Storing method of radioactive materials in concrete containing absorbent

Abstract

To provide a storage method of radioactive materials in concrete containing absorbent capable of solving the problems at the Fukushima Daiichi Nuclear Power Plant of the Tokyo Electric Power Company that an international agreement is now required for releasing treated water containing tritium and low concentrations of radionuclides into the ocean, as ALPS cannot treat the contaminated water, and further, uncollected contaminated water is being released directly into the ocean from the seawall, posing a potential threat.SOLUTION: After the radioactive materials are adsorbed onto coarse aggregate sintered with radioactive material adsorbent, and the coarse aggregate, tritium-containing water, fine aggregate, and cement are mixed, and the concrete is stored underground, underwater, or in the sea within a seawall. In order to isolate the soil on the sea side and land side of a seawall in the bay that has been contaminated by the leakage of contaminated water or contaminated water from under the seawall into the ocean, a caisson revetment is built around the bay. In the caisson, contaminated water or soil on the sea side and land side of the revetment is allowed to be absorbed into the coarse aggregate made of sintered radioactive material absorbent. The coarse aggregate is mixed with water containing tritium, fine aggregate, and cement to form concrete, and similarly, the concrete is poured between the bay and the caisson embankment.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention is applied to the conservation of contaminated water and treated water generated by the Fukushima Daiichi Nuclear Power Plant due to an accident.

[0002] The present invention also isolates bays contaminated by contaminated water generated by the Fukushima Daiichi Nuclear Power Plant as a result of the accident. [Background technology] The contaminated water generated by the Fukushima Daiichi Nuclear Power Plant is purified using ALPS, but tritium has not been removed. Other nuclides also remain in significant amounts, even if they are below the standard levels. In addition, contaminated water that cannot be collected through seawalls is being discharged directly into the ocean. [Prior art documents]

[0003] None

[0004] [Patent documents] [Patent documents] Patent No. 6825193 Radioactive material adsorbent and its manufacturing method Summary of the Invention Radioactive materials are adsorbed onto coarse aggregate sintered with a radioactive material adsorbent, and the coarse aggregate is mixed with water containing tritium, fine aggregate, and cement to create concrete, which is then stored underground, underwater, or in the sea within a seawall. In order to isolate the soil on the seaward side and landward side of the seawall in the bay that has become contaminated when contaminated water or contaminated water leaks out into the ocean from under the seawall, a caisson seawall will be built surrounding the bay, and inside the caisson, coarse aggregate sintered with a radioactive material adsorbent will be used to adsorb the contaminated water or the soil on the seaward side and landward side of the seawall. Concrete made by mixing the coarse aggregate with water containing tritium, fine aggregate and cement will be poured, and similar concrete will be poured between the bay and the caisson seawall.

[0005] [Problem to be solved by the invention]

[0006] To adsorb tritium.

[0007] Store the sorbent permanently.

[0008] Radioactive materials do not dissolve from the adsorbent even in seawater or underwater. [Means for solving the problem]

[0009] Radioactive materials are adsorbed onto coarse aggregate sintered with a radioactive material adsorbent, and the coarse aggregate is mixed with water containing tritium, fine aggregate, and cement to create concrete, which is then stored underground, underwater, or in the sea within a seawall. In order to isolate the soil on the seaward side and landward side of the seawall in the bay that has become contaminated when contaminated water or contaminated water leaks out into the ocean from under the seawall, a caisson seawall will be built surrounding the bay, and inside the caisson, coarse aggregate sintered with a radioactive material adsorbent will be used to adsorb the contaminated water or the soil on the seaward side and landward side of the seawall. Concrete made by mixing the coarse aggregate with water containing tritium, fine aggregate and cement will be poured, and similar concrete will be poured between the bay and the caisson seawall. Effect of the Invention

[0010] The ability to adsorb water containing tritium as crystal water in concrete.

[0011] The radioactive material adsorbent can adsorb substances other than tritium contained in the treated water.

[0012] Capable of permanently storing radioactive materials, including tritium.

[0013] Isolate the soil on the sea side and land side of the seawall within the bay. [Brief description of the drawings]

[0014] [Figure 1]Figure 1 shows the basic storage method of the present invention. A revetment 3 is made of caissons 2 filled with concrete 1 containing treated water in order to store contaminated materials within the revetment. The foundation of the revetment 3 is made of foundation rubble 8, and on the seaward side of this is placed an asphalt mat 5 to prevent scouring, and wave-dissipating blocks 4 are placed on top of that. On the landward side of this is placed an asphalt mat 6 to prevent suction. Friction-increasing asphalt mats 7 are placed in various places around the concrete 1 containing the treated water in the caissons 2 to increase friction and waterproof the structure. Concrete 1 containing treated water is poured between the caisson revetment 2 and the coast. [Diagram 2] Figure 2 shows an example of applying the present invention to the Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Company. A new caisson revetment 10 is surrounded around an existing wharf 9. Unit 1, Unit 2, Unit 3, and Unit 4 buildings are located on land 16. A new wharf 17 is installed next to the caisson revetment, allowing ships to enter and leave the port from the sea 15. [Industrial Applicability]

[0015] None [Explanation of symbols]

[0016] 1. Concrete containing treated water 2. Caisson 3. Seawall 4. Wave-dissipating blocks 5. Asphalt mats to prevent scouring 6. Asphalt mat to prevent suction 7. Asphalt mats for increasing friction 8. Foundation rubble 9. Existing wharf 10. Newly constructed caisson revetment 11. Unit 1 building 12. Unit 2 building 13. Unit 3 building 14. Unit 4 building 15. The Sea 16. Land 17. New Pier

Claims

1. Radioactive materials are adsorbed onto coarse aggregate sintered with a radioactive material adsorbent, and the coarse aggregate is mixed with water containing tritium, fine aggregate, and cement to create concrete, which is then poured underground, underwater, or into the sea within a revetment.

2. In order to isolate the soil on the seaward side and landward side of the seawall in the bay that has become contaminated when contaminated water or contaminated water leaks out into the ocean from under the seawall, a caisson seawall will be built surrounding the bay, and inside the caisson, coarse aggregate sintered with a radioactive material adsorbent will be used to adsorb the contaminated water or the soil on the seaward side and landward side of the seawall. Concrete made by mixing the coarse aggregate with water containing tritium, fine aggregate and cement will be poured, and similar concrete will be poured between the bay and the caisson seawall.

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