skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System

Abstract

When the POSRV equipped in a nuclear power plant opens in instant by a failure in coolant system of PWR, a moving shock wave generates, and propagates downstream of the valve, inducing a complicated unsteadiness. The moving shock wave may exert severe load to the structure. In this connection, a method of gradual opening of the valve is used to reduce the load acting on the wall at the downstream of the POSRV. In the present study, experiments and calculations are performed to investigate the detail unsteady flow at the various pipe units and the effect of valve opening time on the flow downstream of the valve. In calculation by using of air as working fluid, 2-dimensional, unsteady compressible Navier-Stokes equations are solved by finite volume method. It was found that when the incident shock wave passes through the pipe unit, it may experience diffraction, reflection and interaction with a vortex. Furthermore, the geometry of the pipe unit affects the reflection type of shock wave and changes the load acting on the wall of pipe unit. It was also turned out that the maximum force acting on the wall of the pipe unit becomes in order of T-junction, 108 deg.more » elbow and branch in magnitude, respectively. And, the results obtained that show that the rapid pressure rise due to the moving shock wave by instant POSRV valve opening is attenuated by employing the gradual opening. (authors)« less

Authors:
;  [1]; ; ;  [2]
  1. Department of Mechanical Engineering, Kyungpook National University, 1370, Sankyuk-dong, Daegu 702-701 (Korea, Republic of)
  2. Korea Institute of Nuclear Safety, 19, Kusungdong, Yousungku, Daejon 305-338 (Korea, Republic of)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
21160772
Resource Type:
Conference
Resource Relation:
Conference: ICAPP'04: 2004 international congress on advances in nuclear power plants, Pittsburgh, PA (United States), 13-17 Jun 2004; Other Information: Country of input: France; 9 refs; Related Information: In: Proceedings of the 2004 international congress on advances in nuclear power plants - ICAPP'04, 2338 pages.
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; COOLING SYSTEMS; DIFFRACTION; FAILURES; NAVIER-STOKES EQUATIONS; NUCLEAR POWER PLANTS; PWR TYPE REACTORS; REFLECTION; RELIEF VALVES; SHOCK WAVES; TWO-DIMENSIONAL CALCULATIONS; UNSTEADY FLOW; WALLS; WORKING FLUIDS

Citation Formats

Kwon, Soon-Bum, Lee, Dong-Won, Kim, In-Goo, Ahn, Hyung-Joon, and Kim, Hho-Jung. Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System. United States: N. p., 2004. Web.
Kwon, Soon-Bum, Lee, Dong-Won, Kim, In-Goo, Ahn, Hyung-Joon, & Kim, Hho-Jung. Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System. United States.
Kwon, Soon-Bum, Lee, Dong-Won, Kim, In-Goo, Ahn, Hyung-Joon, and Kim, Hho-Jung. 2004. "Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System". United States.
@article{osti_21160772,
title = {Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System},
author = {Kwon, Soon-Bum and Lee, Dong-Won and Kim, In-Goo and Ahn, Hyung-Joon and Kim, Hho-Jung},
abstractNote = {When the POSRV equipped in a nuclear power plant opens in instant by a failure in coolant system of PWR, a moving shock wave generates, and propagates downstream of the valve, inducing a complicated unsteadiness. The moving shock wave may exert severe load to the structure. In this connection, a method of gradual opening of the valve is used to reduce the load acting on the wall at the downstream of the POSRV. In the present study, experiments and calculations are performed to investigate the detail unsteady flow at the various pipe units and the effect of valve opening time on the flow downstream of the valve. In calculation by using of air as working fluid, 2-dimensional, unsteady compressible Navier-Stokes equations are solved by finite volume method. It was found that when the incident shock wave passes through the pipe unit, it may experience diffraction, reflection and interaction with a vortex. Furthermore, the geometry of the pipe unit affects the reflection type of shock wave and changes the load acting on the wall of pipe unit. It was also turned out that the maximum force acting on the wall of the pipe unit becomes in order of T-junction, 108 deg. elbow and branch in magnitude, respectively. And, the results obtained that show that the rapid pressure rise due to the moving shock wave by instant POSRV valve opening is attenuated by employing the gradual opening. (authors)},
doi = {},
url = {https://www.osti.gov/biblio/21160772}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 2004},
month = {Thu Jul 01 00:00:00 EDT 2004}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: