Advanced concrete structures and design methods
Full-scale test of an unreinforced concrete dome plug for the spent nuclear fuel repository
In the planned Swedish repository for spent nuclear fuel, plugs are designed to close the deposition tunnels. The outer part of these plugs consists of a concrete dome made with selfcompacting concrete, designed to have low pH to reduce negative effects on the bentonite clay buffer. A full-scale test has been performed to evaluate the performance of the plug, to test the installation and to verify underlying design assumptions. The behaviour of the concrete dome have been evaluated based on measurements, from casting the concrete until it was subjected to 4 MPa hydrostatic water pressure.
Contact: Richard Malm
Analysis of shallowly buried reinforced concrete pipelines subjected to earthquake loads
Buried reinforced concrete pipelines are widely used in e.g. water and wastewater systems. Failure of these infrastructures may result in drastic effects and recently they have been brought into focus as vital components in safety systems for nuclear power installations. The high level of safety has here lead to a demand for reliable earthquake risk analyses. Within the project, methods are compared and the use of seismic design loads demonstrated. FE analysis in 2D of soil-pipe interaction under seismic wave propagation is performed. The performance of concrete pipes subjected to seismic waves with different frequency content is evaluated with respect to different soil condition but also water mass effect.
Piping system subjected to seismic hard rock high frequencies
This project addresses the influence of support gaps in the analyses of a piping system when subjected to a seismic hard rock high-frequency load. The system is located within the reactor containment building of a nuclear power plant and is assessed to be susceptible to high-frequency loads. The stress response of the pipe and the acceleration response of the valves are evaluated for different support gap sizes. It is shown that the inclusion of the support gaps in the analyses reduces the stress response for almost all pipe elements. On the other hand, the acceleration response of the valves is not necessarily reduced by the consideration of the gaps.