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Aircraft Impact Effects on an Aged NPP.

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Aircraft impacts on aged nuclear power plants (NPPs) are critical safety concerns. Ageing materials significantly increase structural damage and perforation risk during such events, compromising plant safety and reliability.

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Area of Science:

  • Nuclear Engineering
  • Structural Mechanics
  • Materials Science

Background:

  • Aircraft impacts are critical beyond-design events for nuclear power plants (NPPs).
  • Material ageing (degradation) exacerbates structural damage, potentially leading to catastrophic collapse.
  • Evaluating aged component performance is crucial for NPP safety and reliability.

Purpose of the Study:

  • To numerically simulate an aged NPP subjected to military aircraft impact.
  • To investigate the influence of impact velocity, direction, and location on structural response.
  • To assess the combined effects of material ageing and aircraft impact on NPP safety.

Main Methods:

  • Non-linear finite element (FE) analysis using MARC code.
  • Simulation of reinforced concrete containment building performance under impact.
  • Validation of the numerical model against experimental data (Sugano et al., 1993).

Main Results:

  • Ageing demonstrably increases NPP susceptibility to damage from aircraft impacts.
  • Impact area damage is dependent on aircraft type and target wall thickness.
  • Material degradation directly correlates with reduced residual resistance and increased perforation risk.

Conclusions:

  • Ageing significantly compromises the structural integrity of NPPs against aircraft impacts.
  • The study highlights the increased vulnerability of aged nuclear facilities.
  • Findings underscore the need for considering material ageing in NPP safety assessments for impact events.