Study On Stability Of AP Series Nuclear Power Plant Steel Containment Under Seismic Loading

This paper is to identify the safety coefficient, the maximum safety ratio of height todiameter, and minimum safety embedded depth regularities under the safe shutdownearthquake (SSE) load adopted by the AP1000nuclear technology, and investigate thesafety stability effect regularities under different seismic forces, ratio of height to diameterand embedded depth, hoping to provide some reference for the Follow-up AP1000Projectsof China.This research method of this paper is to propose that the connection between the AP1000steel containment vessel and the concrete base-mat, is not rigid connection as proposed bythe designer, but the friction contact surfaces, between which gaps might exist in earthquakes.In the basis of above, analyses have been done on the gaps under different seismic forces,ratio of height to diameter and embedded depth via the finite element software ABAQUS, orthe containment stability effect regularities of the upper containment deformation anglecaused by gap extension, and the judgment of the containment vessel instability has been putforward.The research contents and main results of this paper are: reasonable simplification andABAQUS finite element analysis on the steel containment vessel model; investigation on thedesign safety coefficient of the AP1000steel containment vessel stability in safe shutdownearthquake (SSE) under different seismic forcesï¼›investigation on the steel containmentvessel stability regularities in different ratio of height to diameter under seismic force, andproposal of the maximum safe height to diameter ratio; investigation on the containmentvessel stability regularities in different embedded depth under seismic forces, and proposal ofthe minimum safe depth of embedmentï¼›...