http://www.slate.com/articles/health_and_science/science/2013/09/fukushima_disaster_new_information_about_worst_case_scenarios.html

Hours after a massive earthquake and tsunami struck Japan on March 11, 2011, a team of Livermore scientists mobilized to begin assessing the danger from the crippled Fukushima Dai-ichi nuclear plant. The scientists’ work—secret at the time and barely known to the public even today—had an enormous impact on Japan’s nuclear crisis, averting a potentially disastrous U.S. overreaction.