燃料组件稳态回路辐照考验多热工参数耦合特性研究  

Study on Coupling Characteristics of Multiple Thermal Parameters during the Fuel Assembly Steady-State Irradiation in the Test Loop

作　　者：斯俊平 孙胜[1] 童明炎[1] 卢孟康 雷晋 金帅 王万金[1] Si Junping;Sun Sheng;Tong Mingyan;Lu Mengkang;Lei Jin;Jin Shuai;Wang Wanjin(The 1st Sub-Institute of Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院第一研究所,成都610213

出　　处：《核动力工程》2022年第2期83-88,共6页Nuclear Power Engineering

摘　　要：燃料组件稳态回路辐照考验是研究组件抗辐照性能的关键环节,鉴于回路辐照考验热工参数对试验运行的重要性,本文针对稳态辐照考验回路,结合燃料组件对回路辐照考验热工参数的需求,分析了一次水流量及入口温度发生变化、装置内部存在换热以及不同换热器运行方式下回路系统的关键热工参数耦合特性。研究表明,随着换热器一次水入口温度和流量的下降,主换热器的最大换热功率有明显下降,在严重偏离设计工况下,主换热器换热能力存在不能满足燃料组件辐照运行的风险。同时,辐照装置内部换热对主换热器换热极为不利。在回路运行温度需求较高,而装置内部换热较强情况下,主换热器二次水流量的设计裕量不能低于装置内的热交换比例,且该裕量取值需趋大。两台主换热器并联运行的优势主要体现在较大一次水流量情况,且存在一个较小的一次水流量,使得单台换热器独立运行与两台换热器并联运行时的换热能力一致,低于该流量比例时,两台换热器并联运行时的换热能力反而弱于单台换热器运行。The steady-state irradiation in the test loop is a key process to study the antiirradiation performance of the fuel assembly.In view of the importance of the thermal parameters of the irradiation test loop to the test run,aiming at the steady-state irradiation in the test loop,combined with the requirements of fuel assemblies for the thermal parameters of the steady-state irradiation test,this paper analyzes the coupling characteristics of the key thermal parameters of the loop system under the changes of primary water flow and inlet temperature,the existence of heat exchange in the device and the operation mode of different heat exchangers.The research shows that with the decrease of the primary water inlet temperature and flow rate of the heat exchanger,the maximum heat exchange power of the main heat exchanger decreases significantly.Under the condition of serious deviation from the design condition,there is a risk that the heat exchange capacity of the main heat exchanger can not meet the irradiation operation of the fuel assembly.At the same time,the internal heat exchange of the irradiation device is extremely disadvantageous to the heat exchange of the main heat exchanger.Under the condition that the operating temperature of the loop is high and the internal heat exchange is strong,the design margin of the secondary water flow of the main heat exchanger shall not be lower than the heat exchange ratio in the device,and the margin shall be larger.The advantages of parallel operation of two main heat exchangers are mainly reflected in the large primary water flow,and there is a small primary water flow,which makes the heat exchange capacity of single heat exchanger running independently consistent with that of two heat exchangers running in parallel.When the flow ratio is lower than this,the heat exchange capacity of two heat exchangers running in parallel is weaker than that of single heat exchanger.

关 键 词：燃料组件 稳态回路辐照考验 热工参数 换热器 

分 类 号：TL352[核科学技术—核技术及应用]