核电站冷却用电机抗震性能鉴定及裕度分析

Study on Seismic Qualification and seismic margin assessment of the Electromotor of Nuclear Power Plant

根据相关核安全法规,核电站的冷却水泵用电机为核安全2级,必须确保承受若干次安全停堆地震(OBE)和运行基准地震荷载(SSE)荷载之后,仍能保持结构完好性和安全运行功能。本文通过模拟地震振动台设备对1台1E级冷却水泵用电机进行白噪声和若干次人工波激振,获取了电机的基本动力特性,并通过在试验过程中对电机功能的监测和试验数据的分析,结论表明该电机在各地震工况下结构完好,各功能指标在抗震试验前后无明显变化,满足抗震要求。利用高置信度低概率失效(HCLPF)来量化设备的抗震裕度(SMA),采用核电站抗震裕度评估方法EPRINP-6041-SL中易于实施的保守的确定论失效裕度(CDFM)分析方法,合理选取其反应谱削波因子、抑制因子等主要参数,计算其抗震裕度比例因子,得到该电机的抗震裕度。

According tothe nuclear safety regulations,the cooling electromotor of nuclear power plant is nuclear safety 2E,which must be safety to withstand the several OBE and SSE earthquake excitation.In this paper,a class 1E cooling electromotor was studied by using the white noise scanning method and several artificial excitation waves though a shaking table tests.In the test,the dynamic characteristics of the motor are obtained,and the running condition of the motor is monitored.The results show that the class 1E motor was still in good condition after earthquake shock.The seismic margin of the equipment is quantified by the high confidence low probability failure(HCLPF).The conservative conclusion failure margin(CDFM)analysis method in EPRI NP-6041-SL report is easy to implement,and by it the the response spectrum clipping factor,inhibiting factor and other main parameters were selection and calculating the seismic margin factor,to get the seismic margin of the motor.