Use sys.columns rather than the information_schema views.
select *
from sys.columns c
where cast(objectpropertyex(c.object_id, 'BaseType') as varchar(2)) = 'u' and c.is_nullable = 1 and c.is_computed = 0
SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.