Seismic Protection Design and Analysis of Large Passive Emergency Reactor Core Cooling Spherical Vessel

WANG Yuerong; MENG Xianggai; LIANG Wenyuan

doi:10.19554/j.cnki.1001-3563.2026.07.030

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (7) : 266-273. DOI: 10.19554/j.cnki.1001-3563.2026.07.030

Defense Equipment

Seismic Protection Design and Analysis of Large Passive Emergency Reactor Core Cooling Spherical Vessel

WANG Yuerong^*, MENG Xianggai, LIANG Wenyuan

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Abstract

The work aims to carry out structural analysis of large passive emergency reactor core cooling spherical vessels for nuclear power plants, so as to ensure that they can maintain structural integrity under extreme conditions such as earthquakes in nuclear power plants. Based on the initial structure of the equipment, referring to traditional spherical vessels, combined with the waveform characteristics of the seismic response spectrum of the nuclear power plant, the ANSYS finite element software was used for modal analysis, and the natural frequency was adjusted through structural design to avoid the risk of resonance. The upper flexible and lower rigid composite support structure was adopted, which effectively balanced the bearing capacity and seismic energy absorption capacity. The spectral analysis method was used to analyze the seismic performance of the whole equipment, and the stress state of the equipment under various conditions was calculated and evaluated. The optimized structure of the spherical container was determined by modal analysis, and the natural frequency of the equipment was increased to 14.27 Hz. The maximum stress ratio of seismic calculation was 0.74 (abnormal condition), which had a certain safety margin and verified the effectiveness of seismic protection design. The structural analysis method of spherical vessels with nuclear-grade seismic requirements for nuclear power plants is completed. This method provides an important technical reference for seismic protection of large nuclear-grade equipment arranged on high floors of nuclear power plants.

Key words

vessel / model analysis / finite element analysis / equivalent model

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WANG Yuerong, MENG Xianggai, LIANG Wenyuan. Seismic Protection Design and Analysis of Large Passive Emergency Reactor Core Cooling Spherical Vessel[J]. Packaging Engineering. 2026, 47(7): 266-273 https://doi.org/10.19554/j.cnki.1001-3563.2026.07.030

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