Study on Fine Calculation of Deposition Source Terms in HFETR Test Loop
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摘要: 计算高通量工程试验堆（HFETR）考验回路中活化腐蚀产物产生的沉积源项对于指导工作人员剂量估算及设施退役意义重大。在CATE程序输运机理模型及计算程序基础上，对HFETR考验回路进行节点划分及输运参数确定，建立了考验回路的9节点输运模型，模拟实际运行条件下考验回路活化腐蚀产物沉积源项的产生及分布，并与实际监测数据进行对比验证。研究结果表明，模型计算结果与活化腐蚀产物迁移方向的净效应一致，证明了计算结果的可靠性；模型中沉积源项的剂量率误差在30%内且计算结果偏保守，证明了计算结果的准确性。本研究证明了考验回路沉积源项的多节点计算方法在试验堆复杂的运行条件下是适用的，具有较大的工程应用价值。Abstract: It is of great significance to calculate the deposition source term produced by activated corrosion products in HFETR test loop for guiding dose estimation and decommissioning of facilities. In this paper, the test loop is divided into nodes and transport parameters are determined based on the CATE transport mechanism model and computation code. A 9-node transport model of the test loop is established to simulate the generation and distribution of activated corrosion product source terms of the test loop under actual operating conditions, and the results are compared with the actual monitoring data. The research results indicate that the calculation results of the model are consistent with the net effect of the migration direction of activated corrosion products, which proves the reliability of the calculated results. The dose rate error of the source term in the model is within 30% and the calculation results are conservative , which proves the accuracy of the calculated results. This study proves that the multi-node calculation method of the deposition source term in the test loop is applicable under the complex operating conditions of the test reactor and has great engineering application value.
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Key words:
- Activation /
- Corrosion /
- Deposition /
- Radioactive retention /
- Dose rate
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图 2 9节点输运模型中活化腐蚀产物产生迁移机理
Figure 2. Migration Mechanism of Activated Corrosion Products in 9-node Transport Model
表 1 考验回路停堆时刻活化腐蚀产物沉积源项计算结果
Table 1. Calculation Results of Deposition Source Term of Activated Corrosion Products at Shutdown Time of Test Loop
节点区域 表面活度/(Bq·m−2) 活度/Bq 辐照考验装置 1.33×1012 1.58×1012 热管段 5.51×108 2.39×109 主热交换器 1.48×108 8.01×109 过渡段 4.98×108 2.39×109 主泵 3.11×108 5.15×107 冷管段 4.91×108 1.03×109 总量 2.40×1010 1.60×1012 
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表 2 考验回路停堆时刻活化腐蚀产物液态源项计算结果
Table 2. Calculation Results of Liquid Source Term of Activated Corrosion Products at Shutdown Time of Test Loop
节点区域 比活度/(Bq·m−3) 活度/Bq 冷却剂 2.06×107 1.03×107 离子柱 9.34×1010 4.67×109 总量 8.51×109 4.68×109
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表 3 监测数据和计算结果对比
Table 3. Comparison of Monitoring Data and Calculated Results
监测点位 液态源项剂量率
计算结果/(μSv·h−1)沉积源项剂量率
计算结果/(μSv·h−1)净化系统源项剂量率
计算结果/(μSv·h−1)剂量率计算结
果/(μSv·h−1)剂量率监测数
据/(μSv·h−1)误差/% 主泵旁固定γ探头处 0.21 6.74 0.009 6.95 6 15.91 装置出口至主热交换器的管线 1.75 58.59 0.015 60.36 55 9.74 离子柱下方 0.07 2.97 90.536 93.57 72 29.96 离子柱上方管道 1.13 44.18 0.655 45.97 43 6.90
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