Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (3): 30603-030603.doi: 10.11889/j.0253-3219.2020.hjs.43.030603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Thermal fragmentation study on interaction of melton Pb-Sn alloy and coolant

Ge TONG Lili LI   

  1. School of Mechanical and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2019-11-07 Revised:2020-01-06 Online:2020-03-15 Published:2020-03-24
  • Supported by:
    National Natural Science Foundation of China(U1967202)

Abstract: Background

Fuel coolant interaction (FCI) is one of the possible serious problems in severe accidents of nuclear power plants.

Purpose

This study aims to further understand FCI phenomenon and key factors affecting the process of thermal fine fragmentation.

Methods

Visualized experiments were performed using Pb-Sn alloy. Images of the reaction process were acquired through a high-speed video system, the area of pixels occupied by the molten materials was calculated to obtain the cross-sectional area of interaction zone. Melt debris was collected to investigate, the effects of initial melt temperature, melt mass and coolant temperature from three aspects: the morphology of experimental products, the state of interaction process and the gas distribution around molten materials.

Results & Conclusions

The comparative analysis results show that with the increase of melt temperature, thermal fine fragmentation is enhanced first and then reduced. With fixed water volume, improving the quality of the molten materials may lead to insufficient thermal fragmentation. High sub-cooling temperature is beneficial to thermal fine fragmentation of molten materials in FCI process.

Key words: FCI, Thermal fragmentation, Severe accident

CLC Number: 

  • TL364+.4