Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (5): 50602-050602.doi: 10.11889/j.0253-3219.2017.hjs.40.050602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Analysis of jet device transient feature during start-up period of primary pump

CHEN Hui, ZENG Wenjie, ZHANG Dongnan, YU Tao   

  1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • Received:2017-01-09 Revised:2017-02-21 Online:2017-05-10 Published:2017-05-03
  • About author:10.11889/j.0253-3219.2017.hjs.40.050602
  • Supported by:

    Supported by Foundation of Laboratory of Nuclear Reactor System Design and Technology (No.2015SYS02)

Abstract:

Background: The jet device composed of jet pump and primary pump has the advantages of simple structure and high reliability, and it is suitable for the special environment, such as radioactive, flammable and explosive. It is helpful to improve the inherent safety of the reactor by introducing the jet device as primary pump for Marine Reactor X (MRX). The sudden increase of the coolant flow rate of the reactor leads to the change of the core temperature during start-up period, which affects the safety of the core operation. Purpose:This study aims to obtain the jet device transient feature during start-up period of primary pump in the MRX which introducing the jet device as primary pump. Methods: The primary loop circuit system is modeled with a 3-dimensional (3D) Computational Fluid Dynamics (CFD) code FLUENT, and transient characteristics at 10% full power (FP), 17.5% FP and 25% FP core power conditions were analyzed during the stage of primary pump startup. Results: The analysis results show that the jet device can effectively improve the natural circulation ability of the primary loop circuit system, reform the initial flow rate and slow down the trend of coolant temperature change during start-up period of primary pump, so it can improve the safety of the transition. On the other hand, there are some unfavorable factors of reactor safety during start-up period of primary pump, such as the temperature of the primary circuit fluctuates (the greater the core power, the greater the fluctuation range) and the high flow rate of jet pump. Conclusion: The design of jet device is feasible to improve the safety of MRX, but the real use also needs some adjustment.

Key words: Jet device, Start-up period of primary pump, CFD, 3D flow field

CLC Number: 

  • TL333