Concepts for the Justification of Design Solutions for Nuclear Power Plants Taking into Account Special Dynamic Effects

Abstract

The basic principles of nuclear plants design analysis and justification for dynamic natural and technogenic impacts were given.

In the overall scope of the tasks of design substantiation of nuclear power plant structures, a special place was given to the development of methods for structures analysis under special dynamic impacts. In particular, increased requirements were imposed on the seismic stability and reliability of nuclear power facilities and the equipment installed on them both under normal operation and under special dynamic impacts.

Justification of necessity of taking into account the effects of interaction between the structure and the soil base presented. The study of the problem of the soil-structure interaction , taking into account the geological structure of the construction site and the structural features of the structure, makes it possible to move on to more reasonable calculation models.

The main current directions of structures analysis for special dynamic impacts are given. The specifics of assessing the strength and reliability of the foundation, structures, equipment of nuclear power plants under these impacts are considered.

The work outlines and systematizes the basic principles for determining seismic excitations on a free ground surface of the site for the nuclear plants, modern modeling methods and analysis of the nuclear plants structure, the requirements for determining technogenic impacts, and methods for calculating safety structures. Practical implementation of new high-strength materials, e.g. steel fiber-reinforced concrete that is necessary for a high-quality strategic improvement stage for layouts for nuclear power plants was demonstrated. An assessment of the effectiveness of using steel fiber concrete instead of ordinary concrete is given.