Small modular nuclear reactor reaches criticality in first test - Ars Technica

The reactor, from a startup called Antares, isn’t ready to generate power yet. - John Timmer 

Just over a year ago, the Trump Administration issued an executive order meant to accelerate the development of nuclear power in the US...

• On Thursday, a startup called Antares announced that a test reactor it had placed at the Idaho National Laboratory had reached criticality, making it the first new design to cross this threshold. 
• Criticality means that the nuclear reactions inside the hardware had become self sustaining; it does not mean the reactor had started to generate power...