γ辐照条件下硼-锂-氨型冷却剂的辐射分解行为  

γ-radiolysis of boric acid-lithium hydroxide-ammonia coolant

作　　者：曹骐[1,2] 杜香怡 郭子方 林子健 杨雨 朱伟 林铭章[2] CAO Qi;DU Xiangyi;GUO Zifang;LIN Zijian;YANG Yu;ZHU Wei;LIN Mingzhang(Nuclear Power Institute of China,Chengdu 610213,China;School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国核动力研究设计院,成都610213 [2]中国科学技术大学核科学技术学院,合肥230026

出　　处：《辐射研究与辐射工艺学报》2023年第3期11-16,共6页Journal of Radiation Research and Radiation Processing

基　　金：“十四五”装备预研专用技术(2102020502);“叶企孙”科学基金(U2241289)资助。

摘　　要：本文探究了γ辐射场下新型冷却剂硼-锂-氨的辐射分解行为,主要考察了不同硼-锂浓度、吸收剂量和吸收剂量率对辐解产物H_(2)O_(2)、NO_(2)^(−)和NO_(3)^(−)的浓度影响。实验结果表明:在常规的压水堆运行pH范围内(pH300℃=7.1~7.3),随着硼酸浓度增加,冷却剂体系的H_(2)O_(2)和NO_(2)^(−)浓度没有明显变化,其中H2O2的浓度范围在9.28×10^(-5)~1.07×10^(-4)mol/L之间,NO_(2)^(−)浓度范围为9×10^(-6)~1.5×10^(-5)mol/L;NO_(3)^(−)浓度相较于前两个产物波动较大,为4×10^(-5)~8×10^(-5)mol/L。随着吸收剂量增加(1~30 kGy),硼-锂-氨体系中的H_(2)O_(2)和NO_(2)^(−)的平衡浓度增加,分别为1.28×10^(-4)mol/L和1.30×10^(-5)mol/L,NO_(3)^(−)的浓度未明显变化(4×10^(-5)~6×10^(-5)mol/L)。在本工作探究的吸收剂量率范围内(1.27~18.86 Gy/min),H_(2)O_(2)、NO_(2)^(−)和NO_(3)^(−)的浓度均未因吸收剂量率增加而受到显著影响。本工作为新型冷却剂硼-锂-氨体系的实际应用提供了有参考价值的基础数据。In this study,theγ-radiolysis of boric acid-lithium hydroxide-ammonia coolant was investigated under different conditions,including boric acid concentration,absorbed dose,and absorbed dose rate.The concentrations of H_(2)O_(2),NO_(2)^(−),and NO_(3)^(−)were determined using UV-visible spectroscopy and ion chromatography.With an increase in boric acid concentration,the concentrations of H_(2)O_(2)and NO_(2)^(−)in the coolant system did not change significantly within a pH range commonly used in pressurized water reactor operation.Specifically,the concentration of H_(2)O_(2)varied from 9.28×10^(-5)to 1.07×10^(-4)mol/L,while that of NO_(2)^(−)changed from 0.9×10^(-5)to 1.5×10^(-5)mol/L.In contrast,the concentration of NO3−fluctuated significantly,ranging from 4×10^(-5)to 8×10^(-5)mol/L.With an increase in the absorbed dose(1−30 kGy),the equilibrium concentration of H_(2)O_(2)and NO_(2)^(−)in boric acid-lithium hydroxide-ammonia system increased to 1.28×10^(-4)mol/L and 1.30×10^(-5)mol/L,respectively.Meanwhile,the concentration of NO3−did not change significantly(4×10^(-5)to 6×10^(-5)mol/L).The concentrations of the three radiolytic products were not significantly affected within the given absorbed dose rate range(1.27 to 18.86 Gy/min).Overall,this work provides valuable basic data for optimizing the new boric acid-lithium hydroxide-ammonia coolant system.

关 键 词：硼酸 氢氧化锂 氨 冷却剂 辐射分解 

分 类 号：Q691.1[生物学—生物物理学]