Share From 1966 to 1974, France conducted 41 above-ground test of nuclear weapons on the Moruroa atoll, including this one of a 0.9-megaton giant in the Licorne test on 3 July 1970. CTBTO/SCIENCE SOURCE France grossly underestimated radioactive fallout from atom bomb tests, study finds Mar. 11, 2021 , 2:30 PM From 1966 to 1974, France blew up 41 nuclear weapons in above-ground tests in French Polynesia, the collection of 118 islands and atolls that is part of France. The French government has long contended that the testing was done safely. But a new analysis of hundreds of documents ...