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Study on Simulation for Expanding and Welding Tube-to-Tubesheet and Joint Performance for the AP1000 Steam Generator of Nuclear Power

Author: ZuoZongBao
Tutor: WangGuoZhen
School: East China University of Science and Technology
Course: Chemical Process Equipment
Keywords: Tube sheet Expanded joint Welding AP1000 The steam generator
CLC: TL353.13
Type: Master's thesis
Year: 2011
Downloads: 237
Quote: 1
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Abstract


Paper with three-dimensional finite element numerical simulation method, for the third generation AP1000 nuclear power steam generator tube / tube plate Expansion mechanical process, the welding process and joint performance in the room temperature and operating conditions. The main research work and the results obtained are as follows: (1) AP1000 and AP600 nuclear power steam generator tube and tube sheet joints Expansion pressure of expansive process and the pull-off process was simulated tube / pipe The board interface residual contact pressure and pipe transition area residual stress distribution law; residual contact pressure pipe thinning and connector pull-off strength and expansion of relations on the pressure. The results show that the residual contact pressure and tube thinning rate increases linearly with the basic trend: with the increase in the pressure of expanded joint, joints, pipe pull-off force rendering sub-increasing trend. (2) the use of thermal - mechanical coupled numerical methods tube plate surfacing layer, the heat source radius and welding process on pipe / tube sheet welding joints residual stress. The distribution of residual stress of welded joints and welding parameters of its distribution. The results showed that: after the completion of the welded joints, the root of the weld appear larger stress concentration; radial path along the surface of the tube sheet, radial and circumferential residual stress are first increases and then decreases, and finally tends to zero, and joint welding residual stress in the radial range; surfacing layer of the surface of the tube sheet can effectively reduce the residual stress of welded joints; welding residual stress decreases with the increase in the length of the welding heat source Axle; with the welding current increase the welding residual stress increases. (3) study the tube / tube sheet joint performance in service conditions, temperature loads, pressure loads and the two coupling conditions influence of the joint residual contact pressure and pull-off strength. The results showed that: working pressure load is applied to the connector interface can effectively improve the residual contact pressure, the pull-off strength and tightness; working temperature load is applied to reduce the the residue contact pressure of a joint interface and the pull-off strength and tightness, affecting the joints service safety and reliability; joint performance by coupling case temperature load, determined by the combined effect of the pressure load. Ensure normal working conditions, the primary side fluid temperature should be controlled not up to excessive volatility, the control side fluid pressure is not excessive volatility down, so as to avoid the joint performance degradation, resulting in joint leakage accidents.

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CLC: > Industrial Technology > Nuclear technology > Engineering of Nuclear Reactors > Reactor components and the design, manufacture > Circuit and its equipment > Thermal equipment and cooling system > A steam generator and a heat exchanger
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