Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (4): 40007-040007.doi: 10.11889/j.0253-3219.2020.hjs.43.040007

• SPECIAL SECTION ON THE 11TH NATIONAL CONFERENCE ON NEW AND RESEARCH REACTORS (PART I) • Previous Articles     Next Articles

Validation of the discharge force analysis method and key influence factors study

Dan WU1,2,Jie WANG1,2,Sijia DU1,2(),Hongyu FANG1,2,Na YU1,2   

  1. 1.Nuclear Power Institute of China,Chengdu 610041, China
    2.Science and Technology on Reactor System Design Technology Laboratory,Chengdu 610041, China
  • Received:2020-02-15 Revised:2020-03-30 Online:2020-04-15 Published:2020-04-20
  • Contact: Sijia DU E-mail:dusj02@163.com
  • About author:WU Dan, female, born in 1986, graduated from Tsinghua University with a doctoral degree in 2013, focusing on thermal hydraulic and safety analysis
  • Supported by:
    Complex Behavior and Safety Characteristics of New Fuel Element under LOCA Condition(U1867219)

Abstract: Background

Pilot operated safety valve is widely used in the design of generation-III nuclear power plant (NPP) to provide overpressure protection function. Compared with safety valves used in generation-II nuclear power plant, pilot operated safety valve has much shorter opening time, hence generates great discharge force. Discharge force analysis is crucial to the design of pressurizer discharge pipe of the 3rd generation advanced nuclear power plant. As a necessary input for stress analysis, discharge force is important for evaluating whether the pipe design and pipe support design is reasonable.

Purpose

This study aims to develop and validate a set of dischage force analysis method for 3rd generation NPP.

Methods

Based on the previous study of basic discharge force analysis method where the RELAP5 was used to model the thermal-hydraulic process and the force results deduced through post-processing,further validation of the proposed discharge force analysis method was processed by simulating the EPRI PWR Safety and Relief Valve Test in this study. Key influencing factors, such as valve opening time, seal temperature, seal volume, et al, were investigated to give useful suggestions for design.

Results

It is found that valve opening time, seal temperature, and seal volume has a great influence on the calculation results, and the law of influence is very complicated.

Conclusions

It is proved that the RELAP5 code could be used to model the complex discharge process, and the method developed can be applied to engineering practice.

Key words: Discharge force, Valve opening time, Seal temperature, Seal volume

CLC Number: 

  • TL99