FILE - International Atomic Energy Agency Director General Rafael Mariano Grossi waits to meet Japan's Prime Minister Fumio Kishida shakes hands at the prime minister's office in Tokyo Thursday, March 14, 2024. The head of the United Nations' nuclear watchdog will travel to Iran next week as Tehran's nuclear program enriches uranium a step away from weapons-grade levels and international oversight of the program remains limited, officials said Wednesday, May 1, 2024. (AP Photo/Eugene Hoshiko, Pool, File)
A model of Bushehr nuclear power plant is on display in an exhibition of the Iran's nuclear achievements during the "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
Head of Iran's atomic energy department Mohammad Eslami speaks during Iran's "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
Head of Iran's atomic energy department Mohammad Eslami speaks during Iran's "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
Items of Iran's nuclear achievements are on display during Iran's "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
A participant of Iran's "International Conference on Nuclear Science and Technology" visits an exhibition of the country's nuclear achievements in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
An Iran's Atomic Energy Organization expert speaks with participants of "International Conference on Nuclear Science and Technology" as they visit an exhibition of Iran's nuclear achievements in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
Participants applaud during opening ceremony of Iran's "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)
Participants sit during opening ceremony of Iran's "International Conference on Nuclear Science and Technology" in the central city of Isfahan, Iran, Monday, May 6, 2024. (AP Photo/Vahid Salemi)