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Nuclear waste is unlikely to be the problem with nuclear power for Senegal. I am sure that French companies will be happy to reprocess the Senegalese spent nuclear fuel. In fact, my guess would be that the international community would prefer if France took care of the fuel. Or maybe they will end with ties to the South Africans. I don't pretend to know enough of African politics to hazard a guess on which is more likely.
Regardless, from what little I know of Senegal, dealing with nuclear waste won't be their biggest problem. Developing and importing technical know-how are bigger issues, but if the price is right I am sure they can find people willing to it.