Cold fission and cluster decay processes are studied for ^234,236,238U nuclei in the super-asymmetric mass region of exotic cluster radioactivity. The idea is to see whether the clusters already observed as cluster decays (here for ^234,236U parents) could also be observed via the cold fission process. Our calculations are made on the well accepted quantum mechanical fragmentation theory and the saddle-point fission model and the preformed-cluster model that are also based on this theory.