稳压器垂直支承锚固件安装超差的分析评估
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摘要
压水堆核电厂稳压器垂直支承锚固件为一次预埋件,在安装过程中容易产生超差。由于其结构较复杂,评估超差对后续稳压器安装就位的影响较为困难。本文对稳压器垂直支承结构的可调节裕量进行分析,幵基于稳压器垂直支承锚固件各套管的实际超差情况,结合稳压器现场安装要求,通过模拟数值计算确定了稳压器的最佳就位位置。根据稳压器支承结构特点,提出了减小现场安装难度的优化建议如下:增加稳压器垂直支承结构中下环板套管孔径,有效增加稳压器垂直支承结构中下环板套管的可调裕量;采用球面垫圈代替稳压器支承结构中采用的平垫圈,从而放宽稳压器支承结构对地脚螺栓安装的垂直度要求。
Pressurizer vertical support anchor frames in nuclear power plants with pressurized water reactors are primary embedded part. Deviation occurs often during the installing process. It is difficult to evaluate the displacement deviation impact on the follow-up installation of pressurizer, for its complicated structure. This paper analyzed the adjustable margin of the vertical supports of the pressurizer. The optimal installation position of the pressurizer is determined by simulation numerical calculation, based on the actual deviation conditions of pressurizer vertical support anchor frames, and considering the installation requirements of the pressurizer. In order to reduce the difficulty of pressurizer installation on site, this paper put forward the optimization recommendation about the support structure based on the structure characteristics of the pressurizer as follows: increasing the diameter dimension of the lower plate sleeve holes to increase the adjustable margin of lower plate, using the flat washer instead of the spherical washer to relax the perpendicularity requirements of the anchor bolts installation.
Pressurizer vertical support anchor frames in nuclear power plants with pressurized water reactors are primary embedded part. Deviation occurs often during the installing process. It is difficult to evaluate the displacement deviation impact on the follow-up installation of pressurizer, for its complicated structure. This paper analyzed the adjustable margin of the vertical supports of the pressurizer. The optimal installation position of the pressurizer is determined by simulation numerical calculation, based on the actual deviation conditions of pressurizer vertical support anchor frames, and considering the installation requirements of the pressurizer. In order to reduce the difficulty of pressurizer installation on site, this paper put forward the optimization recommendation about the support structure based on the structure characteristics of the pressurizer as follows: increasing the diameter dimension of the lower plate sleeve holes to increase the adjustable margin of lower plate, using the flat washer instead of the spherical washer to relax the perpendicularity requirements of the anchor bolts installation.
引文