Research on Airtightness Test of Habitable Zone in Main Control Room of HPR1000
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摘要: 基于恒定流量法，对主控室可居留区气密性试验从试验方法选择、示踪气体注入及取样方法、平衡浓度、试验结果计算等多个维度展开了研究，并在卡拉奇核电项目K2/K3机组进行了改进及应用。结果表明，通过研究正压与风量差值的关系，得出了执行试验的理想正压区间为35~50 Pa；通过研究示踪气体混合均匀性影响因素，确定了正压与内漏量的关系，并得出了执行试验的理想正压值约为50 Pa；通过研究正压与风量差值的关系，得出了执行试验的理想正压区间为35~50 Pa；在此基础上，通过示踪气体浓度数据对比分析，分析了浓度的波动幅度及规律，提出了促进示踪剂平衡的有效措施，即增加混流设备可以使示踪气体浓度充分均匀，减小浓度的波动幅度。Abstract: Based on the constant flow method, research was conducted on the airtightness test of the habitable area in the main control room from multiple dimensions such as test method selection, tracer gas injection, sampling method, equilibrium concentration, and calculation of test results. Improvements and applications were made to the K2/K3 unit of the Karachi nuclear power project. The results showed that by studying the factors affecting the uniformity of tracer gas mixing, the relationship between positive pressure and internal leakage was determined, and the ideal positive pressure value for conducting the experiment was approximately 50 Pa; By studying the relationship between positive pressure and air volume difference, it was found that the ideal positive pressure range for conducting the experiment is 35~50 Pa; By analyzing the relationship between positive pressure and internal leakage, the ideal positive pressure value for conducting the experiment was obtained; On this basis, through comparative analysis of tracer gas concentration data, the fluctuation amplitude and pattern of concentration were analyzed, and effective measures to promote tracer balance were proposed. That is, adding mixed flow equipment can make the tracer gas concentration fully uniform and reduce the fluctuation amplitude of concentration.
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Key words:
- Main control room /
- Habitable /
- Air tightness /
- Constant flow /
- Equilibrium concentration
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图 1 正压与风量差值关系曲线
Figure 1. Relationship Curve Between Positive Pressure and Air Volume Difference
图 2 K2机组试验正压与内漏量的关系
Figure 2. The Relationship Between Positive Pressure and Internal Leakage During K2 Unit Test
图 3 K2和K3机组SF6示踪气体浓度分布对比
Figure 3. Comparison of SF6 Tracer Gas Concentration Distribution Of K2 and K3 Units
图 4 K2/K3机组内漏量与设计内漏量对比
Figure 4. Comparison of Internal Leakage and Design Internal Leakage of K2/K3 Units
表 1 主控室可居留区气密性试验方法对比情况
Table 1. Comparison of Airtightness Test Methods for Habitable Areas in the Main Control Room
方法 优点 缺点 浓度衰减法 试验装置简单，试验精度高 ，时间短 不适用于复杂工况，需要测量主控室的自由容积 恒定浓度法 试验原理简单，计算方法简单 试验装置复杂，对试验设备要求高 恒定流量法 适用于复杂工况，适用于新风+回风运行，不需要测量主控室的自由容积 试验时间长，注入设备复杂、要求高 
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