Finite element simulation of temperature field for AP1000 main pipeline during quenching under different flow rates

doi:10.13251/j.issn.0254-6051.2020.08.028

Abstract

Abstract: A three-dimensional finite element model of AP1000 main pipeline was established by ANSYS finite element analysis software. The heat transfer coefficients of 316LN stainless steel at different water flow rates of 0.3, 0.5, 0.7 and 1.0 m/s were calculated according to the inverse heat conduction method. The temperature field of AP1000 nuclear power main pipeline was simulated by ANSYS. The possibility of cooling to below 427 ℃ within 180 s proposed by Westinghouse company was preliminarily discussed. The results show that when water flow rate increases from 0.3 m/s to 1.0 m/s, the surface heat transfer coefficient of 316LN stainless steel only increases from 3013 W/(m²·℃) to 3560 W/(m²·℃). At different flow rates, the temperature field of main pipeline surface and center decrease with the extension of quenching time. When the water flow rate is 1.0 m/s, the temperature of inner and outer surface of the main pipeline drops very quickly. It can be quenched to below 200 ℃ for 180 s and to room temperature for 600 s. However, the temperatures of main pipeline center (thickness is about 83 mm) and filler neck convex center decrease slowly, only reach about 580 ℃ and 860 ℃ respectively after quenching for 180 s, which failed to meet Westinghouse's requirement of cooling below 427 ℃ within 180 s. All parts of the main pipeline can be cooled to below 427 ℃ after quenching for about 530 s.

Key words: AP1000 main pipeline, 316LN stainless steel, finite element simulation, quenching, temperature field

CLC Number:

TG156.3

Liu Huaying, Peng Xinyuan, Tang Longshu, Li Chao. Finite element simulation of temperature field for AP1000 main pipeline during quenching under different flow rates[J]. Heat Treatment of Metals, 2020, 45(8): 147-151.

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