Earthquake resistance support device for nuclear power plant, and nuclear power plant

A compact dynamic vibration absorber with a hollow weight and coil spring device on a horizontal beam addresses the challenge of suppressing horizontal vibrations in nuclear power plants, providing effective earthquake resistance within limited space.

JP2025179480APending Publication Date: 2025-12-10HITACHI GE NUCLEAR ENERGY LTD
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Patent Information

Application Number
JP2024086250
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-05-28
Publication Date
2025-12-10

AI Technical Summary

Technical Problem

Existing earthquake-resistant support structures for nuclear power plants, such as those described in Patent Documents 1, 2, and 3, are either too large to fit within the limited space of reactor containment vessels or are specialized for vertical vibrations, failing to effectively suppress horizontal vibrations during earthquakes.

Method used

A compact dynamic vibration absorber is integrated into the support structure, comprising a horizontal beam with a hollow weight and coil spring device that vibrates axially to suppress horizontal vibrations of the reactor pressure vessel, reducing installation space and enhancing vibration damping.

Benefits of technology

The dynamic vibration absorber effectively suppresses horizontal vibrations of the reactor pressure vessel during earthquakes while minimizing space requirements and ensuring stable vibration damping, allowing for efficient installation within the reactor containment vessel.

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Abstract

To suppress horizontal vibration of a nuclear pressure vessel during an earthquake, and make a dynamic vibration absorber compact to suppress an installation space of the dynamic vibration absorber, in a nuclear power plant.SOLUTION: An earthquake resistance support device for a nuclear power plant is arranged in a reactor containment vessel, and suppresses horizontal vibration of a reactor pressure vessel supported by a pedestal when an earthquake occurs. The earthquake resistance support device comprises a horizontal beam that is arranged between the reactor containment vessel and the reactor pressure vessel, and the pedestal, and extends in the radial direction of the reactor pressure vessel and the pedestal; and a dynamic vibration absorber installed on the horizontal beam. The dynamic vibration absorber comprises a hollow weight extrapolated to the horizontal beam and movable in an axial direction of the horizontal beam, and a coil spring device that elastically supports the hollow weight in the axial direction of the horizontal beam, to allow the hollow weight to vibrate in the axial direction of the horizontal beam.SELECTED DRAWING: Figure 3
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