Because of the fission process that consumes the fuels, the old fuel rods must be changed periodically to fresh ones (this period is called a cycle). However, only a part of the assemblies (typically one-third) are removed since the fuel depletion is not spatially uniform.
In fertilization, the sperm and egg both contain one set of chromosomes. the father (sperm) and one from the mother (egg). In SCNT, the egg cell's single set of chromosomes is removed. chromosomes. come from the somatic cell.
Another possible use of reproductive cloning is to create a child that is a tissue match for a sick sibling. The stem cells from the umbilical cord blood or from the bone marrow of the cloned child could be used to treat the diseased sibling.