A former inspector for the International Atomic Energy Agency (IAEA) repudiated the UN nuclear watchdog\'s major new claim that Iran built an explosives chamber to test components of a nuclear weapon and carry out a simulated nuclear explosion.Gareth Porter says in a commentary that the IAEA claim that a foreign scientist - identified in news reports as Vyacheslav Danilenko - had been involved in building the alleged containment chamber has now been denied firmly by Danilenko himself in interviews with the Russian daily Kommersant and Radio Free Europe published Friday.