Finland is in the process of creating the world's first permanent nuclear-waste repository, a system of underground tunnels at Olkiluoto that is expected to last 100,000 years. The nuclear waste will be secured by bedrock, steel and concrete, with the waste fuel rods stored in corrosion-resistant copper canisters with 2-inch-thick walls. The canisters will then be stored in bentonite clay that will protect them against geological movement and prevent liquid pooling.

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