某核电站安全壳1:15模型振动台试验

SHAKING TABLE TESTS OF A 1:15 REINFORCED CONCRETE CONTAINMENT VESSEL MODEL FOR A NUCLEAR POWER PLANT

安全壳是核电站最后一道安全屏障,其抗震性能受到高度重视。该文根据某核电站安全壳原型结构,依据相似理论并采取一些简化措施,设计了一个相似比为1∶15欠配重的安全壳模型。试验选取El Centro波、Taft波和人工波作为地震动输入。为验证原型安全壳在峰值加速度为0.25g极限安全地震SL-2水平下的抗震安全,进行了峰值加速度分别为0.1g、0.2g和0.3g(相当于原型结构0.088g、0.175g和0.263g)三组工况试验,并且在每组工况前对安全壳模型进行白噪声扫频测试。通过安全壳模型上布置的加速度传感器、位移计和应变片,得到了安全壳模型在三个工况下的动力响应。最后对试验数据进行了分析处理,试验结果表明原型安全壳结构在SL-2水平地震动下仍可保持为线弹性状态,具有充足抗震安全裕量。

The seismic capacity of the containment of a nuclear power plant is of high importance as it offers the final safety protection to the plant. In this study, a 1∶15 containment model with less ballast of a prototype containment of a nuclear power plant was designed for shaking table tests based on the similarity theory and simplification measures. In the tests, El Centro wave, Taft wave and artificial wave were employed as seismic inputs. To justify the safety of the prototype containment under the ultimate safety earthquake at the SL-2 level(peak acceleration 0.25g), three load cases of 0.1g, 0.2g and 0.3g peak accelerations(corresponding to 0.088g, 0.175g and 0.263g for the prototype containment) were applied, and the white noise scanning test was conducted before each load case. The dynamic responses of the containment under three load cases were measured using accelerometers, displacement meters and strain gauges. The test data was analyzed and results showed that the prototype containment is within the elastic range and has sufficient seismic safety margin under the seismic motion at the SL-2 level.