The second Nuclear Security Summit was held in Seoul on March 26 and 27, attended by leaders from 53 countries and representatives of four international organizations. The dangers of nuclear terrorism and improvement of nuclear security discussed at the summit are pressing issues Japan must seriously consider because it has experienced the fiasco at Tokyo Electric Power Co.'s Fukushima No. 1 nuclear power plant.
The Seoul summit, which followed the first NSS in April 2010 in Washington and hosted by U.S. President Barack Obama, discussed such measures as how to keep highly enriched uranium and plutonium out of the hands of terrorists and ensuring the security of nuclear plants following the Fukushima nuclear accident..
The simple and most important lesson of the Fukushima nuclear disaster is that terrorists do not need missiles or bombs to cause a catastrophic accident at a nuclear power plant. If they manage to breach the security of a nuclear power plant and cut off its power supply, they could forcibly disable the plant's cooling mechanisms and render it uncontrollable, leading to a release of a massive amounts of radioactive substances in the worst case.