SQL Server Reporting Services (SSRS) is not cluster aware - it isn't possible for the web front end of SSRS to fail over with a cluster. It is, however, possible to install an instance of SSRS onto each node of a cluster, and then point each instance to a shared, clustered ReportServer database using the Scale Out functionality of SSRS. This option is only available in Enterprise Edition.
However, it is not recommended to install SSRS onto a SQL Server cluster, due to competition between SQL Server and SSRS for resources etc.
More information here: http://blogs.msdn.com/b/psssql/archive/2010/05/27/reporting-services-scale-out-and-clusters.aspx
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