I hadn't heard that. Did Saddam include that in his little 15,000 page report?
Iraq had seven nuclear storage facilities, all were inspected by the IAEA after the end of the first gulf war, all were sealed by the IAEA. The main storage facility at Tuwaitha was extensively looted after the war. See: http://www.iraqwatch.org/un/IAEA/un-iaea-tuwaithareport-071403.pdf