Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.
It is possible that North Korea built another plant previously and either transferred it to Yongbyon or simply built another one based on its experience of bringing the first, perhaps smaller, one into operation.
It may be true that their first prototype was small in scale. However, by now, I bet that they have bigger one than the one shown to U.S. expert in Pyongyang, which is operational and running deep underground
P!
NK is working rather feverishly to be able to supply the tech demands of their allies in the muslim and leftist world. Meanwhile there is a concerted effort not to look at them. And it’s working just fine.
http://www.freerepublic.com/focus/news/2630801/posts?page=30#30
BTW, NK uranium ore is very low grade and minimally of commercial value. Most of the ore assays at about .8% while the top commercial grade ores run at least 10 times that. The top Canadian mines run at 23%.
So what's going on? Why have all the centrifuges? 2,000 centrifuges can process uranium gas from about 2,000 tons of yellowcake a year, but the entire output of NK mines is about 300 tons. And, they don't have the conversion facilities to convert that yellowcake to gas.
Most likely they are trying to build and perfect P-1 and P-2 centrifuges for sale to others.
They have also given Russia the right to all their uranium ore because NK can't afford to mine it and convert it.
Uranium and centrifuges are a business to NK. There are many willing customers....Syria, Venezuela, Iran, Myanmar, the usual list of suspects.