Digital BW, The Print

This is probably a bit off-topic but hopefully someone can offer some advice . I seem to be getting fairly grainy results from B&W negs , at A4 and A3+ , even when using fine grained film[e.g.Delta100] which does not show much grain on the negs . Presumably I am introducing grain during scanning or something? Any ideas why this would happen and what I should do to avoid it?? I'm using a decent scanner [Nikon LS4000] and scanning at max res.....?
Someone suggested scanning at lower res. but then , presumably , one would have problems making a decent sized print.
Any help appreciated
Steve



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