压水堆控制棒价值误差分析

Error Analysis for PWR Control Rod Integrate Worth

压水堆启动物理试验时,控制棒价值是比较容易超限的一个参数。本文系统分析了影响控制棒价值计算值与测量值偏差的主要因素以及各因素的影响特点、大小,并给出了部分实例分析,以期降低控制棒价值的误差,减少因控制棒价值超差对启动物理试验带来的不利影响,并在控制棒价值超差原因分析时提供帮助。分析表明,为降低控制棒价值误差,需要建立精确、合理的反射层模型,尽可能采用燃料组件的制造参数,控制棒的计算方法要考虑试验方法与工况;将注量率图试验结果、硼浓度和其他堆芯参数与控制棒价值误差分布特点相结合,进行原因查找。

During physical startup test, the control rod integrate worth is a parameter which is most likely to be overstepped. This paper analyzes the factors which contribute to the control rod worth error and its feature. Typical example is also included. To reduce the control rod error, it is strongly suggested to create an accurate reflector model, select fuel assembly manufacture data as input and consider the control rod worth measurement method and condition when performing the calculation. To identify the main reason of control rod worth error, flux mapping test results, boron concentration and other core parameters should be analyzed comprehensively, combining with the control rod worth error distribution characteristics.