Super-DIREX is a new reprocessing method which has high economical efficiency. Experimental study of this process was started on the direct extraction of U and Pu from irradiated MOX fuel by the supercritical carbon dioxide (SFCO$_{2}$) containing TBP-HNO$_{3}$ complex. This report describes direct extraction of U and Pu with TBP-HNO3 complex at atmospheric pressure, as the first test for irradiated fuel, in order to investigate the applicability of SFCO$_{2}$ containing TBP-HNO$_{3}$ complex. In this test, dependency on dissolution temperature, Pu content, fuel/ TBP-HNO$_{3}$ complex ratio and effect of voloxidation were investigated. From these results, TBP-HNO$_{3}$ complex was found to be effective in the respect of the recovery of U and Pu. The number of the process step in dissolution and co-extraction is small, and amount of waste can be reduced. It is applicable to the direct extraction in Super-DIREX.