Study on the Steady γ-Radiolysis of Ammonia Solution

被引：0

作者：

Guo Z. ^{[1
]}

Yang Y. ^{[1
,2
]}

Lin M. ^{[1
]}

Cao Q. ^{[2
]}

Tang J. ^{[2
]}

Lin Y. ^{[1
]}

Lin Z. ^{[1
]}

机构：

[1] School of Nuclear Science and Technology, University of Science and Technology of China, Hefei

[2] Nuclear Power Institute of China, Chengdu

来源：

Hedongli Gongcheng/Nuclear Power Engineering | 2023年 / 44卷 / 03期

关键词：

Ammonia; Coolant; Radiolysis; Reactor; Water chemistry;

D O I：

10.13832/j.jnpe.2023.03.0217

中图分类号：

学科分类号：

摘要：

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. © 2023 Yuan Zi Neng Chuban She. All rights reserved.

引用

页码：217 / 222

页数：5

共 19 条

[1] WREN J C., Steady-state radiolysis: effects of dissolved additives, pp. 271-295, (2010)
[2] UCHIDA S, KATSUMURA Y., Water chemistry technology – one of the key technologies for safe and reliable nuclear power plant operation, Journal of Nuclear Science and Technology, 50, 4, pp. 346-362, (2013)
[3] ELLIOT A, BARTELS D., The reaction set, rate constants and g-values for the simulation of the radiolysis of light water over the range 20℃ to 350℃ based on information available in 2008: AECL-153-127160-450-001, (2009)
[4] DAUB K, ZHANG X, NOEL J J, Et al., Effects of γradiation versus H2O2 on carbon steel corrosion, Electrochimica Acta, 55, 8, pp. 2767-2776, (2010)
[5] BULANOV A V, KOLESOV B I, LUKASHENKO M L, Et al., Radiolysis of ammonia in the first-loop coolant of reactors in floating power-generating units, Atomic Energy, 88, 5, pp. 368-372, (2000)
[6] HICKEL B, SEHESTED K., Reaction of hydroxyl radicals with ammonia in liquid water at elevated temperatures, International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 39, 4, pp. 355-357, (1992)
[7] PAGSBERG P B., Investigation of the NH2 radical produced by pulse radiolysis of ammonia in aqueous solution: RISØ-256, (1972)
[8] NETA P, MARUTHAMUTHU P, CARTON P M, Et al., Formation and reactivity of the amino radical, The Journal of Physical Chemistry, 82, 17, pp. 1875-1878, (1978)
[9] LUZAKOV A V, BULANOV A V, VERKHOVSKAYA A O, Et al., Radiation-chemical removal of corrosion hydrogen from VVER first-loop coolant, Atomic Energy, 105, 6, pp. 402-407, (2008)
[10] RIGG T, SCHOLES G, WEISS J., 580. Chemical actions of ionising radiations in solutions. Part X. The action of X-rays on ammonia in aqueous solution, Journal of the Chemical Society (Resumed), pp. 3034-3038, (1952)

← 1 2 →