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Surface Characterization of Metallic Fuel Slugs Prepared by Modified Injection Casting

Mun Seung-Uk Kim Ki-Hwan Oh Seok-Jin Park Jeong-Young Hong Sun-Ig
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 2 | DOI: 10.24425/122441
Keywords Sodium-cooled fast reactor metallic fuel slug U-Zr alloy surface characterization injection casting
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Abstract

Metallic fuel slugs containing rare-earth (RE) elements have high reactivity with quartz (SiO2) molds, and a reaction layer with a considerable thickness is formed at the surface of metallic fuel slugs. The surface characterization of metallic fuel slugs is essential for safety while operating a fast reactor at elevated temperature. Hence, it is necessary to evaluate the surface characteristics of the fuel slugs so that chemical interaction between fuel slug and cladding can be minimized in the reactor. When the Si element causes a eutectic reaction with the cladding, it deteriorates the metallic fuel slugs. Thus, it is necessary to examine the characteristics of the surface reaction layer to prevent the reaction of the metallic fuel slugs. In this study, we investigated the metallurgical characteristics of the surface reaction layer of fabricated U-10wt.%Zr-Xwt.%RE (X = 0, 5, 10) fuel slugs using injection casting. The results showed that the thickness of the surface reaction layer increased as the RE content of the metallic fuel slugs increased. The surface reaction layer of the metallic fuel slug was mainly formed by RE, Zr and the Si, which diffused in the quartz mold.
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Authors and Affiliations

Mun Seung-Uk
Kim Ki-Hwan
Oh Seok-Jin
Park Jeong-Young
Hong Sun-Ig

Microstructural Characterization of U-10wt.%Zr Fuel Slugs Containing Rare-Earth Elements Prepared by Modified Injection Casting

Sang-Hun Lee Ki-Hwan Kim Seoung-Woo Kuk Jeong-Yong Park Ji-Hoon Choi
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 3 | 953-957 | DOI: 10.24425/amm.2019.129479
Keywords U-Zr Rare-earth element Microstructure injection casting Sodium-cooled Fast Reactor (SFR)
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Abstract

U-10wt.%Zr metallic fuel slugs containing rare-earth (RE: a rare-earth alloy comprising 53% Nd, 25% Ce, 16% Pr and 6% La) elements for a sodium-cooled fast reactor were fabricated by modified injection casting as an alternative method. The distribution, size and composition of the RE inclusions in the metallic fuel slugs were investigated according to the content of the RE inclusions. There were no observed casting defects, such as shrunk pipes, micro-shrinkage or hot tears formed during solidification, in the metallic fuel slugs fabricated by modified injection casting. Scanning electron micrographs and energy-dispersive X-ray spectroscopy (SEM-EDS) showed that the Zr and RE inclusions were uniformly distributed in the matrix and the composition of the RE inclusions was similar to that of a charged RE element. The content and the size of the RE inclusions increased slightly according to the charge content of the RE elements. RE inclusions in U-Zr alloys will have a positive effect on fuel performance due to their micro-size and high degree of distribution.

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Authors and Affiliations

Sang-Hun Lee
Ki-Hwan Kim
Seoung-Woo Kuk
Jeong-Yong Park
Ji-Hoon Choi

Preliminary Study of Frequency-Variable Vibration Packing Fabrication for Atomized Metallic Particulate Fuel Using Surrogate Spherical Powder

Ki-Hwan Kim Seong-Jun Ha Sang-Gyu Park Seoung-Woo Kuk Jeong-Yong Park
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1043-1047 | DOI: 10.24425/amm.2021.136422
Keywords Atomized powder Injection casting Metallic particulate fuel Alternative fabrication method Vibration packing
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Abstract

An alternative fabrication method for metallic fuel in Gen-IV reactor was introduced with vibration packing of nuclear fuel particles to facilitate remote fabrication in a hot cell and reduce the generation of long-lived radioactive wastes. Vibration packing experiments on metallic particulate fuel using a surrogate 316L stainless steel powder were done to investigate the packing density and the uniformity of the simulated fuel according to the filling method and the vibration condition. Metallic particulate fuel filled with a pre-mixed power over all particles had the highest packing fraction and the most uniform distribution among the filling methods. The vibration packing method showed that it could fabricate the metallic particulate fuel having uniform distribution of spherical fuel particles through the adjustment of the filling method of the metallic powder and the vibration condition of the metallic particulate fuel.
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Authors and Affiliations

Ki-Hwan Kim
1
ORCID: ORCID
Seong-Jun Ha
1
Sang-Gyu Park
1
Seoung-Woo Kuk
1
Jeong-Yong Park
1
  1. Korea Atomic Energy Research Institute, Next-Generation Fuel Technology Development Division, 989-111, Daedeok-daero, Yuseong-gu, Daejeon, 34057, Republic of Korea

The use of DSC curves and the Kronmüller theory to study the level of structural defects of Fe-based bulk amorphous alloys

Bartłomiej Jeż Marcin Nabiałek
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144613 | DOI: 10.24425/bpasts.2023.144613
Keywords injection-casting method bulk amorphous alloys soft magnetic materials free volume structural defects
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Abstract

This article presents the results of tests carried out on rapid quenched Fe-based alloys. The alloys were made using an injection-casting method. The actual structure of the alloys was also studied using an indirect method, based on H. Kronmüller's theorem. Based on analysis of the primary magnetization curves, in accordance with the aforementioned theory, it was found that Mo causes a change in internal regions associated with changes in the direction of the magnetization vector. The evolution of the thermal properties with increasing volume of Mo has been confirmed by the DSC curves. Addition of Mo, at the expense of the Nb component, results in changes to the crystallization process (i.e. the crystallization onset temperature and number of stages). The study showed that the addition of Mo at the expense of Nb reduces glass forming ability. Based on the DSC analysis, free volumes were determined for the alloys tested. These values were compared with the analysis of primary magnetization curves. It was found that the DSC curves can be used to indirectly describe the structure of amorphous alloys similar to the theory of the approach to ferromagnetic saturation. This approach is new and can be used by many researchers in this field.
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Authors and Affiliations

Bartłomiej Jeż
1
ORCID: ORCID
Marcin Nabiałek
2
ORCID: ORCID
  1. Department of Technology and Automation, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, al. Armii Krajowej 19c, 42-200 Czestochowa, Poland
  2. Department of Physics, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Cz ̨estochowa, Poland

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