The 35-nation board of the International Atomic Energy Agency is expected to approve a resolution Tuesday that ends the investigation.
An EU statement obtained before delivery reflects the will to move on after the agency assessed that Iran likely worked on elements of a nuclear weapon.
Unlike previous statements, it avoids criticism of Iran, saying only "we note" the IAEA conclusion.
The probe has to be formally closed as part of an Iran-six nation nuclear deal crimping present Iranian nuclear programs that could be used to make such weapons in exchange for sanctions relief for Tehran.