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为了研究200MW低温核供热堆重力注硼系统在不同初始条件下的压力响应特性 ,建造了重力注硼模拟系统 ,并根据实际注硼系统的热工水力特性 ,给出了模拟相似准则。实验中 ,主要研究了冷态及热态条件下系统初始压力、汽液相管道阻力特性、汽液联通方式、堆芯罐与注硼罐上空腔体积比对两罐汽空间压力平衡时间和注硼响应时间的影响。实验结果表明 ,在完全模拟实际系统上空腔体积比的情况下 ,热态压力平衡时间较冷态时稍长 ,约为3s ,注硼响应时间约为6s,上述各参数对响应特性影响都不大 ,故可证实该系统是可以实现安全停堆的。增加注硼罐上空腔体积后各参数对压力平衡时间的影响较增加前有所不同 ,这将在后续实验中进一步深入研究
In order to study the pressure response characteristics of the boron injection system under different initial conditions for a 200MW low temperature nuclear reactor heating system, a gravity injection boron simulation system was constructed. According to the thermal and hydraulic properties of the boron injection system, simulation similarity criteria were given. In the experiment, the initial pressure of the system, resistance characteristics of the vapor-liquid phase pipeline, gas-liquid communication method, cavity volume ratio between the core tank and the boron injection tank were studied under the condition of cold and hot conditions. Effect of boron response time. Experimental results show that when the cavity volume ratio is completely simulated, the thermal equilibrium time is slightly longer than that of the cold state, about 3 s, and the response time of boron injection is about 6 s. The above parameters have no effect on the response characteristics Large, it can be confirmed that the system can be safely shut down. The effect of each parameter on the pressure balance time after increasing the cavity volume on the boron injection tank is different from that before the increase, which will be further studied in subsequent experiments