SEISMIC ISOLATION/ASEISMIC/TSUNAMI-PROOF MECHANISM OF NUCLEAR POWER PLANT

摘要

PROBLEM TO BE SOLVED: To establish aseismatic/Tsunami-proof safety with sufficiently safety factors against giant earthquakes of seismic intensity of 7 or more and giant Tsunami of wave height of 15 to 20 m and more in a nuclear power plant.SOLUTION: Seismic isolation mechanisms are installed to a reactor supporting structure and a turbine supporting structure arranged on the inside and outside of a reactor container, both the supporting structures are rigidly coupled with each other by coupling pipes pierced into a plurality of portions of a reactor container wall and an airtight state of the reactor container is formed by seismic isolation pipes to construct an integrally fluctuated seismic isolation base. Apparatuses and pipelines of a main steam system and a condensed water supply system between a reactor and a turbine are arranged on the seismic isolation base to reduce seismic force. A building in a yard is water-tight, wave-proof watertight gates are arranged in respective large openings, watertight gates are arranged in respective small gates and always closed, sucking/exhausting snorkels are arranged for emergency generators or the like to prevent Tsunami flood, the inside of the building is formed as water-tight sections, and electrical systems in the plant are double-protected to guarantee aseismatic/Tsunami-proof safety.