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<p>Ensuring the structural and radiational integrity of nuclear power reactor facilities is crucial for operational safety, necessitating a stable mat foundation under both static and seismic conditions. This study evaluates the settlement and tilting of a nuclear reactor mat foundation under seismic loading using numerical analysis in Plaxis 3D. Structural and seismic load parameters from the Rooppur Nuclear Power Plant (RNPP) Project were incorporated into four foundation models: two representing natural soil conditions and two with improved soil properties. Seismic excitations from the Kobe and Loma Prieta earthquakes were applied, considering a peak ground acceleration of 0.33&#xa0;g. For the unimproved soil model, the maximum settlement and tilting under the Loma Prieta earthquake were 42.34&#xa0;cm and 0.0025, while for the Kobe earthquake, they were 42.36&#xa0;cm and 0.0036, exceeding the allowable limits defined by the Russian PiNAE-5.10-87 code for I-category structures (Su ≤ 30&#xa0;cm, slope &lt; 0.003). However, in the improved soil model, settlements and tilting were significantly reduced, with a maximum of 23.68&#xa0;cm and 0.0018 for the Kobe earthquake and 23.60&#xa0;cm and 0.0014 for the Loma Prieta earthquake, demonstrating compliance with regulatory standards. These findings confirm that soil improvement measures at the Rooppur NPP site effectively enhance foundation stability, mitigating seismic-induced deformations.</p>

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Seismic Stability Assessment of a Nuclear Reactor Mat Foundation Using Numerical Modeling

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Mosharof Al Alim,
  • Zamiul Ahmed,
  • Shoma Hore,
  • Mushfika Ansary,
  • Sakhia Nur,
  • Ripon Hore,
  • Mehedi A. Ansary

摘要

Ensuring the structural and radiational integrity of nuclear power reactor facilities is crucial for operational safety, necessitating a stable mat foundation under both static and seismic conditions. This study evaluates the settlement and tilting of a nuclear reactor mat foundation under seismic loading using numerical analysis in Plaxis 3D. Structural and seismic load parameters from the Rooppur Nuclear Power Plant (RNPP) Project were incorporated into four foundation models: two representing natural soil conditions and two with improved soil properties. Seismic excitations from the Kobe and Loma Prieta earthquakes were applied, considering a peak ground acceleration of 0.33 g. For the unimproved soil model, the maximum settlement and tilting under the Loma Prieta earthquake were 42.34 cm and 0.0025, while for the Kobe earthquake, they were 42.36 cm and 0.0036, exceeding the allowable limits defined by the Russian PiNAE-5.10-87 code for I-category structures (Su ≤ 30 cm, slope < 0.003). However, in the improved soil model, settlements and tilting were significantly reduced, with a maximum of 23.68 cm and 0.0018 for the Kobe earthquake and 23.60 cm and 0.0014 for the Loma Prieta earthquake, demonstrating compliance with regulatory standards. These findings confirm that soil improvement measures at the Rooppur NPP site effectively enhance foundation stability, mitigating seismic-induced deformations.