Thermal-hydraulic Assessment of Seven Wire-wrapped rod Bundle

Kefeng Lyu,Xudan Ma,Xuelei Sheng,N Sheshko,U Navaseltsau

doi:10.1051/e3sconf/202021201009

Abstract

Lead bismuth eutectic (LBE) is one of the most potential materials for coolant and spallation target for Accelerator Driven Systems (ADS). Thermal-hydraulic behavior of LBE in fuel assembly is a key issue for development of the systems. To get a deeper understanding on the complex thermal-hydraulic features of wire-wrapped rod bundle cooled by upward LBE, an electrically bundle with 7 rods wrapped with helical wire was developed in KYLIN-II thermal-hydraulic forced circulation loop. The flow resistance, thermal entrance characteristic and heat transfer coefficient were investigated. As for the entrance characteristics, during the full heating length (exceeding 140 times the hydraulic diameter), the thermal field did not reach a fully developed and stable condition which is contrary to the ducted flows. The experimental heat transfer coefficient showed that the hexagonal shell has a great influence on the heat transfer coefficient in rod bundle geometry. For this reason the application of empirical correlation should be kept cautious in rod bundle analysis.

Highlights

Accelerator Driven sub-critical Systems (ADS) are considered as one of the most potential options to incinerate long living fission products by transmutation
In 2011, the Accelerator Driven Systems (ADS) project was launched in China by Chinese Academy of Sciences (CAS), and a 10MWth experimental reactor cooled by Lead bismuth eutectic (LBE) named CLEAR-I
In the frame of this project, to support the design and construction of CLEAR-I, KYLIN-II multi-functional LBE facility, including material, thermal-hydraulic and safety loops has been established based on the former experience on lead-lithium experimental technology

Summary

Introduction

Accelerator Driven sub-critical Systems (ADS) are considered as one of the most potential options to incinerate long living fission products by transmutation 2013) were conducted to study the thermal-hydraulic characteristics of heavy liquid metal in rod bundle. The rod bundle geometries have a lot of influencing factors, e.g. pitch to diameter, wire pitch, hexagonal shell and so on, only several experiments could not summarize the complex flow and heat transfer features.

Results

Conclusion