| 摘要 |
<p>A continuous dissolution apparatus and a dissolving method for spent nuclear fuel in which a container (2) for holding a dissolution processing solution (1) is continuously supplied with nitric acid from a feed port (3), while the processing solution is continuously drawn out from an outlet (4) are provided. Baskets (71 - 74) in the container are packed with spent-fuel chops (6), which are continuously dissolved by the processing solution. The container is provided with a solution reserving portion (4) for lowering the concentration of radioiodine contained in the dissolution processing solution, and a partition wall (10) is formed between the solution reserving portion and a container body. The dissolution processing solution having overflowed from the upper edge of the partition wall flows into the solution reserving portion (14) through a perforated plate column (11). The solution reserving portion is furnished with a heating coil (12) for heating the dissolution processing solution and generating steam, and a gas blow pipe (13) for injecting an inert or nitrogen oxide gas into the solution. Thus, elementary iodine within the dissolution processing solution of the solution reserving portion is expelled from the off-gas outlet (5) of the container together with the steam, and the radioiodine concentration in the dissolution processing solution of the solution staying portion can be lowered.</p> |
