瞬态条件下稳压器水位测量特性试验研究

稳压器是压水堆核动力装置压力安全系统的主要设备,其水位波动反映了一回路系统的水容积变化情况,是稳压器运行控制的关键参数之一。本文基于双区非平衡模型模拟蒸汽泄露条件下的稳压器水位变化,并针对稳压器蒸汽泄漏工况开展了水位测量特性试验研究,研究了2.6~7.8 kPa/s压降速率工况下,稳压器内水位测量压差的变化情况。研究发现:采用压差修正液相区密度计算的水位值在压力瞬变情况下有较好的跟随性,能够更好的反应水位特性;表征稳压器内液相区密度变化的压差在压力减小的过程中,过渡时间小于40 s,且过渡时间与压变速率单因素无强相关性。这为稳压器的安全运行控制提供了基础研究数据。

Experimental Research on Water Level Measurement Characteristics of Pressurizer in Transient Condition

Pressurizer is the main equipment of the pressure safety system of PWR nuclear power plants. Its water level reflects the water volume of the primary loop, which is one of the key parameters for the operation and control of the pressurizer. Based on the two-zone unbalanced model, this paper simulates the water level change under the condition of steam leakage and tests the characteristics of water level measurement for the steam leakage condition of the pressurizer, and the pressure drop of the water level under the pressure drop rate of 2.6~7.8 kPa/s in the pressurizer was investigated. It is found that the water level calculated by the pressure difference correction liquid zone density has a good follow-ability in the case of pressure transient, which can better reflect the water level characteristics. Pressure drop characterizing the change of the density in the liquid region of the pressurizer during the pressure reduction, the transition time is less than 40s and there is no strong correlation between the transition time and the single factor of the pressure drop rate. This provides basic research data for the safe operation of the pressurizer.