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确定核电站安全停堆地震荷载一般常用定数法,并以在厂址约320公里范围内最大的历史地震对厂址的最大影响为依据。由于它过分地强调了最大历史地震而未考虑其重复率及发生更大地震的可能性。因而近来又提出了采用概率法,即以预期地震重复周期的方法来确定安全停堆地震荷载。本文简要阐述和对比了这两种方法,并提出了两个工程实例。
The commonly used fixed number method for determining the safety shutdown earthquake load of nuclear power plants is generally based on the maximum impact on the site of the site by the largest historical earthquake of about 320 km in the site. Because it overemphasizes the largest historical earthquake without considering its repetition rate and the possibility of a larger earthquake. Therefore, a probabilistic approach has recently been proposed to determine the safety shutdown seismic load based on the expected earthquake repetition period. This article briefly expatiates and compares these two approaches and presents two engineering examples.