中国核电厂抗震裕度地震谱形问题探讨

发布时间：2018-03-18 20:32

  本文选题：抗震裕度评价　切入点：抗震裕度地震　出处：《地震地质》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:After the Fukushima nuclear accident, the earthquake, as an initial event, caused serious accidents in nuclear power plants. In this context, the earthquake tolerance evaluation of nuclear power plants in China has been carried out one after another. However, different seismic spectrum forms are selected in the evaluation. Based on the seismic margin evaluation method for the early operating nuclear power plant in the United States and the seismic hazard background analysis of the nuclear power plant site in China, The differences of seismic design benchmarks for nuclear power plants between China and the United States are compared. In view of the current situation in China, It is suggested that priority should be given to the evaluation of the aseismic margin of the second generation plus reactor type power plant. By comparing and analyzing the RG1.60 spectrum and the specific SL-2 acceleration response spectrum of the normalized plant site, It is found that the response spectrum of some nuclear power plant sites exceeds the RG1.60 spectrum at high frequency. It is inappropriate for such sites to directly enlarge the standard response spectrum as an earthquake with seismic margin. The nuclear power plant site with specific SL-2 magnitude ground motion and standard design is selected for analysis, and the seismic margin earthquake is determined by different methods. The results show that the NUREG0098 median spectrum calibrated by 0.3g is obviously lower than the uniform probability spectrum and the set seismic spectrum of the same PGA level in the platform and the long-period section, and all three can be enveloped by the 0.3g RG1.60 spectrum. In order to evaluate the seismic safety margin of the actual seismic capacity of the nuclear power plant relative to the site, we can adopt the uniform probability spectrum or set the seismic spectrum, in order to evaluate the seismic safety margin of the actual seismic capacity of the second generation plus operation nuclear power plant relative to the design reference ground motion, The RG1.60 spectrum calibrated by given PGA is recommended.
【作者单位】： 中国地震局地球物理研究所;环境保护部核与辐射安全中心;
【基金】：国家重大科技专项子课题“核电厂工程场地地震影响及其适应性评价技术研究”(2013ZX06002001-09)资助
【分类号】：P315.9;TM623
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本文编号：1631203