Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

Ricardo Bustamante, Gilberto Mosqueda and Minkyu Kim
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Ricardo Bustamante: Department of Structural Engineering, University of California San Diego, La Jolla, CA 92093, USA
Gilberto Mosqueda: Department of Structural Engineering, University of California San Diego, La Jolla, CA 92093, USA
Minkyu Kim: Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yusung-gu, Daejon 305-353, Korea

Energies, 2022, vol. 15, issue 5, 1-18

Abstract: Nuclear power plants are required to maintain operation after an earthquake, leading to a safe shutdown if necessary. In the case of a loss of offsite power, the onsite emergency diesel generator is critical to ensure procedural operations of the nuclear power plant. As a means to reduce the overall seismic risk, a three-dimensional seismic protection system is proposed to enhance the seismic performance of the emergency diesel generator. The proposed seismic isolation system decouples the horizontal and vertical components of shaking and considers available hardware to achieve an effective isolation solution over the range of excitation frequencies considered. Numerical analysis of the proposed system demonstrates a reduction in seismic demands on the emergency diesel generator and provides a higher safety margin than conventional base installation procedures. Umbilical lines that cross the isolation plane are considered and impose additional constraints on the displacement capacity of the isolation system. However, increasing the displacement capacity of these components can significantly increase the safety margin against failure. The seismic protection system can be customized depending on the seismic hazard and application to different seismic regions.

Keywords: base isolation; 3D seismic protection; nuclear power plant; emergency diesel generator; limit states; SPRA; HCLPF; fragility curves (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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