A evaluation study in radioactive precipitation processing

It has made comparative study of the mass balance, the construction costs and operating expense in the hydrochloric acid dissolution process and the nitric acid dissolution process for removal of the uranium and stabilization of fluorine in calcium fluoride in the calcium fluoride precipitation including the uranium generated from Ningyo Toge Works. Comparison of mass balance had been carried out by the amounts of generation of secondary waste. As a result, the amounts of generation of secondary waste of the nitric acid dissolution process-3 had been the least, and it had increased in order of the hydrochloric acid dissolution process, the nitric acid dissolution process-2, and the nitric acid dissolution process-1. The construction cost of the hydrochloric acid dissolution process was the cheapest, and it became expensive in the order of the nitric acid dissolution process-3, the nitric acid dissolution process-2, and the nitric acid dissolution process-1. About operation expense, the nitric acid dissolution process-3 was the cheapest, and became high in the order of the hydrochloric acid dissolution process, the nitric acid dissolution process-2, and the nitric acid dissolution process-1. In addition, a similar evaluation had been performed with the process, which reduces volume by drying the precipitation directly. The process, which dries the precipitation directly and reduces volume, has the advantage that the volume of the precipitation can be reduced at low cost. However, when the separation of the uranium will be needed in the future since the uranium in the precipitation is not separated, the uranium separation expense is newly needed. (author)