Study on Fundamental Processes of Formation, Conversion and Dissolution of Crud in Nuclear Reactor Environments.

核反应堆环境中凝结物形成、转化和溶解的基本过程研究。

• 批准号: 01580217
• 负责人: OHASHI Hiroshi
• 金额: $ 1.22万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01580217/
• 关键词: Simulated crud; Magnetite; Nickel ferrite; Cobalt ferrite; Formation and conversion; Dissolution; Chemical decontamination; Data base; クラッド; 原子炉水化学; メスバウァ分光; 原子炉一次冷却回路; フェライト系酸化物; 生成と変換; デ-タベ-ス

1) Formation and characterization of simulated crud : Magnetite with different composition was prepared by five different methods, and reactivities of various iron oxides and hydroxides with Ni(OH)_2 and Co(OH)_2 were investigated. The reactivity of gamma-FeOOH with Ni(OH)_2 and Co(OH)_2 was extremely high, and gamma-FeOOH formed NiFe_2O_4 and CoFe_2O_4 at 150-300ﾟC.The reactivities of alpha-FeOOH and alpha-Fe_2O_3 with Ni(OH)_2 were low, but fine alpha-FeOOH and alpha-Fe_2O_3 were reactive towards Ni(OH)_2. Fe_3O_4 did not react with either Ni(OH)_2 or Co(OH)_2.2) Dissolution mechanism of magnetite : Conditions of solutions (pH, concentrations of hydrazine and EDTA, and temperature) against dissolution rates of magnetite were investigated and the mechanism of dissolution was estimated. In the solutions wit13EA\ : hout hydrazine, dissolution rates of magnetite obeyed to parabolic rate law in pH 5-10. At pH 4, dissolution proceeded in two stages ; the first stage obeyed paraboric rate l … More aw, and the second the rate law with time exponent of 2. In the solutions c13EA\ : ntaining hydrazine, dissolution proceeded in two stages ; the first stage obeyed the parabolic rate law, and the second stage linear rate law at concentrations of 0.001-0.003 mol dm^<-3>, and the first stage obeyed linear rate law, and the second sta13EA\ : ge the rate law with time exponent of 2 at the concentrations of 0.005-0.010 mol dm^<-3>.3) Construction of data base in connection with chemical decontamination : The construction of a data base of the formation, conversion, dissolution and decontamination of crud was attempted in connection with the chemical decontamination of coolant13EA\ : circuits of water-cooled nuclear rreactors. In addition, the results of searches about the formation and conversion of various iron oxides, and the formation of spinel compounds were demonstrated in connection with crud formation. The searches were13EA\ : also carried out on the modelling of crud behaviors, the activation of crud and the decontamination of coolant circuits of reactors. Less

1)模拟垢的形成与表征：采用五种不同的方法制备了不同组成的磁铁矿，考察了各种铁氧化物和氢氧化物与Ni（OH）_2和Co（OH）_2的反应性。γ-FeOOH与Ni（OH）_2和Co（OH）_2的反应活性极高，在150-300 ℃时生成NiFe_2O_4和CoFe_2O_4，α-FeOOH和α-Fe_2O_3与Ni（OH）_2的反应活性较低，而细α-FeOOH和α-Fe_2O_3与Ni（OH）_2有反应活性。Fe_3O_4不与Ni（OH）_2或Co（OH）_2发生反应。2）磁铁矿的溶解机理：考察了溶液的pH值、肼浓度、EDTA浓度和温度对磁铁矿溶解速率的影响，并对磁铁矿的溶解机理进行了估计。在pH 5 ~ 10范围内，磁铁矿在含13 EA的无肼溶液中的溶解速率服从抛物线规律。在pH 4时，溶出分两个阶段进行，第一阶段服从偏硼酸速率， ...更多信息 aw，第二个是时间指数为2的速率定律。在含肼溶液中，溶解分两个阶段进行，在肼浓度为0.001- 0.003moldm ↑ [3]范围内，第一阶段服从抛物线速率定律，第二阶段<-3>服从线性速率定律，第一阶段服从线性速率定律，第二阶段服从线性速率定律。在浓度为0.005-0.010 mol/dm ~ 2时，获得时间指数为2的速率定律<-3>。3）与化学去污有关的数据库的建立：在对冷却剂13 EA进行化学去污的同时，尝试建立污垢的形成、转化、溶解和去污的数据库：水冷核反应堆的电路。此外，各种铁氧化物的形成和转化以及尖晶石化合物的形成的研究结果与积垢的形成有关。此外，还对反应堆冷却剂回路的积垢行为模拟、积垢活化和去污进行了研究。少

项目成果

大橋 弘士,諸住 高,宮下 茂: "模擬クラッドの生成とキャラクタリゼ-ション" 材料と環境. 40. (1991)

Hiroshi Ohashi、Takashi Morozumi 和 Shigeru Miyashita：“模拟包层的生成和表征”材料与环境 40。（1991）。

大橋 弘士,諸住 高,村 直美: "マグネタイトの溶解反応機構" 材料と環境. 40. (1991)

Hiroshi Ohashi、Takashi Morozumi、Naomi Mura：“磁铁矿的溶解反应机理”40。（1991）。