Coal ash is commonly used in cement [1]. I would suspect the nuclear waste is being encased with cement to prevent its leakage with of course the punchline bein

Coal ash is commonly used in cement [1]. I would suspect the nuclear waste is being encased with cement to prevent its leakage with of course the punchline being that the encasement is more radioactive than its contents. [1]: https://en.wikipedia.org/wiki/Coal_combustion_products https://en.wikipedia.org/wiki/Coal_combustion_products