放射性廢棄物最終處置場址CAV耐震設計準則

Nuclear power is considered one of the “green” methods in electricity generationin comparison to thermal power. However, for nuclear power generation, thedisposal of radioactive waste is a critical issue. Given the huge risk associatedwith the failure of the disposal facility, the earthquake-resistant design of thefacility is very important, not to mention that Taiwan is subject to high seismicityowing to the unique geological background.Ground motion intensity measure, such as peak ground acceleration (PGA), is aparameter to describe the severity and magnitude of an earthquake groundmotion. Compared to PGA that has been commonly used in earthquakeengineering, cumulative absolute velocity (CAV) is a relatively new intensitymeasure, which has not been utilized in earthquake-resistant design. However,recent studies have pointed out CAV is more indicative of structural damage thanPGA. Specifically, the EPRI (electric power research institute) study consideredthe CAV threshold should be around 0.3 m/s for the onset of structure damage,and a nuclear power plant needs to be shut down for safety inspection when themeasured CAV at the site exceeds 0.3 m/s during an earthquake. To sum up,since CAV was proposed, it has gained much attention for developing a moresuitable earthquake-resistant design for the facilities of nuclear power plants.In this research, we aim to 1) conduct a comprehensive review on CAV studiesfor earthquake engineering, 2) develop a ground motion database, and 3)investigate the relationship between CAV and other ground motion intensitymeasures (e.g., PGA). For the first task, we will review every single paperrelated to CAV and its application to earthquake-resistant design. For the secondtask, we will utilize the open-source ground motion data available on the websiteof the Central Weather Bureau of Taiwan, which periodically publishes the newlyrecorded ground motion data around Taiwan from the seismic instrumentationnetwork in Taiwan. We estimate that we can collect more than 10,000 strongground motion data for this research. As to the third task, with the ground motiondatabase that we will have established, we will calculate a variety of groundmotion intensity measures (e.g., CAV, PGA) for each of the ground motion fromthe database. Next, we can conduct statistical analyses on the intensitymeasures, examining the possible relationships between CAV and other intensitymeasures (e.g., PGA) that are more commonly used nowadays.Finally, we will use the ground motion database as the input motions for ournumerical simulations (using finite element analysis) on the dynamic response ofan underground radioactive-waste storage facility. With such finite elementanalyses, we can investigate the displacements of the underground facilitysubject to a variety of ground motions with CAV from very large to vary small. Asa result, this study can establish the relationship between CAV and thedisplacement of underground facility, then developing suitable CAV-basedearthquake-resistant designs for underground facilities for radioactive wastedisposal.