North Korea said it has hit the button on its fifth and potentially most powerful nuclear test Friday morning, claiming to have successfully detonated a nuclear warhead that could be mounted on ballistic rockets. cnn.com

Uranium mining and milling contribute only a small amount to nuclear energy’s already low greenhouse gas emissions, the first comprehensive life cycle assessment of greenhouse gas emissions produced from Canadian uranium mining operations has found. world-nuclear-news.org

The Japanese Electric Power Company (J-Company) said Friday that the operational start for the country’s first plutonium-uranium mixed oxide fuel plant would be delayed by two years to allow time for safety tests by the country’s nuclear industry regulator. nuclearstreet.com

The Obama administration’s pursuit of a possible United Nations Security Council resolution against nuclear weapons tests has riled a group of Republican lawmakers, who have warned President Barack Obama not to take action that would circumvent the U.S. Senate’s constitutional power to ratify treaties. wsj.com