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中核核电运行管理有限公司秦山第二核电厂8台鼓型滤网均不同程度地出现螺栓孔拉长(呈椭圆)变大问题,导致鼓型滤网结构强度急剧下降,存在失效的风险。分析认为:电偶腐蚀和螺栓松动是导致鼓型滤网螺栓孔拉长变大的根本原因。根据此分析结论,通过对鼓型滤网轮毂整体进行全面防腐,组合紧固件的检修方式,彻底消除了鼓型滤网轮毂螺栓孔拉长变大的隐患,有效地提高了鼓型滤网的运行可靠性。
Nuclear Power Operation Management Co., Ltd. Qinshan second nuclear power plant eight drum-type filter are varying degrees of bolt hole elongated (elliptical) larger problems, resulting in a sharp drop in the strength of the drum filter structure, there is the risk of failure. The analysis shows that galvanic corrosion and bolt looseness are the basic reasons for the larger and longer drum bolt holes. According to the conclusion of this analysis, through the overall anti-corrosion drum hub overall, the combination of fasteners overhaul, and completely eliminate the Drum-type filter wheel hub hole becomes longer and longer hidden dangers, effectively improving the drum filter Operational reliability.