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

Title: Numerical study of hot-leg ECC injection into the upper plenum of a pressurized water reactor

Abstract

In certain pressurized water reactor (PWR) designs, emergency core coolant (ECC) is injected through the hot legs into the upper plenum. The condensation of steam on this subcooled liquid stream reduces the pressure in the hot legs and upper plenum and thereby affects flow conditions throughout the reactor. In the present study, we examine countercurrent steam-water flow in the hot leg to determine the deceleration of the ECC flow that results from an adverse pressure gradient and from momentum exchange from the steam by interfacial drag and condensation. For the parameters examined in the study, water flow reversal is observed for a pressure drop of 22 to 32 mBar over the 1.5 m hot leg. We have also performed a three-dimensional study of subcooled water injection into air and steam environments of the upper plenum. The ECC water is deflected by an array of cylindrical guide tubes in its passage through the upper plenum. Comparisons of the air-water results with data obtained in a full scale experiment shows reasonable agreement, but indicates that there may be too much resistance to horizontal flow about the columns because of the use of a stair-step representation of the cylindrical guide tube cross section.more » Calculations of flow past single columns of stair-step, square and circular cross section do indicate excessive water deeentrainment by the noncircular column. This has prompted the use of an arbitrary mesh computational procedure to more accuratey represent the circular cross-section guide tubes. 15 figures.« less

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA); Flow Science, Inc., Los Alamos, NM (USA)
OSTI Identifier:
6634200
Report Number(s):
LA-UR-81-875; CONF-810307-2
TRN: 81-007358
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 3. specialist meeting on transient two-phase flow, Pasadena, CA, USA, 23 Mar 1981
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ECCS; PERFORMANCE; PWR TYPE REACTORS; COMPUTER CALCULATIONS; FLOW RATE; FLUID FLOW; FLUID INJECTION; PRESSURE DROP; STEAM; THREE-DIMENSIONAL CALCULATIONS; WATER; ENGINEERED SAFETY SYSTEMS; HYDROGEN COMPOUNDS; OXYGEN COMPOUNDS; REACTOR PROTECTION SYSTEMS; REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled

Citation Formats

Daly, B J, Torrey, M D, and Rivard, W C. Numerical study of hot-leg ECC injection into the upper plenum of a pressurized water reactor. United States: N. p., 1981. Web.
Daly, B J, Torrey, M D, & Rivard, W C. Numerical study of hot-leg ECC injection into the upper plenum of a pressurized water reactor. United States.
Daly, B J, Torrey, M D, and Rivard, W C. Thu . "Numerical study of hot-leg ECC injection into the upper plenum of a pressurized water reactor". United States. https://www.osti.gov/servlets/purl/6634200.
@article{osti_6634200,
title = {Numerical study of hot-leg ECC injection into the upper plenum of a pressurized water reactor},
author = {Daly, B J and Torrey, M D and Rivard, W C},
abstractNote = {In certain pressurized water reactor (PWR) designs, emergency core coolant (ECC) is injected through the hot legs into the upper plenum. The condensation of steam on this subcooled liquid stream reduces the pressure in the hot legs and upper plenum and thereby affects flow conditions throughout the reactor. In the present study, we examine countercurrent steam-water flow in the hot leg to determine the deceleration of the ECC flow that results from an adverse pressure gradient and from momentum exchange from the steam by interfacial drag and condensation. For the parameters examined in the study, water flow reversal is observed for a pressure drop of 22 to 32 mBar over the 1.5 m hot leg. We have also performed a three-dimensional study of subcooled water injection into air and steam environments of the upper plenum. The ECC water is deflected by an array of cylindrical guide tubes in its passage through the upper plenum. Comparisons of the air-water results with data obtained in a full scale experiment shows reasonable agreement, but indicates that there may be too much resistance to horizontal flow about the columns because of the use of a stair-step representation of the cylindrical guide tube cross section. Calculations of flow past single columns of stair-step, square and circular cross section do indicate excessive water deeentrainment by the noncircular column. This has prompted the use of an arbitrary mesh computational procedure to more accuratey represent the circular cross-section guide tubes. 15 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

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: