Microstructural characterization of as-cast U-20Pu-10Zr-3.86Pd and U-20Pu-10Zr-3.86Pd-4.3Ln

JOURNAL OF NUCLEAR MATERIALS

卷:508

Article

Benson, Michael T.¹  He, Lingfeng¹  King, James A.¹  Mariani, Robert D.¹  Winston, Alexander J.¹  Madden, James W.¹ 

[1] Idaho Natl Lab, POB 1625,MS 6188, Idaho Falls, ID 83415 USA

关键词: Metallic fuel;    FCCI;    Fuel additive;    Transmutation fuel;   

DOI  :  10.1016/j.jnucmat.2018.05.062

来源: Elsevier

【 摘 要 】

Palladium is being investigated as a potential additive to metallic fuel to bind fission product lanthanides, with the goal of reducing or preventing fuel-cladding chemical interactions (FCCI). A primary cause of FCCI is the lanthanide fission products moving to the fuel periphery and interacting with the cladding. This interaction will lead to wastage of the cladding and eventually to a cladding breach. The current study is a scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigation of as-cast U-20Pu-10Zr-3.86Pd and U-20Pu-10Zr-3.86Pd-4.3Ln in wt. %, where Ln = 53Nd-25Ce-16Pr-6La. In U-20Pu-10Zr-3.86Pd, PdZr2 is forming, along with a possible ternary phase between Pu, Zr, and Pd. Pu is also present in the Pd-Ln precipitates formed in U-20Pu-10Zr-3.86Pd-4.3Ln. In the LnPd phase, Pu appears to be substitutional, forming (Ln, Pu) Pd. The other prominent phase, which appears to be Ln(7)Pd(3), has a fine, lamellar structure. The lanthanides remain essentially constant across this fine structure, but Pu and Pd alternate as to which has the higher concentration. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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