DISCUSSION ON THE SPECTRA SHAPE OF SEISMIC MARGIN EARTHQUAKE OF NUCLEAR POWER PLANT IN CHINA

doi:10.3969/j.issn.0253-4967.2017.05.010

Abstract

Abstract: Fukushima nuclear accident caused widespread concern of earthquake initiated severe accident. Under this background, China nuclear utilities carried out research and application of seismic margin assessment(SMA)approach to evaluate the seismic margin of the existing nuclear power plants(NPP)by different spectra shape of seismic margin earthquake(SME). By reviewing the method used to determine SME of operational NPP in central and eastern United States(CEUS), this paper analyzed the seismic hazard characteristic of China NPP sites, contrasted the design basis ground motion between NPP in CEUS and China, and suggested giving priority to evaluating the seismic margin of operational NPP that adopted the improved second generation technology for the urgency and importance of assessment on the actual seismic capacity of NPP. Comparing RG1.60 spectrum to normalized site-specific SL-2 level acceleration spectra, we found that some normalized spectra overtook the RG1.60's in high frequency range, so it is not always adequate to scale RG1.60 spectrum to evaluate the seismic margin for sites of the improved second generation NPP. We selected a sample site whose site-specific SL-2 level ground motion is close to the standard design of improved second generation NPP(0.2g scaled RG1.60 spectrum)to determine the seismic margin earthquake by probabilistic seismic hazard analysis method of the sample site. Compared to the given PGA(0.3g)scaled scenario earthquake ground motions and the uniform hazard response spectrum(UHRS), whose PGA is 0.3g to PGA(0.3g)scaled standard spectra(median NUREG/CR0098 spectrum and RG1.60 spectrum), the results demonstrated that uniform hazard response spectrum and scaled scenario earthquake ground motions are both significantly higher than the PGA scaled median NUREG/CR0098 spectrum, and all the three spectra are enveloped by PGA scaled RG1.60 spectrum. Then, this paper suggests adopting the uniform hazard response spectrum or scenario earthquake ground motions to evaluate the seismic margin of improved second generation NPP beyond site SL-2 ground motion; and to evaluate the seismic margin of improved second generation NPP beyond standard design, we recommend to use PGA scaled RG1.60 spectrum.

Key words: SMA, SME, spectra shape, scenario earthquake, uniform hazard spectrum

摘要： 福岛核事故后，地震作为初始事件引发核电厂严重事故的问题引起了广泛关注。在此背景下，中国核电厂相继开展了抗震裕度评价，但在评价中选用了不同的地震谱形。基于美国针对早期运行核电厂开展的抗震裕度评价方法和中国核电厂址的地震危险性背景分析，对比了中美两国核电厂抗震设计基准的差异，针对中国目前的情况，建议优先对采用二代加堆型的运行电厂进行抗震裕度评价。通过将RG1.60谱与归一化厂址特定SL-2级加速度反应谱进行对比分析，发现部分核电厂址反应谱谱形在高频部分超过了RG1.60谱，对于这类厂址，直接放大标准反应谱作为抗震裕度地震是不恰当的。对于采用二代加堆型的核电厂，选择了某个厂址特定SL-2级地震动与标准设计比较接近的核电厂址进行了分析，采用不同方法确定其抗震裕度地震，结果表明0.3g标定的NUREG0098中值谱在平台段和长周期部分明显低于相同PGA水平的一致概率谱和设定地震谱，三者都能被0.3g标定的RG1.60谱所包络。考虑到中国运行电厂的抗震设计特点，为了评价核电厂实际抗震能力相对于厂址的抗震安全裕度，可以采用一致概率谱或设定地震谱；为了评价二代加运行核电厂实际抗震能力相对设计基准地震动的抗震安全裕度，建议采用给定PGA标定的RG1.60谱。

关键词: 抗震裕度评价, 抗震裕度地震, 反应谱谱形, 设定地震, 一致概率谱

CLC Number:

P315.9

JING Xu, CHANG Xiang-dong, XIAO Jun. DISCUSSION ON THE SPECTRA SHAPE OF SEISMIC MARGIN EARTHQUAKE OF NUCLEAR POWER PLANT IN CHINA[J]. SEISMOLOGY AND GEOLOGY, 2017, 39(5): 1007-1016.

荆旭, 常向东, 肖军. 中国核电厂抗震裕度地震谱形问题探讨[J]. 地震地质, 2017, 39(5): 1007-1016.

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