波动管设计改进对反应堆厂房地震响应的影响分析

Evaluation on Influence of Modification of Surge Line Piping Arrangement on Seismic Responses

为了减轻由于稳压器波动管热分层引起的热疲劳效应及降低安装难度,提出了在M310型压水堆稳压器中加大波动管与主回路夹角的布置改进方案。波动管的布置改进将引起反应堆厂房内部结构布置的改变,对地震响应产生影响。根据设计改进重建结构计算模型,进行抗震分析,并与旧模型的相应结果进行对比,探讨设计改进对反应堆厂房地震响应的影响,为改进方案的论证提供参考。

To alleviate the thermal stress and fatigue induced by thermal layer separation and improve the erection conditions, the modification, enlarging the angle between surge line piping and primary piping and installing the pressurizer at a higher level, has been taken into account in the new design based on M310 model. This modification can bring the changes of the internal structure arrangement of reactor building and lead to a set of different seismic responses to some extend. A new structure model to account for the modification is constructed. The seismic system analysis is conducted based respectively on the new and old model, and the results are compared with each other so as to evaluate the differences of seismic responses in two cases. Some conclusions can be provided as reference to evaluate the feasibility of this modification.