ANÁLISIS DE RESPUESTA SÍSMICA DE LA CONTENCIÓN PRIMARIA DE UN REACTOR NUCLEAR TIPO BWR

Abstract

In this work a methodology has been developed to evaluate the dynamic structural behavior on the primary contention of a nuclear power reactor (BWR) subjected to seismic loads, using the method of the finite element. The analysis, it is focused specifically to the mark II reinforced concrete structure. The building of the primary containment is constituted of walls of concrete of 1.5 meters of thickness. Besides, it is reinforced with steel liner which is 9.525 mm thick. The main function of the wall is to prevent radiation leak from the inner reactor. A fundamental aspect is to make a study of the mechanical integrity of the containment of the reactor to satisfy the requirements with security levels. Therefore, the problem consists on evaluating the conditions more critics to certain values of acceleration of the base of the containment, thus simulating the action of an earthquake. In the study it will be considered, geometry, forces, and other conditions to which the containment of the reactor will be subject. The structure it was excited to different accelerations in its base and also natural frequencies it will be calculated. The obtained results it will describe the zones more critics in the containment building, in the first case obtain the maximum displacements of the structure of the natural frequencies; in the second case, an analysis of spectrum response using modal‐spectral method, for obtain the maximum normal stresses with external loads.