35. Based on the Agency’s continued study of information which the Agency has acquired from many Member States and through its own efforts, the Agency remains concerned about the possible existence in
Iran of past or current undisclosed nuclear related activities involving military related organizations, including activities related to the development of a nuclear payload for a missile. Since the last report of the
Director General on 25 February 2011, the Agency has received further information related to such possible undisclosed nuclear related activities, which is currently being assessed by the Agency. As previously
reported by the Director General, there are indications that certain of these activities may have continuedbeyond 2004.40 The following points refer to examples of activities for which clarifications remain necessary
in seven particular areas of concern:41
• High explosives manufacture and testing: developing, manufacturing and testing of explosive components suitable for the initiation of high explosives in a converging spherical geometry.
• Exploding bridgewire (EBW) detonator studies, particularly involving applications necessitating high simultaneity: possible nuclear significance of the use of EBW detonators.
• Multipoint explosive initiation and hemispherical detonation studies involving highly instrumented experiments: integrating EBW detonators in the development of a system to initiate hemispherical
high explosive charges and conducting full scale experiments, work which may have benefitted from the assistance of foreign expertise.