Effect of FLiBe Infiltration Pressure on Microstructure of Matrix for TMSR Fuel Elements (FEs)

Abstract:

The matrix graphite of fuel elements (FEs) with infiltration of 2LiF-BeF₂(FLiBe) at different pressures varying from 0.4 MPa to 1.0 MPa, has been studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and positron annihilation lifetime (PAL) measurement. The result of XRD reveals that diffraction patterns of FLiBe appear in matrix graphite infiltrated with FLiBe at a pressure of 0.8 MPa and 1.0 MPa. The surface morphology from SEM shows that FLiBe mainly distributes within macro-pores of matrix graphite. PAL measurement indicates that there are mainly two positron lifetime components in all specimens:τ₁~0.21 ns and τ_{2 ­}~0.47 ns, ascribed to annihilation of positrons in bulk and trapped-positrons at surface, respectively. The average positron lifetime decreases with infiltration pressure, due to the decrease in annihilation fraction of positrons with surface after infiltration of FLiBe into macro-pores.

• Periodical: Defect and Diffusion Forum (Volume 373)
• Pages: 189-192
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.373.189
• Online since: March 2017
• Authors: Hong Xia Xu, Jun Lin*, Yu Chen, Bing Chuan Gu, Bang Jiao Ye, Zhi Yong Zhu, Hai Tao Jiang, Ya Juan Zhong, Bing Liu
• Keywords: FLiBe, Infiltration, Matrix, Positron, TMSR

References

[1] A technology roadmap for Generation IV nuclear Energy systems, USDOE/GIG-002-00 report, The U.S. DOE nuclear research advisory committee and Generation IV International forum, 11, 33 (2002).

DOI: 10.2172/859029

[2] M.H. Jiang, H.J. Xu, et al. Advanced fission energy program-TMSR nuclear energy system. Bull Chin. Acad. Sci., 27(2012) 366.

[3] Advances in high temperature gas cooled reactor fuel technology. IAEA-TECDOC-1674, Vienna, Austria, (2012).

[4] R.C. Robertson, MSRE design and operation report PART I: Description of reactor design, ORNL-TM-728, U.S. Atomic energy Commission, (1965).

DOI: 10.2172/4654707

[5] C.H. Tang, Y.P. Tang, et al., Design and manufacture of the fuel element for the 10MW high temperature gas-cooled reactor. Nucl. Eng. Design 218 (2002) 91–102.

DOI: 10.1016/s0029-5493(02)00201-7

[6] K. G. Lynn, J R MacDonald, R.A. Boie, et al. Phys. Rev. Lett. 38 (1977) 241-244.

[7] P. Asoka-Kumar, M. Alatalo, V. J. Ghosh, et al. Phys. Rev. Lett. 77 (1996) 2097-2100.

[8] Y. Nagai, M. Hasegawa, Z. Tang, et al. Phys. Rev. B. 61 (2000) 6574-78.

[9] T. Iwata, H. Fukushima, M. Shimotomai, et al., Jpn. J. Appl. Phys., 20 (1981) 1799-1806.

[10] Y.C. Jean, K. Venkateswaran, E. Parsais et al., Appl. Phys. A 35 (1984) 169-176.

[11] Z. Tang, M. Hasagawa et al. Phys. Rev. Lett., (1999) 2532-2535.

[12] T. Tanabe, K. Niwase, N. Tsukuda, et al. J. Nucl. Mater. (1992) 191–194; 330–4.

[13] S.F. Bartram, E.F. Kaelble, Handbook of X-rays for diffraction, emission, absorption, and microscopy, New York, 1967, p.17. 1–17. 18.

[14] A. Bisi, A. Fiorentini and L. Zappa, Phys. Rev. 134A (1964) 328.

[15] K.P. Singh and R.M. Singru, Chem. Phys. Lett. 10 (1971) 328-330.