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

Hui CHEN; Wenjie ZENG; Dongnan ZHANG; Tao YU

doi:10.11889/j.0253-3219.2017.hjs.40.050602

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

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Analysis of jet device transient feature during start-up period of primary pump
- NUCLEAR TECHNIQUES Vol. 40, Issue 5, Article number: 050602(2017)
- 作者机构：
  
  南华大学核科学技术学院衡阳 421001
- 作者简介：
- 基金信息：
  
  Supported by Foundation of Laboratory of Nuclear Reactor System Design and Technology
- DOI：10.11889/j.0253-3219.2017.hjs.40.050602
  CLC： TL333
- Received：09 January 2017，
  
  Revised：21 February 2017，
  
  Published：10 May 2017
- 稿件说明：
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Hui CHEN, Wenjie ZENG, Dongnan ZHANG, et al. Analysis of jet device transient feature during start-up period of primary pump[J]. Nuclear techniques, 2017, 40(5): 050602
DOI：

Hui CHEN, Wenjie ZENG, Dongnan ZHANG, et al. Analysis of jet device transient feature during start-up period of primary pump[J]. Nuclear techniques, 2017, 40(5): 050602 DOI： 10.11889/j.0253-3219.2017.hjs.40.050602.

摘要

射流装置由射流泵和主泵组成，引入MRX（Marine Reactor X）压水堆一回路系统中，有助于提升反应堆的固有安全性。反应堆启泵过程中，流量急剧上升导致堆芯温度变化，影响堆芯运行安全。通过计算流体力学（Computational Fluid Dynamics，CFD）方法对引入射流装置MRX一回路10%满功率（Full Power，FP）、17.5% FP和25% FP堆芯功率下启泵进行三维瞬态模拟，分析MRX一回路中射流装置流场瞬态特性。结果表明，射流装置的加入可以改善一回路自然循环能力，提高启泵工况下冷却剂初始变化流量，减缓变化趋势，改善过渡安全性；启泵过程中一回路温度存在波动现象，且堆芯功率越大，波动幅度越大，时间越长；启泵完成后射流泵喷嘴处流速较大。验证了压水堆中引入射流装置提升反应堆固有安全性的可行性，同时为进一步优化设计方案提供方向参考。

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.

关键词

Keywords

references

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