PURPOSE: To manufacture a channel box in which corrosion resistance and creep deformation characteristics are optimized by using a Zr alloy containing specific amounts of Nb, Sn, and Mo and also specifying hot rolling temp., temp. of annealing between cold working stages, hardening temp., and heat-treatment conditions after assembly by welding.
CONSTITUTION: A refined ingot of an alloy having a composition consisting of, by weight, 0.5W2.5% Nb, 0.5W2.0% Sn, 0.1W1.0% Mo, and the balance Zn is forged at a temp. in a β-phase temp. region. The resulting forged stock is heated up to a temp. in the β-phase temp. region again and cooled rapidly to undergo solution heat treatment. Subsequently, the above stock is hot-rolled at about 650W750°C and subjected to alternate repetition of cold rolling and annealing at about 550W650°C, which is then heated up to about 790W870≤ in the (α+β)-phase temp. range, cooled rapidly, and subjected to final cold rolling and bending. Successively, a square-shaped cylinder is formed by means of welding, by which a channel box for nuclear reactor fuel assembly is prepared. After assembly by welding, stress is applied and heat treatment is then applied to the above channel box at about 400W650°C in the α-phase temp. range. By this method, the channel box having high strength and excellent in corrosion resistance can be manufactured.
| JPS61170535 | FUEL CLADDING PIPE FOR NUCLEAR REACTOR AND ITS MANUFACTURE |
| WO/2011/159596 | TIN-CONTAINING AMORPHOUS ALLOY |
| WO/2022/153034 | METHOD OF ADDITIVE MANUFACTURING |
Takase, Iwao
Kanno, Masayoshi
Kuniya, Jiro
Shinpo, Katsutoshi
Maki, Hideo
