Nuclear fuel sintered body having excellent impact resistance
An impact resistance, nuclear fuel technology, applied in the direction of fuel elements, reactor fuel elements, reactor fuel materials, etc., can solve the problems of different specifications, different powder characteristics, high cost, etc., and achieve the effect of small damage and excellent impact resistance.
Active Publication Date: 2020-09-11
KEPCO NUCLEAR FUEL CO LTD
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Problems solved by technology
[0013] In addition, in order to improve the manufacturing process of sintered pellets, which has been in a stable stage of technology abroad, and directly introduce the automatic detection system of sintered pellets to Korea, but the powder characteristics of sintered pellets used abroad and in Korea are different, and the The specifications are different from each other, and considering that revalidation of in-reactor performance is crucial for domestic nuclear power plants in Korea, direct introduction of foreign technology requires domestic process optimization, which may again be costly
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[0054] In order to explain the embodiments according to the concept of the present invention, descriptions of specific structures and functions presented in the embodiments of the present invention are exemplarily given, and other embodiments according to the concept of the present invention may be implemented in different forms. Furthermore, it should not be construed as being limited to the embodiments described in this specification, but should be understood as including all modifications, equivalents, or substitutions included within the idea and technical scope of the present invention.
[0055] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0056] The nuclear fuel sintered pellets with excellent impact resistance of the present invention are made of UO 2 Cylindrical sintered pellets made of powder with a height of 9-13 mm and a horizontal section diameter of 8-8.5 mm.
[0057] specifically, Figure 1a As shown, ...
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Abstract
The present invention relates to a sintered body in a cylindrical shape manufactured by UO2 powder, the sintered body consisting of a dish (10) having both ends of a cylindrical shape formed by spherical grooves, wherein the centers of the both end surfaces have a constant curved surface; a shoulder (20) circularly formed along the rim of the dish (10) having a constant width, which is perpendicular to the cylindrical shape; and a chamfer (30) formed as a chamfered edge along the rim of the shoulder (20). Provided is a nuclear fuel sintered body having excellent impact resistance, wherein thewidth (SW) of the shoulder (20) is 0.20 mm to 0.80 mm and the angle between the chamfer (30) and the horizontal plane is 14 degrees to 18 degrees, thereby enhancing the impact strength of the sinteredbody as the shape of the sintered body is improved, so as to minimize the Pellet-Clad Mechanical Interaction (PCMI) damage by means of a missing pellet surface (MPS).
Description
technical field [0001] The present invention relates to a manufacturing method of a nuclear fuel molded body and its sintered pellets and a nuclear fuel sintered pellet made using the fuel molded body, in particular to a nuclear fuel molded body with excellent impact fracture resistance and the manufacture of its sintered pellets The method, and the nuclear fuel sintered pellets prepared by using the fuel shaped body. Background technique [0002] Since the zirconium-based alloy Zircaloy has excellent corrosion resistance to most organic acids, inorganic acids, strong alkalis and molten salts, it is used in special heat-exchanger columns, reactors, pumps and valves It is used as a high-quality material in the chemical industry and other fields. In addition, in most nuclear reactors currently in operation, zirconium alloys (Zircaloy) are widely used as nuclear fuel cladding and core structure materials, which is due to the small thermal neutron absorption cross section of zi...
Claims
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IPC IPC(8): G21C3/04C04B35/10C04B38/06
CPCY02E30/30G21C3/42G21C3/62C04B35/51C04B2235/3224C04B2235/94C04B2235/945B32B18/00C04B2237/84C04B2237/34G21C3/045G21C21/02G21C3/048G21C3/04C04B35/10C04B38/06
Inventor 羅年洙崔敏英林光荣李昇宰郑泰植睦用均柳钟盛
Owner KEPCO NUCLEAR FUEL CO LTD