KORI Unit 3 Nuclear Power Plant, Periodic Safety Review Seismic Qualification

Seoul, South Korea

Market: Nuclear



Kori Unit 3 is a 900 MW pressurized water reactor that has been in service since 1985.  All operating nuclear power plants in Korea are required to perform a Periodic Safety Review (PSR) every ten years against eleven safety elements per the Korean nuclear safety authority, and review of seismic qualification of safety-related equipment is one of these elements.  Korea Hydro and Nuclear Power (KHNP) retained SGH to perform an experience-based seismic adequacy verification for equipment important to safety as part of the PSR for Kori Unit 3.

Scope | Solutions

The equipment is reviewed against current safety standards and practice to ensure safety throughout the plant’s operating lifetime.  The licensing basis safe shutdown earthquake of Kori Unit 3 is the U.S. Regulatory Guide 1.60 spectral shape anchored to 0.2g peak ground acceleration.

A seismic PSR typically includes the following tasks:

  • Development of seismic equipment list (SEL)
  • Review of on-site seismic qualification documents
  • Seismic walkdown review and screening of seismically rugged SEL items
  • Seismic capacity evaluations of screened-in items
  • Independent peer review

SGH’s engineers, who were certified by Seismic Qualification Utility Group (SQUG) in the use of earthquake experience-based methods, conducted the PSR seismic review.  The earthquake experience-based approach has been used to address the USI A-46 issue of the older operating plants in the United States. 

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