1. The proposed solution involves encasing spent nuclear fuel in copper and iron double-layered disposal containers and placing them in a 500m-deep granite rock formation. 2. The solution emphasizes safety and economic efficiency, with the disposal system designed to meet regulatory safety targets and ensure retrievability. 3. The society suggests using thinner copper containers through 3D printing and optimizing the number of fuel bundles and spacing within disposal boreholes to reduce costs and footprint.