[en] JAERI designed, fabricated, and installed the JAERI Fuel Cleanup System (J-FCU) as a subsystem of simulated fusion fuel loop at the TSTA. The main function of the J-FCU is to purify and to recover hydrogen isotopes from simulated plasma exhaust while exhausting tritium free impurities. J-FCU has been in tritium test since March, 1991. Ceramic electrolysis cell (CEC) was replaced with its spare on January 1992. The stand-alone tritium test was performed with full impurities (N₂, CQ₄ and Q₂O etc.) on February, 1992. Main purpose of this test was to evaluate the J-FCU total integrity and function with full impurities after replacing CEC. During this test, plugging of Cold Trap (CT) occurred twice and about 500 Ci of tritium exhausted to the Tritium Waste Treatment system (TWT). The safety interlock of the J-FCU acted well, so operation was carried out safely. This report describes the detail results of the above test and discuss its functions and difficulties. (author)