Evaluation of <sup>99</sup>Mo production based on molten salt reactor off-gas extraction

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

Table 2. Main models parameters

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Table 2. Main models parameters

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

Table 3. Deposition comparison of calculated and reference values (%) during ²³⁵U operation

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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	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

Table 4. Deposition comparison of calculated and reference values (%) during ²³³U operation

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Table 4. Deposition comparison of calculated and reference values (%) during ²³³U 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

Table 5. Information on Mo isotopes

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Table 5. Information on Mo isotopes

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

Table 6. Yield of the main radioisotopes of Mo
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Table 6. Yield of the main radioisotopes of Mo
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

Table 7. Yield of the main stable isotopes of Mo
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Table 7. Yield of the main stable isotopes 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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Liang CHEN, Guifeng ZHU, Ziye WANG, Rui YAN, Yang ZOU, Hongjie XU. Evaluation of ⁹⁹Mo production based on molten salt reactor off-gas extraction[J]. NUCLEAR TECHNIQUES, 2024, 47(8): 080604

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Paper Information

Category: NUCLEAR ENERGY SCIENCE AND ENGINEERING

Received: Nov. 2, 2023

Accepted: --

Published Online: Sep. 23, 2024

The Author Email: YAN Rui (严睿), ZOU Yang (邹杨)

DOI:10.11889/j.0253-3219.2024.hjs.47.080604

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Fission yield of 99Mo and its precursors

Table 1. Fission yield of 99Mo and its precursors

Table 2. Main models parameters

Table 2. Main models parameters

Table 3. Deposition comparison of calculated and reference values (%) during 235U operation

Table 3. Deposition comparison of calculated and reference values (%) during 235U operation

Table 4. Deposition comparison of calculated and reference values (%) during 233U operation

Table 4. Deposition comparison of calculated and reference values (%) during 233U operation

Table 5. Information on Mo isotopes

Table 5. Information on Mo isotopes

Table 6. Yield of the main radioisotopes of Mo

Table 6. Yield of the main radioisotopes of Mo

Table 7. Yield of the main stable isotopes of Mo

Table 7. Yield of the main stable isotopes of Mo

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Table 1. Fission yield of ⁹⁹Mo and its precursors

Table 1. Fission yield of ⁹⁹Mo and its precursors

Table 3. Deposition comparison of calculated and reference values (%) during ²³⁵U operation

Table 3. Deposition comparison of calculated and reference values (%) during ²³⁵U operation

Table 4. Deposition comparison of calculated and reference values (%) during ²³³U operation

Table 4. Deposition comparison of calculated and reference values (%) during ²³³U operation