CAJ | 학술논문

为防止管道失效，RC C－M规范规定除应考虑自重、压力等载荷变化导致的应力变化外，核一级辅助管道必须考虑热膨胀和热弯曲应力变化对疲劳累积使用系数的影响。重点研究基于PIPESTRESS的核一级辅助管道疲劳分析的基本方法，并以某电站核一级辅助管道为例，通过专用管道力学分析软件PIPESTRESS确定管道在温度载荷（热膨胀、温度梯度和锚固点热位移）、压力载荷和机械载荷等交变载荷作用下各瞬态工况应力变化幅值，采用雨流计数法计算疲劳累积使用系数进行疲劳分析和评定。
위방지관도실효，RC C－M규범규정제응고필자중、압력등재하변화도치적응력변화외，핵일급보조관도필수고필열팽창화열만곡응력변화대피로루적사용계수적영향。중점연구기우PIPESTRESS적핵일급보조관도피로분석적기본방법，병이모전참핵일급보조관도위례，통과전용관도역학분석연건PIPESTRESS학정관도재온도재하（열팽창、온도제도화묘고점열위이）、압력재하화궤계재하등교변재하작용하각순태공황응력변화폭치，채용우류계수법계산피로루적사용계수진행피로분석화평정。
In order to avoid auxiliary class 1 piping failure,thermal expansion and thermal bending stress range should be taken into consideration for evaluation of cumulative usage factor besides deadweight and pressure loadings due to RCC -M code.The fatigue behavior analysis methodology for auxiliary class 1 piping is realized by the PIPESTRESS software,and the alternating stress intensity of auxiliary class 1 pip-ing is calculated under thermal(thermal expansion,thermal gradients and thermal anchor displacements included),pressure and mechanical cycling loading conditions.And the cumulative usage factor is calcu-lated according to rainflow counting method.