The invention concerns a method of producing a cladding tube for nuclear
fuel for a nuclear boiling water reactor. According to the method, a tube
is formed which comprises an outer cylindrical component (10) mainly
containing zirconium and an inner cylindrical component (20)
metallurgically bonded to the outer component (10), wherein also the
inner component (20) at least mainly contains zirconium. The inner
component (20) has a lower recrystallization temperature than the outer
component (10). The cladding tube is final annealed at a temperature and
during a time such that the inner component (20) substantially completely
recrystallizes and such that the outer component (10) partly
recrystallizes but to a lower extent than the inner component (20). The
invention also concerns a cladding tube, a fuel assembly for a boiling
water reactor as well as the use of a cladding tube.