred, such as the use of metal casting furnaces necessary to complete the heat treatment during the fuel rod assembly," Hansen wrote.

A white stain on the roof of the facility was believed to be hydrofluoric acid used to produce fuel rods.

A nearby venue that appears to be a dumping site showed a large amount of "grey materials" suspected to be ash from the fuel rod production process, he added.

"The identification of these facilities indicates a more wide-ranging, extensive effort by North Korea to modernise and restart the Yongbyon complex... than previously understood," he wrote.

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