제안 방법

• . Assuming that spent resin is stored at up to 80% of the total capacity in consideration of safety, the total amount of spent resin mixtures to be treated is 1,428,800 L, and assuming that all stored spent resin mixtures are treated in the next 3 years after permanent shutdown according to the NPP decommissioning plan, the daily treatment capacity was calculated as 1000 L/day. Based on this, the treatment capacity of each process was calculated as shown in Table 1.
• Design factors of each key process were analyzed, and a device, capable of treating 1000 L of spent resin mixtures (zeolite+activated carbon+spent resin+stored liquid waste) per day, was designed. The design standard of each process is a capacity that can treat 800 L of pre-reaction spent resin (moisture content about 50%) in view of the component ratio (spent resin 80%) of spent resin mixtures.
• PHWR spent resin mixture treatment equipment consists of 4 stages, i.e. the spent resin mixture transfer process, the resin separation process, the C14 desorption process, and the C-14 adsorption process, and the authors analyzed the factors necessary for designing the device in consideration of the characteristics of each process.
• C-14, recovered in the adsorbent, is an expensive resource. The authors are planning to find a method of concentrating and recycling it in the adsorption process so that it satisfies the commercial standard (50mCi/mmol) for manufacturing labeled compounds.
• This study separated spent resin from the spent resin mixture, deposited C-14, collected it in Ca(OH)₂ or Ba(OH)₂, and analyzed the factors that must be considered when designing a commercial device for treating PHWR spent resin mixtures based on the on-site verification experiment conducted to review the validity of recycling.