Study and Verification of Diagnosis Method for Secondary Neutron Source Breakage
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摘要: 压水堆核电机组使用的二次中子源存在破损风险，反应堆功率运行工况下无法对二次中子源的状态进行物理检查。根据二次中子源的活化特性将122Sb和124Sb作为诊断二次中子源破损的特征核素，对使用一回路冷却剂的γ放射性在线监测数据、一回路冷却剂中122Sb和124Sb的比活度诊断二次中子源破损的方法可行性进行了分析，设计了二次中子源破损诊断流程，并使用上述诊断方法对二代改进型1000 MW级压水堆核电机组二次中子源破损问题进行了诊断。验证结果表明，二次中子源破损后一回路冷却剂取样分析得出的122Sb和124Sb比活度变化趋势与核辐射监测设备监测到的一回路冷却剂γ放射性变化趋势在总体上吻合。因此，本研究提出的二次中子源破损诊断方法是有效的。Abstract: The secondary neutron source used in the PWR nuclear power unit has a risk of breakage. Physical inspection of the status of the secondary neutron source is not possible at reactor power operation condition. According to the activation characteristics of the secondary neutron source, 122Sb and 124Sb are used as the characteristic nuclides to diagnose the damage of the secondary neutron source. The feasibility of the method for diagnosing the damage of secondary neutron source by using the on-line monitoring data of γ radioactivity of primary coolant and the specific activity of 122Sb and 124Sb in primary coolant is analyzed, the secondary neutron source damage diagnosis process is designed, and the secondary neutron source damage problem of the second generation improved 1000 MW PWR nuclear power unit is diagnosed using the above diagnosis methods. The verification results show that the specific activity change trend of 122Sb and 124Sb obtained by the primary coolant sampling analysis after the damage of the secondary neutron source should be consistent with the γ radioactivity change trend of the primary coolant monitored by the nuclear radiation monitoring equipment.Therefore, the secondary neutron source damage diagnosis method proposed in this study is effective.
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Key words:
- Reactor /
- Secondary neutron source /
- Breakage /
- Diagnosis /
- Specific activity /
- γ radioactivity
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图 2 一回路冷却剂γ放射性异常变化曲线
Figure 2. Abnormal Changing Curve of Primary Loop Coolant γ Radioactivity
图 3 一回路冷却剂Sb的比活度异常变化曲线
Figure 3. Abnormal Changing Curve of Specific Activity of Sb in Primary Loop Coolant
表 1 报警阈值
Table 1. Alarm Threshold
通道编号 一级报警阈值/(Gy·h−1) 二级报警阈值/(Gy·h−1) KRT001MA 6.0×10−4 1.3×10−3 KRT026MA 2.5×10−4 2.0×10−3 
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