Howard and Hannah decide to resolve a contract dispute

Howard and Hannah decide to resolve a contract dispute through arbitration. They select their arbitrator through a private service. The arbitrator returns a significant reward for Howard. The weekend after receiving the notice of the award, Hannah finds out from one of Howard’s co-workers that, although the arbitrator and Howard acted as though they did not know each other, they had actually been college roommates. Does Hannah have any basis for getting the award set aside?