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核反应堆冷却剂液位是重要的安全参数,而压力容器破口事故(LOCA)下更加需要测量坍塌液位来反映堆芯冷却状态。该文针对差压式液位测量方法在破口事故下的特性进行了理论分析和试验研究。分析表明:喷放附加压降和喷放引起的压力波振荡都可能造成对于差压式测量方法产生附加的扰动;其中以压力波影响为主。实验结果说明:压力波振荡等影响造成差压液位测量结果产生峰值不大于2.5%的附加误差,这在破口事故下属于测量精度允许范围。因此,差压方法在压力容器小破口事故下仍能正确反映容器内坍塌液位,即容器的液体装量。
Nuclear reactor coolant levels are important safety parameters, and it is even more necessary to measure the collapse level under a pressure vessel breach (LOCA) to reflect the core cooling status. In this paper, the theoretical analysis and experimental research on the characteristics of differential pressure liquid level measuring method under the breach accident are carried out. The analysis shows that the additional pressure drop and the pressure wave oscillation caused by the discharge may cause additional perturbations to the differential pressure measurement method, of which the pressure wave is the main factor. The experimental results show that the additional error caused by the pressure wave oscillation and other factors will cause the peak value of differential pressure level measurement to be no more than 2.5%, which belongs to the allowable range of measurement accuracy under the breaking accident. Therefore, the differential pressure method can still correctly reflect the collapse level of the container under the small-pressure accident of a pressure vessel, that is, the liquid content of the container.