Stress and Fatigue Analysis for Lower Joint of Control Rod Drive Mechanisms Seal House
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摘要: 采用有限元分析方法对某核电工程控制棒驱动机构耐压壳下部密封环的2种对接厚度进行了应力和疲劳分析对比,在疲劳分析中采用瞬态分组技术,同时参考RCC-M 2002规范对ANSYS程序中的弹塑性修正因子(Ke)进行解耦修正。结果表明,2种接头厚度的分析结果均满足RCC-M规范中的应力评定准则,其中,较薄密封环结构疲劳分析结果相对更安全,较厚密封环结构在其余工况相对更安全;在疲劳分析中对瞬态进行分组能明显降低使用系数和一次加二次应力之和幅值的保守性;在热和机械共同作用的一次加二次应力之和的幅值较高时,对Ke的修正能明显提高计算结果精度。Abstract: Two kinds of seal houses for control rod drive mechanisms which have different thickness of the lower seal ring was analyzed for its stress and fatigue by finite elemet method.In the fatigue compution,all the transitions were grouped into several groups,and then the elastoplastic strain correction factor was modified by analyzing thermal and mechanical load separately referring the rules of RCC-M 2002.The results show that the structure with thicker seal ring behaves more safely than the other one except in the second condition.Meanwhile,the amplify of the primary and secondary stress as well as fatigue usage factor can be reduced by regrouping the transients.The precision of fatigue usage factor can be elevated using modified Ke when the amplify of the primary and secondary stress is large to some extent produced by both thermal and mechanical loads.
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Key words:
- Control rod drive /
- Fatigue /
- Elastoplastic correction factor
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