You don't use metal in advanced research reactors. Alloys yes, pure metal no. It swells a LOT under irradiation You use it to cast into hemispheres, slugs or Oralloy tampers. Metallic uranium is for for bombs. They're very close if they are doing this.https://www.theguardian.com/world/2021/jan/17/grave-military-implications-iran-making-uranium-metal-alarms-europe …
Nah, they used public available designs for a reactor from the UK. That started in the 80s. They've had scientists from Russia ( paid ) since the 90s. Well chronicled. The basic bomb designs have been around for 80 years.
Het laden lijkt wat langer te duren.
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