Welding structure for welding inner cladding and end plug of fuel rod

A technology for welding structures and fuel rods, which is used in fuel elements, greenhouse gas reduction, nuclear power generation, etc., can solve problems such as increased flow resistance, clogging of annular fuel inner flow channels, and reduced coolant inner tube flow, etc. Safety, reduce the probability of damage to fuel rods, and ensure the effect of welding quality

Pending Publication Date: 2019-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0002] Butt welding is usually used for cladding and end plug welding, which is easy to form residue protrusions at the welding position, which will block the inner flow channel of the annular fuel, increase the flow resistance, reduce the flow rate of the inner coolant pipe, and deteriorate the heat transfer conditions of the annular fuel. For slender fuel rods, it is not easy to machine to eliminate the end protrusion, and it may increase the risk of damage to the fuel rod
Due to the slender structure of the annular fuel rod, it is impossible to conduct weld inspection according to the non-destructive ray inspection standard when the non-destructive inspection is carried out after the cladding and the end are welded, and it is difficult to guarantee the quality of the weld seam

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  • Welding structure for welding inner cladding and end plug of fuel rod

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[0020] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0021] The welding structure is used for welding the inner cladding and the end plug of the annular fuel rod, and includes an inner cladding welding step 1, a mother pipe 2 and an outer cladding welding step 3, which form a hollow through-tube structure. The inner shell welding step 1, the mother pipe 2 and the outer shell welding step 3 are integrally formed. The step of the inner cladding welding step 1 is an annular protrusion along the inner diameter direction for welding with the inner cladding of the annular fuel rod. The height of the annular protrusion of the inner cladding welding step 1 is the same as the thickness of the inner cladding of the annular fuel rod; The step of the welding step 3 is an annular protrusion along the outer diameter direction for welding with the annular fuel rod outer shell, and the height of the annular protrusion of

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Abstract

The invention belongs to the technical field of nuclear fuels, and concretely relates to a welding structure for welding the inner cladding and the end plug of a fuel rod. The welding structure includes an inner cladding welding step, a mother tube and an outer cladding welding step, and the three parts form a hollow through tube structure; the step of the inner cladding welding step is an annularprojection along the inner diameter direction and is used for being welded to the inner cladding of the annular fuel rod; and the step of the outer cladding welding step is an annular projection along the outer diameter direction, and is used for being welded to the outer cladding of the annular fuel rod. A welding point is arranged in the central hole of the annular fuel rod through the steps ofthe inner cladding and end plug welding structure, so projections affecting a channel for a coolant to flow in are difficult to form, thereby machining is not needed after the completion of welding,and the damage probability of the fuel rod is reduced. The inner cladding and end plug welding manner of the welding structure meets nondestructive test standards of welds, so the welding quality is ensured by radiographic testing, and the safety of the annular fuel rod is improved. The welding structure is suitable for the cladding with an internal diameter of 5-15 mm and the end plug.

Description

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Claims

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Application Information

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Owner CHINA INSTITUTE OF ATOMIC ENERGY
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