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环路流量偏差对核电1000MW机组压水反应堆焓增特性影响的模拟研究

DOI: 10.13334/j.0258-8013.pcsee.2015.16.017, PP. 4139-4146

Keywords: 1000MW,压水反应堆,环路流量,数值模拟,偏差试验,焓增特性

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Abstract:

使用标准的k-ε双方程、有限体积离散法,对一台1000MW核电机组反应堆流场、温度场及堆芯焓增特性进行了建模研究;结合堆芯测量仪器及CLP和IN-CORE软件进行了反应堆实际物理试验;将模拟试验和实际物理试验进行了耦合研究。研究了反应堆正常运行及失流等工况下流量偏差对反应堆堆芯焓增特性的影响,并对实际运行流量偏差工况进行了分析。模拟和物理试验结果表明:堆芯流量分配板和下栅格板能够很好地调整进入堆芯的冷却剂流量偏差,堆芯内部温度场具有较强的流量偏差自调节功能。环路流量减少时,反应堆流场、温度场及堆芯焓增特性变化比较明显;环路流量稍有增加时变化不明显,环路流量增加值不大于5%时,反应堆内部流场及温度场偏差无明显变化。试验数据为反应堆的安全运行提供了理论数据。

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