Patent Number: 
Section: claims

1. A method for disposal of intermediate and low level radioactive waste, the method comprising:a primary treatment step of turning the radioactive waste into a radioactive waste (hereafter referred to as the “primary treated waste”) which has a radiation level equal to or less than a reference value via a radiation shielding agent composed of or predominantly composed of a Ca-based inorganic compound; and a secondary treatment step of heating to melt the primary treated waste and thereafter cool the same to glass granules, and then sealing radioactive nuclides in the glass nuclides, the method being characterized in that in the secondary treatment step, the primary treated waste to which a fusing agent and/or glass powder having an upper slow cooling temperature of 550° C. or less is added is heated and melted at 750 to 1050° C. 2. The method for disposal of radioactive waste according to claim 1, characterized in that the radiation shielding agent is composed of discarded pulverized seashells and a binder. 3. The method for disposal of radioactive waste according to claim 2, characterized in that the binder is a Ca-based inorganic compound. 4. The method for disposal of radioactive waste according to claim 1, characterized in that the fusing agent is boric acid, borax, or frit. 5. The method for disposal of radioactive waste according to claim 1, characterized in that the glass powder is composed of lead glass or soda lime glass. 6. The method for disposal of radioactive waste according to claim 1, characterized in that the primary treated waste is of a primary treated waste single type obtained by kneading the radiation shielding agent and a radioactive waste kneadable with the radiation shielding agent with water added thereto, and thereafter by solidifying the resulting mixture. 7. The method for disposal of radioactive waste according to claim 6, characterized in that the primary treated waste is of a primary treated waste complex type which is obtained by covering the primary treated waste single type with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder. 8. The method for disposal of radioactive waste according to claim 1, characterized in that the primary treated waste is a primary treated waste complex type which is obtained by covering the radioactive waste with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder. 9. The method for disposal of radioactive waste according to claim 8, characterized in that the radiation shield is a radiation shielded container. 10. The method for disposal of radioactive waste according to claim 7, characterized in that the radiation shield is a radiation shielded container. 11. The method for disposal of radioactive waste according to claim 2, characterized in that the fusing agent is boric acid, borax, or frit. 12. The method for disposal of radioactive waste according to claim 3, characterized in that the fusing agent is boric acid, borax, or frit. 13. The method for disposal of radioactive waste according to claim 2, characterized in that the glass powder is composed of lead glass or soda lime glass. 14. The method for disposal of radioactive waste according to claim 3, characterized in that the glass powder is composed of lead glass or soda lime glass. 15. The method for disposal of radioactive waste according to claim 2, characterized in that the primary treated waste is of a primary treated waste single type obtained by kneading the radiation shielding agent and a radioactive waste kneadable with the radiation shielding agent with water added thereto, and thereafter by solidifying the resulting mixture. 16. The method for disposal of radioactive waste according to claim 3, characterized in that the primary treated waste is of a primary treated waste single type obtained by kneading the radiation shielding agent and a radioactive waste kneadable with the radiation shielding agent with water added thereto, and thereafter by solidifying the resulting mixture. 17. The method for disposal of radioactive waste according to claim 15, characterized in that the primary treated waste is of a primary treated waste complex type which is obtained by covering the primary treated waste single type with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder. 18. The method for disposal of radioactive waste according to claim 16, characterized in that the primary treated waste is of a primary treated waste complex type which is obtained by covering the primary treated waste single type with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder. 19. The method for disposal of radioactive waste according to claim 2, characterized in that the primary treated waste is a primary treated waste complex type which is obtained by covering the radioactive waste with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder. 20. The method for disposal of radioactive waste according to claim 3, characterized in that the primary treated waste is a primary treated waste complex type which is obtained by covering the radioactive waste with a radiation shield, the radiation shield being obtained by kneading a radiation shielding agent with water and then solidifying the resulting mixture, the radiation shielding agent being composed of the discarded pulverized seashells and the binder.