Seismic Qualification of Class II Buildings of Nuclear Power Plants on the Basisof Non-Nuclear Seismic Codes

摘要

The German nuclear code for the seismic design of class II buildings which may jeopardize class I buildings in case of failure allows the use of the national German seismic code for non-nuclear buildings. The nuclear code, however, refers to a version of the non-nuclear seismic code which is not valid any more. A revision of the nuclear seismic code is under way. Until the completion of this revision the user need some guidelines for the appropriate application of the presently valid national seismic code. This paper makes some proposals for the proper use of this code. The proposed methods are demonstrated at the revaluation of the main turbine building of a pressurized water reactor. The seismic strength of the building is checked and the seismic excitation at the location of equipment is calculated. The results are verified by use of a detailed analysis according the standard methods as required for class I buildings in nuclear industry.