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Discussion Topic 1: Rank top ten severe accidents in energy sector (Aberfan Disaster)

(1)    What were the
physical/technical circumstances that led to the accident?

The spoil tips produced by the mining process were placed on top
of a layer of porous sandstone that housed a number of underground springs. On
the lead up to the disaster it had been raining heavily for days which caused approximately
3-6 meters of the spoil tip to subside.

(2)    What were the main
underlying causes?

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