Kirin destroyed a mountain or part of it and Itachi's V2 Susanoo took on most of the blast while Itachi was only mildly burnt and was knocked onto the ground.
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^ That is the Susanoo that took on Kirin, as you can clearly see it doesn't have Yata Mirror so no Yata did not block Kirin.
Bijuu Dama's are normally mountain busters, they can vaporize Mountains. Factor in the difference between Itachi's V2 Susanoo and Madara's PS, you will come to the conclusion that PS won't completely shatter after only one Bijuu Dama. Not to mention it towers over any Bijuu in this series and is the second biggest thing in the series besides the Juubi (Current Form). As it is a Susanoo it's defense and offense increase with its size as we have clearly seen in the series, the bigger the better with Susanoo. Also, Susanoo was
made for defense.