Now I can see it. The petals look a little full for a white intermedia and that much yellow is not present in the lip of the OrchidWiz photos for white intermedia's. It could be a cross with it tho. Very nice bloom.
It looks a lot like a classic old Catt hybrid used for corsages, called Henrietta Japhet. It was so prominent in the corsage industry at one time that the general type was commonly referred to as "Japhet" even if it was some totally unrelated hybrid. Henrietta Japhet is mostly C. mossiae and C. loddigesii, but any of the big Cattleya labiata types crossed with a bifoliate like intermedia or loddigesii could look a lot like this in the alba phase. A pure bifoliate would be very unlikely to have this lip.