Liang CHEN1,2, Guifeng ZHU1,2, Ziye WANG1,3, Rui YAN1,2,*..., Yang ZOU1,2,** and Hongjie XU1,2,3|Show fewer author(s)
Author Affiliations
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China2University of Chinese Academy of Sciences, Beijing 100049, China3ShanghaiTech University, Shanghai 201210, Chinashow less
Fig. 1. Diagram of decay-transmutation chain of 99Mo
Fig. 2. Schematic of the main loop of the MSRE
Fig. 3. Inventory change of 99Mo in the reactor and off-gas system with time
Fig. 4. Percentage of 99Mo(og) to 99Mo(tot) and specific 99Mo(og) vs. bubble removal efficiency
Fig. 5. Percentage of Mo(og) isotopes to Mo(tot) isotopes and specific 99Mo(og) vs. core void fractions
Fig. 6. Percentage of 99Mo(og) to 99Mo(tot) and specific 99Mo(og) vs. solubility of 99Mo
核素 Nuclide | 半衰期 Half life | 独立产额 Independent yield | 累积产额 Cumulated yield | 衰变产额占比 Decay yield/cumulated yield / % |
|---|
| 99Zr | 2 s | 3.58×10‒4 | 5.63×10‒2 | 63.60 | | 99Nb | 15 s | 3.00×10‒4 | 2.10×10‒2 | 80.60 | | 99mNb | 150 s | 4.07×10‒3 | 3.97×10‒2 | 99.25 | | 99Mo | 2.75 d | 4.28×10‒4 | 6.11×10‒2 | 99.30 |
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Table 1. Fission yield of 99Mo and its precursors
区域 Section of reactor | 体积 Volume / m3 | 表面积 Surface area / m2 | 传质系数 Mass transfer coefficient / m‧s‒1 |
|---|
| 换热器 HX | 0.173 | 29.3 | 5.3×10‒5 | | 管道 Piping | 0.144 | 4.5 | 1.0×10‒4 | | 堆芯 Core | 0.708 | 136.0 | 5.3×10‒6 | | 环腔 Vessel walls | 0.275 | 19.3 | 4.3×10‒5 | | 气泡 Circle bubbles，U-235 | 0.000 684 | 7.9 | 4.2×10‒4 | | 气泡 Circle bubbles，U-233 | 0.011 4 | 44.7 | 4.2×10‒4 |
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Table 2. Main models parameters
| 区域Section of reactor | MSRE | VERA-CS | MSRTE |
|---|
| 换热器 HX surfaces | 40 | 40.37 | 37.64 | | 其他哈氏合金表面 Other Hastelloy surfaces | 50 | 50.35 | 51.30 | | 堆芯石墨 Core graphite surfaces | 1 | 0.08 | 2.06 | | 泵及其他气相区域 Pump bowl, off-gas, etc. | 9 | 9.00 | 9.00 |
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Table 3. Deposition comparison of calculated and reference values (%) during 235U operation
| 区域Section of reactor | MSRE | VERA-CS | MSRTE |
|---|
| 换热器 HX surfaces | 6 | 6.26 | 6.00 | | 其他哈氏合金表面 Other Hastelloy surfaces | 8 | 7.73 | 8.04 | | 堆芯石墨 Core graphite surfaces | 0.4 | 0.01 | 0.36 | | 泵及其他气相区域 Pump bowl, off-gas, etc. | 85.6 | 86.0 | 85.6 |
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Table 4. Deposition comparison of calculated and reference values (%) during 233U operation
| 核素 Nuclide | 衰变类型 Decay mode | 半衰期 Half life | 累积产额Cumulative yield |
|---|
| 97Mo | — | 稳定 stable | 6.00×10‒2 | | 98Mo | — | 稳定 stable | 5.79×10‒2 | | 99Mo | β‒ | 2.75 d | 2.10×10‒2 | | 100Mo | — | 7.30×1018 a | 6.29×10‒2 | | 101Mo | β‒ | 14.61 min | 5.17×10‒2 | | 102Mo | β‒ | 11.30 min | 4.28×10‒2 | | 103Mo | β‒ | 67.50 s | 2.95×10‒2 | | 104Mo | β‒ | 60.00 s | 1.79×10‒2 | | 105Mo | β‒ | 35.60 s | 9.16×10‒3 |
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Table 5. Information on Mo isotopes
核素 Nuclide | 平衡时间 Equilibrium time | 活度 Activity / Bq |
|---|
| 99Mo | 22 d | 6.93×1013 | | | 101Mo | 140 min | 1.59×1011 | | | 102Mo | 172.5 min | 9.32×1010 | | | 103Mo | 20 min | 1.50×109 | | | 104Mo | 20 min | 7.30×108 | | | 105Mo | 10 min | 1.40×108 | |
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Table 6. Yield of the main radioisotopes of Mo
核素 Nuclide | 平衡时间 Equilibrium time | 粒子数 Particle number |
|---|
| 97Mo | — | 3.34×1020 | | 98Mo | — | 3.40×1020 | | 99Mo | 22 d | 6.93×1013 | | 100Mo | — | 3.81×1020 |
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Table 7. Yield of the main stable isotopes of Mo
