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AssigneeSiemens Aktiengesellschaft
InventorsFriedrich Garzarolli, Eckard Steinberg
Estimating the term…
A fuel rod has a cladding including a thicker inner layer and a thin outer layer being metallurgically bound thereto. In view of the conditions prevailing on the inside of the cladding tube and the mechanical properties of the entire cladding tube, the inner layer is formed of zircaloy having a comparatively high Sn content and a low Fe and Fe+Cr content. The outer layer also contains virtually only zircaloy constituents, but in view of corrosion, H2 take-up and sensitivity to Li dissolved in the cooling water, the Fe and Fe+Cr content is greater than or at most equal to that of the inner layer, the chosen Sn content is less than 1.3% and the chosen Sn+Fe+Cr content is more than 1.0%. Low failure rates of the cladding tube are thereby achieved even for long service lives.
A fuel rod of a pressurized-water-cooled fuel assembly, comprising a fuel filling, a cladding tube enclosing said fuel filling and including a first thicker inner layer facing toward said fuel filling and being formed of a first zirconium alloy, and a second thinner outer layer being metallurgically bound to said inner layer and being formed of a second zirconium alloy, said two zirconium alloys each containing at least the metals tin, iron and chromium as alloying constituents, and:
A fuel assembly of a pressurized-water reactor, comprising fuel rods each including a fuel filling, a cladding tube enclosing said fuel filling and having a first thicker inner layer facing toward said fuel filling and being formed of a first zirconium alloy, and a second thinner outer layer being metallurgically bound to said inner layer and being formed of a second zirconium alloy, said two zirconium alloys each containing at least the metals tin, iron and chromium as alloying constituents, and:
Dependencies are inferred from the claim text.