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How is High Level solidified nuclear wastes (HLW) stored?

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How is High Level solidified nuclear wastes (HLW) stored?

(a) Concrete tanks

(b) Canisters

(c) Packed rock salt

(d) Soil bins

The question was posed to me at a job interview.

My query is from Disposal of Nuclear Waste topic in chapter Nuclear Power Plant of Energy Engineering

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Best answer
The correct answer is (b) Canisters

Best explanation: The solidified waste is placed in canisters that are stored in holes formation for thousands of years. The solidified waste is placed in canisters that are stored in holes drilled in rock salt with a spacing of 10 m to allow efficient dissipation of energy without exceeding temperature limits of either canister or salt. Each canister requires 100 m^2 of salt for cooling.

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