A vessel for both treatment of radioactive wastewater and disposal of radioactive waste contained therein. The vessel comprises a main vessel structure including a shell formed of a metal material and a liner integrally coupled to the interior surface of the shell. The liner is preferably formed of a plastic material, such as high density polyethylene. Waste treatment equipment for treatment of the radioactive wastewater is provided within the shell. Ion exchange resin is typically located in the main vessel structure which, when spent, constitutes the radioactive waste which is subject to disposal. The vessel is preferably configured to function as a High Integrity Container (HIC).