We propose to build self-repair capability into the concrete containers of radioactive waste with embedded superelastic (shape-memory) wires. The input energy of destructive forces (earthquakes, impacts, explosions, etc.) will be absorbed by the superelastic wires through plastic deformations associated with phase transformation. Subsequently, the tendency of superelastic wires to forcefully restore their original length through returning to the parent phase will make the absorbed energy available for self-repair. In Phase I research we will determine the technical feasibility and commercial viability of the technology. For this purpose, we will select the composition and thermomechanical processing condition of the superelastic alloy to achieve high recoverable strains and recovery stresses which are stable under severe conditions over very long periods. We will then design simple concrete systems with embedded superelastic wires to satisfy the requirements of radioactive waste containment and provide self-repair capability and assessment of the competitive positions of the new system versus existing ones will be the final steps in Phase I research.
Anticipated Results:Radioactive waste containers and nuclear power plants are some vital concrete systems which can use the self-repair capability offered by the technology. Radioactive waste containers may experience unpredicted damaging effects (earthquakes, impacts, explosions, etc.) over their very long service lives, and their failures are highly consequential. The technology thus adds to the safety of radioactive waste management, which implies great social benefits. Existing systems can also be retrofitted using the technology.
