President Barrack Obama says the United States is committed to developing new technologies to produce peaceful nuclear energy. He made these remarks on Monday at the start of a nuclear security summit in Seoul, South Korea. But one year after the disaster at Japan’s Fukushima Daiichi reactor complex, concerns about the safety of nuclear power linger on. Some activists, though, say there is no form of safe nuclear power.

Speaking at a South Korean university, Obama said the peaceful uses of nuclear energy bring many benefits. He pointed to advances in medicine and science, and said nuclear power is a comparatively clean and affordable means of energy production.