Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (3): 30603-030603.doi: 10.11889/j.0253-3219.2019.hjs.42.030603

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Study on compatibility between U-Zr alloy fuel with lead, bismuth alloy

Xiang ZHANG,Xiaoqiang PAN(),Chaohong LIU,Jing YANG,Qiang ZENG   

  1. 1. National Key Laboratory for Reactor Fuel and Materials, Nuclear Power Institute of China, Chengdu 610213, China
  • Received:2018-07-20 Revised:2018-12-03 Online:2019-03-10 Published:2019-03-14
  • Contact: Xiaoqiang PAN E-mail:sivpxq@163.com
  • About author:<named-content content-type="corresp-name">ZHANG Xiang</named-content>, male, born in 1990, graduated from Central South University with a master's degree in 2016, focusing on nuclear fuels and materials|<named-content content-type="corresp-name">ZHANG Xiang</named-content>, male, born in 1990, graduated from Central South University with a master's degree in 2016, focusing on nuclear fuels and materials|PAN Xiaoqiang, E-mail:<email>sivpxq@163.com</email>

Abstract: Background

Lead-bismuth is the advanced reactor coolant. The corrosion compatibility between U-Zr alloy fuel and liquid lead-bismuth eutectic alloy (LBE) is the important basis for fuel verification and design of LBE cooled reactor.

Purpose

This study aims at the corrosion mechanism and compatibility of U-Zr alloy and liquid lead-bismuth eutectic alloy.

Methods

Experimental temperature was set at 600 oC and heat preserved for 1 000 h, the corrosion compatibility and interfacial reaction of U-Zr alloy fuel with liquid lead (bismuth) alloy were investigated by both the scanning electron microscope (SEM) and the X-ray diffraction (XRD).

Results

The results show U-Zr alloy was eroded more or less after long-term interaction with bismuth, lead, LBE, lead-tin and lead-tin. The order of erosion degree is as Bi>Pb-Bi>Pb-Bi-Sn>Pb≈Pb-Sn. The depth of U-Zr alloy eroded by liquid coolant reached the millimeter level.

Conclusions

The corrosion mechanism of U-Zr alloy is a comprehensive process of dissolution and eutectic formation of intermetallic compounds. Intermetallic compounds UPb3 and UBi2,can be formed by the interaction of uranium with lead and bismuth, respectively. The degree of U-Zr alloy erosion depends on the solubility and the eutectic reaction rate of U, Zr in the coolant.

Key words: U-Zr alloy fuel, Lead-bismuth eutectic alloy, Compatibility, Diffusion couple, Corrosion mechanism

CLC Number: 

  • TL343