Radiation Improved (RI-mode) plasmas offer an attractive operating regime which has high radiating power fractions ( 0.5 ­ 0.9), energy confinement improvements relative to L-mode as measured by the ITERH89P scaling law, H89 = tE/t H89P [1], and operation near the Greenwald density limit (GW). The TEXTOR tokamak has demonstrated this scenario in a limiter device with steady state conditions [2] for impurity seeding of the plasma discharges with both neon (Ne) and argon (Ar). TEXTOR RI-mode experiments suggest that pumping and the control of recycling impurities play an important factor in obtaining the improved confinement of RI-mode. Recent studies on the JET tokamak have been initiated to investigate this mode in a larger non-circular tokamak which has a pumped divertor configuration, where pumping/recycling can be varied, in order to evaluate the importance of impurity recycling on the quality of RI-mode confinement in JET.