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- 저자 : Jiao Caishan (검색결과 3 건)
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Shen Yuan,Duan Zhengang,Lu Chuan,Ji Li,Jiao Caishan,Hou Hongguo,Chao Nan,Zhang Meng,Zhou Yu,Gao Yang 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
The porous corrosion deposits (known as CRUD) adhered to the cladding have an important effect on the heat transfer from fuel rods to coolant in PWRs. The vapor film is the main constituent in the two-phase film boiling model. This paper presents a vapor film thickness correlation, associated with CRUD porosity, CRUD chimney density, CRUD particle size, CRUD thickness and heat flux. The dependences of the vapor film thickness on the various influential factors can be intuitively reflected from this vapor film thickness correlation. The temperature, pressure, and boric acid concentration distributions in CRUD can be well predicted using the two-phase film boiling model coupled with the vapor film thickness correlation. It suggests that the vapor thickness correlation can estimate the vapor film thickness more conveniently than the previously reported vapor thickness calculation methods.
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Ultrasonic-assisted dissolution of U3O8 in carbonate medium
Hou Chenxi,He Mingjian,Fang Haofan,Zhang Meng,Gao Yang,Jiao Caishan,He Hui 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
Ultrasound-assisted dissolution of U3O8 powder in carbonate solution was explored to determine if and how ultrasound act during the dissolution. The variation of U3O8 solid particles and uranyl complexes under ultrasound treatment and magnetic stirring was observed in carbonate media. The results show that the use of ultrasound can increase the solubility and dissolution rate of U3O8 powder than that under magnetic stirring. The crush of U3O8 particles and the reduction of the activation energy (Ea, kJ/ mol) of U3O8 dissolution reaction were observed, which both play an important role in the ultrasonicassisted dissolution of U3O8 in carbonate-peroxide solution. Meanwhile, there is no observation of the ultrasound effect on the distribution of uranyl species and hydrolysis of uranyl complexes during the ultrasound treatment in carbonate-peroxide solution. Although the generation of $OH radicals under ultrasound (22 ± 2 kHz) was observed, the oxidation of $OH had little effect on the dissolution of U3O8 in the carbonate-peroxide solution system.
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Dissolution of synthetic U-DBP and corrosion of stainless steel by dissolution schemes
Wang Guanghui,Li Yaorui,He Mingjian,Zhang Meng,Gao Yang,He Hui,Jiao Caishan 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
In spent fuel reprocessing, UO2(DBP)2 (U-DBP) can be deposited in stainless steel equipment. U-DBP must be removed by dissolution and the process must not cause corrosion to stainless steel. This study was conducted to find the best scheme for dissolution. U-DBP was manufactured by the titrimetric sedimentation method. The effects of different factors on the dissolution of U-DBP were investigated. For example, solid-liquid ratio, hydrazine carbonate solutions with different mass components, mixed solutions containing different concentrations of H2O2, and different carbonates. The results indicated that U-DBP does not have a regular crystal morphology. With the increase of the solid-liquid ratio and the mass fraction of hydrazine carbonate, the concentration of U(VI) at the dissolution equilibrium increases gradually. The addition of H2O2 has a great promotion effect on the dissolution. However, when the concentration of H2O2 is greater than 0.5 M, the dissolution solution may have an erosive effect on the stainless steel. (NH4)2CO3 can increase the dissolution capacity of dissolved U-DBP, but it may also accelerate the corrosion of stainless steel.
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