Cladding:

Cladding is used to gives surface protection for retaining fission products and minimizing corrosion. A Cladding  is also  used  to  hold  pelletized  fuel  to give  the  needs  physical configuration.

Mechanical properties, impact strength, tensile strength, such as ductility, and creep, must be adequate for the operating conditions of the reactor core. Simple of fabrication is also important. It is desirable which ordinary fabrication generates be applicable in fabricating the desired shape. A cladding must have a high corrosion resistance to its operating environment. That must have a high melting temperature to withstand abnormal operating conditions such as high temperature transients. Thermal  conductivity  should  be  high  to  minimize  thermal  stresses  arising  from temperature dissimilarity, and the coefficient of expansion should be low or well-matched along with in which of other materials. A cladding material should not be susceptible to radiation damage.