isn't it uranium nukular weapons that N. Korea allgedly has?
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Yes, that's my understanding.
N.K. has opted - if the reports I read are true - to pursue a U-235 fission based design.
The Federation of Atomic Scientists provides an overview of the N.K. program (somewhat dated) which is available here:
<http://www.fas.org/nuke/guide/dprk/index.html>
Also, there's a good overview of the basic types of nuclear weapons here:
<http://www.fas.org/nuke/intro/nuke/design.htm>
.d.
--------- "If human beings had more of a sene of humor, things might have turned out differently."
Stanislav Lem