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Zirconium alloy composition having excellent corrosion resistance for nuclear applications and method of preparing the same

A corrosion-resistant, zirconium alloy technology, used in nuclear engineering, reactors, nuclear power generation, etc., can solve problems such as increasing the serious corrosion of nuclear fuel

Active Publication Date: 2008-06-11
KEPCO NUCLEAR FUEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case where conventional zirconium alloy-2 or zirconium alloy-4 is used as the material for the nuclear fuel cladding tube, the problem that the nuclear fuel is severely corroded increases

Method used

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  • Zirconium alloy composition having excellent corrosion resistance for nuclear applications and method of preparing the same
  • Zirconium alloy composition having excellent corrosion resistance for nuclear applications and method of preparing the same
  • Zirconium alloy composition having excellent corrosion resistance for nuclear applications and method of preparing the same

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preparation example Construction

[0041] Typical methods known in the art can be used to prepare the zirconium alloy composition of the present invention, and its preparation method preferably includes the first step of mixing and melting alloying elements to prepare an ingot, which will be prepared in the first step The ingot is heat-treated in the β-zone and the second step of cooling it, the ingot heat-treated and cooled in the second step is subjected to the third step of hot rolling and the ingot treated in the third step is subjected to cold rolling And heat treatment, thereby preparing the fourth step of zirconium alloy. After the cold rolling in the fourth step, a final heat treatment may also be included.

[0042] Hereinafter, the preparation method of the present invention will be described step by step in detail.

[0043] The first step is a process of mixing alloying elements at a predetermined ratio and melting them, thereby preparing an ingot.

[0044] The ingot is preferably prepared using a v...

Embodiment 1

[0055] The preparation of zirconium alloy

[0056] (1) Preparation of ingot

[0057] A zirconium alloy composition comprising 1.58 wt. % niobium, 0.05 wt. % iron, 0.01 wt. % silicon, 0.01 wt. % carbon and 0.13 wt. % oxygen with the balance zirconium was subjected to VAR to prepare a button-shaped ingots. Also, reactor-grade zirconium sponge described in ASTM B349 was used as zirconium, and the alloying elements had a high purity equal to or higher than 99.99%. In addition, silicon, carbon, and oxygen are first melted together with zirconium sponge to prepare a master alloy, and then, when the ingot is melted, the master alloy is added in a required amount. To prevent segregation of inclusions or uneven distribution of alloy components, the melting treatment was repeated four times. In addition, in order to prevent oxidation during melt processing, the vacuum state in the chamber is kept at 1×10 -5 Torr, inject high-purity argon gas with 99.99%, and apply a current of 500A...

Embodiment 2

[0067] This example was carried out in the same manner as in Example 1, except that a compound containing 1.51% by weight of niobium, 0.09% by weight of iron, 0.01% by weight of silicon, 0.01% by weight of carbon, and 0.13% by weight of oxygen was used, And a zirconium alloy composition with the balance being zirconium.

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PUM

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Abstract

The present invention relates to a zirconium alloy composition having excellent corrosion resistance for nuclear applications and a method of preparing the same. The zirconium alloy composition having excellent corrosion resistance for nuclear applications includes 1.3~2.0 wt% of niobium, 0.05~0.18 wt% of iron, 0.008~0.012 wt% of silicon, 0.008~0.012 wt% of carbon, and 0.1~0.16 wt% of oxygen, with the balance being zirconium, or includes 2.8~3.5 wt% of niobium, 0.2~0.7 wt% of at least one of iron and copper, 0.008~0.012 wt% of silicon, 0.008~0.012 wt% of carbon, and 0.1~0.16 wt% of oxygen, with the balance being zirconium. The present invention further relates to a method of preparing the zirconium alloy composition as described above, as well as high burn-up nuclear fuel cladding tubes, nuclear fuel assembly support grids and structural components of nuclear power plants made therefrom. The invention further relates to a method of preparing a zirconium alloy composition as described above, as well as high burn-up nuclear fuel cladding tubes, nuclear fuel assembly support grids and structural components of nuclear power plants made therefrom.

Description

technical field [0001] The present invention relates to a zirconium alloy composition having excellent corrosion resistance for nuclear applications and a method for preparing the zirconium alloy composition. Background technique [0002] During the past few decades, zirconium alloys with small neutron-absorbing cross-sections and excellent corrosion resistance and mechanical properties have been widely used as nuclear fuel cladding tubes in pressurized water reactors (PWRs) and boiling water reactors (BWRs), Materials for nuclear fuel assembly support grids and structural components. Among the zirconium alloys developed so far, particularly useful is zirconium alloy-2 (1.20 to 1.70% by weight tin, 0.07 to 0.20% by weight) containing tin (Sn), iron (Fe), chromium (Cr) and nickel (Ni). % iron, 0.05-1.15% by weight of chromium, 0.03-0.08% by weight of nickel, 900-1500ppm of oxygen and the rest of zirconium) and zirconium alloy-4 (1.20-1.70% by weight of tin, 0.18-0.24% by wei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C16/00C22C1/02C22F1/18
CPCG21C3/07C22F1/186Y02E30/40C22C16/00Y02E30/30
Inventor 郑龙焕白种爀催秉权李明镐朴相允朴政容金埈焕金铉佶
Owner KEPCO NUCLEAR FUEL CO LTD
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