氨水溶液在γ场中的稳态辐射分解行为研究

郭子方; 杨雨; 林铭章; 曹骐; 汤嘉; 林蕴良; 林子健

doi:10.13832/j.jnpe.2023.03.0217

氨水溶液在γ场中的稳态辐射分解行为研究

doi: 10.13832/j.jnpe.2023.03.0217

郭子方^1,,
杨雨^{1, 2},
林铭章^1, ,,
曹骐²,
汤嘉²,
林蕴良¹,
林子健¹

1.
中国科学技术大学核科学技术学院，合肥，230026
2.
中国核动力研究设计院，成都，610213

基金项目: 国家自然科学基金（11775214）

详细信息

作者简介:
郭子方（1995—），男，博士研究生，现主要从事水溶液辐射化学研究，E-mail: gzf1212@mail.ustc.edu.cn

通讯作者:
林铭章，E-mail: gelin@ustc.edu.cn

中图分类号: TL99；O644
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-01
- 修回日期: 2022-07-13
- 刊出日期: 2023-06-15

Study on the Steady γ-Radiolysis of Ammonia Solution

Guo Zifang^1
,,
Yang Yu^{1, 2},
Lin Mingzhang^{1
, ,},
Cao Qi²,
Tang Jia²,
Lin Yunliang¹,
Lin Zijian¹

1.
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 含氨冷却剂被应用于压水堆中，可以清除冷却剂辐射分解产生的O₂、H₂O₂等氧化性产物，从而减轻结构材料腐蚀。本文研究了氨水在γ辐射场中的辐射分解行为，考察氨浓度、辐射吸收剂量和吸收剂量率、气液体积比和不同饱和气体对氨水辐射分解行为的影响，重点关注辐射分解产物H₂O₂和NO₂⁻的浓度变化。结果表明，随着体系中氨浓度的增加，H₂O₂的浓度受到明显抑制，NO₂⁻的浓度则呈现出上升趋势；吸收剂量的增加使得H₂O₂浓度明显升高，NO₂⁻的浓度则在吸收剂量为8 kGy时达到最大（> 100 μmol/L），而后降低；吸收剂量率的差异（2.78~25 Gy/min）并未导致H₂O₂和NO₂⁻浓度产生明显变化；氨水中的O₂是NO₂⁻生成的关键，但O₂过多会促进NO₂⁻氧化为NO₃⁻从而降低NO₂⁻浓度，此外O₂的存在促进了H₂O₂的生成。本文研究结果可为后续含氨冷却剂体系的优化提供参考。
- 氨 /
- 冷却剂 /
- 辐射分解 /
- 反应堆 /
- 水化学
Abstract: Ammonia is applied in the coolant to eliminate the O₂ and H₂O₂ in the PWR, thus mitigating the corrosion of structural materials. The present work studied the γ-radiolysis of ammonia solution under different conditions including ammonia concentration, absorbed dose, absorbed dose rate, gas-liquid volume ratio, and different saturated gases. The results show that ammonia significantly inhibits H₂O₂ because of the consumption of H₂O₂ and suppression of its precursors. The concentration of NO₂⁻ rises with the ammonia concentration . Ammonia is continuously consumed as irradiation progresses, while the concentration of H₂O₂ increases significantly with the absorbed dose. The NO₂⁻ reaches a peak maximum (> 100 μmol/L) when the absorbed dose is 8 kGy. However, NO₂⁻ has a drop when the absorbed dose grows further, due to the fact O₂ oxidizes NO₂⁻ into NO₃⁻. The concentrations of H₂O₂ and NO₂⁻ are not obviously affected within the absorbed dose rate range (2.78~25 Gy/min). The presence of O₂ is critical to the formation of NO₂⁻, though excessive O₂ in the system could lead to the oxidization of NO₂⁻ by increasing the oxidizing species. Besides, the oxygen dissolved in aqueous ammonia promotes the production of H₂O₂. This work is expected to provide a helpful reference for the optimization of the ammonia-containing coolant system.
- Ammonia /
- Coolant /
- Radiolysis /
- Reactor /
- Water chemistry

HTML全文

图 1 氨浓度对H₂O₂和NO₂⁻浓度的影响

Figure 1. Concentrations of H₂O₂ and NO₂⁻ under Different Ammonia Concentrations

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图 2 吸收剂量对H₂O₂和NO₂⁻浓度的影响

Figure 2. Concentrations of H₂O₂ and NO₂⁻ under Different Absorbed Doses

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图 3 吸收剂量率对H₂O₂和NO₂⁻浓度的影响

Figure 3. Concentrations of H₂O₂ and NO₂⁻ under Different Absorbed Dose Rates

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图 4 气液体积比对H₂O₂和NO₂⁻浓度的影响

Figure 4. Concentrations of H₂O₂ and NO₂⁻ under Different Gas-liquid Volume Ratios

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图 5 不同饱和气体对H₂O₂和NO₂⁻浓度的影响

Figure 5. Concentrations of H₂O₂ and NO₂⁻ under Different Saturated Gases

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