Abstract
The finite element analysis is used to study the seismic performance of the emergency diesel worm gear retarder in nuclear power plant. By modal analysis of the structure, it is concluded that the first natural frequency is higher than 33 Hz. Then the seismic analysis is performed both on the horizontal and vertical conditions. The analysis results show that under the equivalent earthquake acceleration 4.5g, the stress is low for the retarder case and other components of the worm retarder, and fulfills the material strength requirement. It can be considered that the structure of the retarder is stable and has excellent anti-seismic performance, meeting the seismic requirement for class 3 nuclear safety equipment.
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