TRISO coated fuel particles with enhanced SiC properties

López‐Honorato, Eddie; Tan, Jun; Meadows, P.J.; Marsh, G.; Xiao, Ping

doi:10.1016/j.jnucmat.2009.03.013

Cited by 64 publications

(42 citation statements)

References 49 publications

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“…Using high purity precursor chemicals ensure that the very low levels of impurities needed in a nuclear fission reactor is obtained. A fluidized-bed reactor (see Figure 2; taken from [35]) is used to grow symmetrical layers around the kernels. Symmetrical spherical particles are needed because asymmetrical ones have a higher probability of failure [36 -38].…”

Section: Coated Nuclear Fuel Particles (Triso Particles)mentioning

confidence: 99%

“…Symmetrical spherical particles are needed because asymmetrical ones have a higher probability of failure [36 -38]. The chemicals and deposition parameters are given in reference [32,34,35]. Examples of the characterization of the microstructure of the layers to determine whether the layers have the required properties are given in references [33, 34, 39 -45].…”

Section: Coated Nuclear Fuel Particles (Triso Particles)mentioning

confidence: 99%

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Diffusion of fission products and radiation damage in SiC

Malherbe

2013

J. Phys. D: Appl. Phys.

104

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A major problem with most of the present nuclear reactors is their safety in terms of the release of radioactivity into the environment during accidents. In some of the future nuclear reactor designs, i.e. Generation IV reactors, the fuel is in the form of coated spherical particles, i.e. TRISO (acronym for Triple Coated Isotropic) particles. The main function of these coating layers is to act as diffusion barriers for radioactive fission products, thereby keeping these fission products within the fuel particles, even under accident conditions. The most important coating layer is composed of polycrystalline 3C-SiC. This paper reviews the diffusion of the important fission products (silver, caesium, iodine and strontium) in SiC. Because radiation damage can induce and enhance diffusion, the paper also briefly reviews damage created by energetic neutrons and ions at elevated temperatures, i.e. the temperatures at which the modern reactors will operate, and the annealing of the damage. The interaction between SiC and some fission products (such as Pd and I) is also briefly discussed. As shown, one of the key advantages of SiC is its radiation hardness at elevated temperatures, i.e. SiC is not amorphized by neutron or bombardment at substrate temperatures above 350°C. Based on the diffusion coefficients of the fission products considered, the review shows that at the normal operating temperatures of these new reactors (i.e. less than 950°C) the SiC coating layer is a good diffusion barrier for these fission products. However, at higher temperatures the design of the coated particles needs to be adapted, possibly by adding a thin layer of ZrC.

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Section: Coated Nuclear Fuel Particles (Triso Particles)mentioning

confidence: 99%

Section: Coated Nuclear Fuel Particles (Triso Particles)mentioning

confidence: 99%

Diffusion of fission products and radiation damage in SiC

Malherbe

2013

J. Phys. D: Appl. Phys.

104

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“…The SiC layer in TRISO coated fuel particles is deposited from decomposition of MTS (methyltrichlorosilane) with hydrogen (H 2 ) at temperatures around 1200-1650°C [2,3]. Addition of argon (Ar) improves fluidization, compared to fluidizing solely with H 2 , and changes the SiC grain growth, typically reducing the SiC grain size and producing a more equiaxial grain structure as opposed to larger columnar grains.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of TRISO coated particles from the AGR-1 experiment: SiC grain size and grain boundary character

Kirchhofer

Hunn

Demkowicz

et al. 2013

Journal of Nuclear Materials

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“…Stoichiometric b-SiC can be obtained generally at temperatures between 1500 and 1600°C, with elementary carbon and silicon codeposited above and below this temperature range. Furthermore, the use of argon as diluent gas or propylene as a second reactive gas can permit the deposition of stoichiometric samples at temperatures of around 1400 and 1300°C, respectively [27]. Since stoichiometric SiC coatings are essential for the production of coated particle fuels, it is important to detect with good accuracy the presence of excess carbon or silicon.…”

Section: Stoichiometry Of Sicmentioning

confidence: 99%