For the method developed to incorporate a radioactive waste ion exchange resin from a nuclear facility into a thermoplastic waste, the leachability of radionuclide from the solidified product has been studied as the functions of the leachants （demineralized water, ground water and sea water）, temperature (25 ℃ and 70 ℃), content of waste resin (30-60 wt%) and radiation exposure dose (10⁷-10⁹R). The specimen containing the waste resin up to 40 wt% shows good homogeneity, compressibility greater than 210 ㎏/㎠ and no evidence of swelling in the leachants. On the other hand, the cumulative fractions of Co-60 and Cs-137 leached from a specimen in the demineralized water at 25 ℃ are 0.11 and 8.3 %, respectively, and the leach rates are 2.02 × 10^-7 and 3.63 × 10^-4g/㎠-day, respectively, during leaching time of 91 days, and then these suggests that the product has good resistence against leaching. And the leachability has a tendency to increase with the increase of the waste resin content, cation content in leachant, temperature and radiation exposure dose.
The above results show that the thermoplastic waste of styrene series is applicable to solidifying the waste resin, that the optimum content of the waste resin might be 30 wt% in the product and that from the viewpoint of the leachability, it should be safe to dispose the product into the ground.