Korea Atomic Energy Research Institute

Other

Korea Hydro Nuclear Power Co., Ltd.

Korea Electric Power Corporation

Yong Hwan Jeong

Jong Hyuk Baek

Youn Ho Jung

Kyeong Ho Kim

Sang Yoon Park

Myung Ho Lee

Byoung Kwon Choi

Cheol Nam

Il Hiun Kuk

Byong Kwon Choi

Sun-Jae Kim

Jeong Yong Park

Sun Jae Kim

Hyun Gil Kim

Jun Hwan Kim

Younho Jung

Soon Dong Park

Myong Ho Lee

A high Fe-containing zirconium composition having excellent corrosion resistance and a preparation method thereof. Specifically, disclosed are a high Fe-containing zirconium composition having excellent corrosion resistance and a preparation method thereof, the composition comprising: 0.5-1.0 wt % iron; 0.25-0.5 wt % chromium; 0.06-0.18 wt % oxygen; at least one element selected from the group consisting of 0.2-0.5 wt % tin, 0.1-0.3 wt % niobium and 0.05-0.3 wt % copper; and the balance of zirconium. The zirconium alloy has excellent corrosion resistance, and thus can be used as a material for nuclear fuel claddings, spacer grids and nuclear reactor core structures in light water reactor and heavy water reactor nuclear power plants.

High Fe contained zirconium alloy compositions having excellent corrosion resistance and preparation method thereof

The present invention relates to a method for manufacturing zirconium-based alloys containing niobium with superior corrosion resistance for use in nuclear fuel rod claddings. The method of this invention comprises melting of the alloy, &#x3b2;-forging, &#x3b2;-quenching, hot-working, vacuum annealing, cold-working, intermediate annealing and final annealing, whereby the niobium concentration in the &#x3b1;-Zr matrix decreases from the supersaturation state to the equilibrium state to improve the corrosion resistance of the alloy. Such zirconium-based alloys containing niobium are usefully applied to nuclear fuel rod cladding of the cores in light water reactors and heavy water reactors.

Method for manufacturing zirconium-based alloys containing niobium for use in nuclear fuel rod cladding

The present invention relates to a zirconium alloy having excellent corrosion resistance and mechanical properties and a method for preparing a nuclear fuel cladding tube by zirconium alloy. More particulary, the present invention is directed to a zirconium alloy comprising Zr-aNb-bSn-cFe-dCr-eCu (a&equals;0.05-0.4 wt %, b&equals;0.3-0.7 wt %, c&equals;0.1-0.4 wt %, d&equals;0-0.2 wt % and e&equals;0.01-0.2 wt %, provided that Nb&plus;Sn&equals;0.35-1.0 wt %), and to a method for preparing a zirconium alloy nuclear fuel cladding tube, comprising melting a metal mixture comprising of the zirconium and alloying elements to obtain ingot, forging the ingot at &bgr; phase range, &bgr;-quenching the forged ingot at 1015-1075&deg; C., hot-working the quenched ingot at 600-650&deg; C., cold-working the hot-worked ingot in three to five passes, with intermediate vacuum annealing and final vacuum annealing the worked ingot at 460-540&deg; C., which can be applied to the core components in a light water and a heavy water atomic reactor type nuclear power plant.

Zirconium alloy having excellent corrosion resistance and mechanical properties for nuclear fuel cladding tube

Disclosed is a method for manufacturing a tube and a sheet of niobium-containing zirconium alloys for the high burn-up nuclear fuel. The method comprises melting Nb-added zirconium alloy to ingot; forging the ingot at &bgr; phase range; &bgr;-quenching the forged ingot after solution heat-treatment at 1015-1075&deg; C.; hot-working the quenched ingot at 600-650&deg; C.; cold-working the hot-worked ingot in three to five passes, with intermediate vacuum annealing; and final vacuum annealing the cold-worked ingot at 440-600&deg; C., wherein temperatures of intermediate vacuum annealing and final vacuum annealing after &bgr;-quenching are changed so as to attain the condition under which precipitates in the alloy matrix are limited to an average diameter of 80 nm or smaller and the accumulated annealing parameter (&Sgr; A) is limited to 1.0&times;10 hr or lower.

Method for manufacturing a tube and a sheet of niobium-containing zirconium alloy for a high burn-up nuclear fuel

Zirconium alloy having high corrosion resistance and high strength

Niobium-containing zirconium alloy for nuclear fuel claddings

A method for production of mono-dispersed and crystalline titanium dioxide ultra fine powders comprises preparing an aqueous titanyl chloride solution, diluting the aqueous titanyl chloride solution to a concentration of between about 0.2 to 1.2 mole and heating the diluted aqueous titanyl chloride solution and maintaining the solution in a temperature range of between 15 to 155.degree. C. to precipitate titanium dioxide. The aqueous titanyl chloride solution is prepared by adding ice pieces of distilled water or icing distilled water to undiluted titanium tetrachloride.

Method for production of mono-dispersed and crystalline TiO.sub.2

The present invention is directed to an advanced zirconium alloy having superior corrosion resistance and high strength suitable for fuel rod cladding, spacer grids and other structural components in a reactor core of nuclear power plants.

Composition of zirconium alloy having low corrosion rate and high

The invention presented herein relates to a zirconium alloy with superior corrosion resistance and high strength for use in fuel rod claddings, spacer grids and structural components as used in reactor core of light water and heavy water nuclear power plant. The zirconium alloy of this invention with superior corrosion resistance and high strength comprises an alloy composition as follows:

Composition of zirconium alloy having high corrosion resistance and high

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Taejon-si, South Korea

Yong Hwan Jeong