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  The UN's nuclear watchdog has expressed concern over Iran's continuing breaches of a 2015 agreement with world powers, accusing   Tehran   of significantly changing designs at a key nuclear plant. Details of a visit by an  International Atomic Energy Agency  delegation to Iran were revealed in an unreleased report seen by Reuters on Wednesday. Rafael Grossi, the IAEA chief, “is concerned that Iran has implemented a substantial change in the design information” at the  Fordow nuclear plant  without informing the agency in advance, the report said. Two IR-6 uranium enrichment cascades were interconnected in a manner “substantially different” from what Iranian officials had declared to the IAEA, it added. The IAEA has been at an impasse for months with Tehran, which has refused to yield to member state's urges to explain traces of highly-enriched uranium at undeclared sites. In November, it announced it would increase its stockpile of uranium and insta...