Title:
MANUFACTURE OF CHANNEL BOX FOR NUCLEAR REACTOR FUEL ASSEMBLY
Document Type and Number:
Japanese Patent JPH01119650
Kind Code:
A
Abstract:
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, 0.5-2.5% Nb, 0.5-2.0% Sn, 0.1-1.0% Mo, and the balance Zn is forged at a temp. in a beta-phase temp. region. The resulting forged stock is heated up to a temp. in the beta-phase temp. region again and cooled rapidly to undergo solution heat treatment. Subsequently, the above stock is hot-rolled at about 650-750 deg.C and subjected to alternate repetition of cold rolling and annealing at about 550-650 deg.C, which is then heated up to about 790-870<= in the (alpha+beta)-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 400-650 deg.C in the alpha-phase temp. range. By this method, the channel box having high strength and excellent in corrosion resistance can be manufactured.
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Inventors:
INAGAKI MASATOSHI
TAKASE IWAO
KANNO MASAYOSHI
KUNIYA JIRO
SHINPO KATSUTOSHI
MAKI HIDEO
TAKASE IWAO
KANNO MASAYOSHI
KUNIYA JIRO
SHINPO KATSUTOSHI
MAKI HIDEO
Application Number:
JP27743887A
Publication Date:
May 11, 1989
Filing Date:
November 04, 1987
Export Citation:
Assignee:
HITACHI LTD
International Classes:
C22C16/00; C22F1/00; C22F1/18; G21C3/30; G21C3/324; G21C21/00; (IPC1-7): C22C16/00; C22F1/18; G21C3/30; G21C21/00
Attorney, Agent or Firm:
Katsuo Ogawa (2 outside)