Prior to its devastation by atomics, Corrin was a radiation-prone world, due to the red giant status of its star. It was barely habitable to humans, but became a favored location for thinking machines after the rise of Omnius. Indeed, after Earth was reduced to a radioactive husk by the League of Nobles, Corrin became the new location of Omnius Prime.
Role During the Jihad
As a result of the Great Purge Omnius was confined to the planet for several decades, during which time the planet was mined of all its natural resources. It was eventually turned into a radioactive wasteland by the Army of the Jihad during the Battle of Corrin.
Behind the Scenes
In the Original Dune novels Corrin is mentioned in passing, primarily because of the imfamous Battle of Corrin that was fought in the star system. It was during this battle that House Corrino emerged as the ruling house of the Imperium.