Here is the CIA report from November 19, 2002:
http://www.fas.org/nuke/guide/dprk/nuke/cia111902.html
Wehave seen an elevated parts procurement in the last two years, mainly by masking the identity of parts shipped through China. In 2007 and 2008 we discovered highly enriched uranium particles in aluminum tubes at Yongbyon when we inspected the destruction of the cooling towers there and the gutting of the machine shop.
Hardly a hidden facility, that's where the centrifuges are now, the old machine shop.
Here's a report from a month ago on the NK uranium enrichment program:
http://www.isis-online.org/uploads/isis-reports/documents/ISIS_DPRK_UEP.pdf
Thank you Gandalftb for putting this together.
Thanks gandalftb.