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

Title: Analytical model for bottom reflooding heat transfer in light water reactors (the UCFLOOD code)

Abstract

The UCFLOOD code is based on mechanistic models developed to analyze bottom reflooding of a single flow channel and its associated fuel rod, or a tubular test section with internal flow. From the hydrodynamic point of view the flow channel is divided into a single-phase liquid region, a continuous-liquid two-phase region, and a dispersed-liquid region. The void fraction is obtained from drift flux models. For heat transfer calculations, the channel is divided into regions of single-phase-liquid heat transfer, nucleate boiling and forced-convection vaporization, inverted-annular film boiling, and dispersed-flow film boiling. The heat transfer coefficients are functions of the local flow conditions. Good agreement of calculated and experimental results has been obtained. A code user's manual is appended.

Authors:
;
Publication Date:
Research Org.:
California Univ., Berkeley (USA)
OSTI Identifier:
6558445
Report Number(s):
EPRI-NP-756
TRN: 79-002023
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; FUEL CHANNELS; LOSS OF COOLANT; COMPUTER CODES; U CODES; HYDRODYNAMICS; HEAT TRANSFER; HYDRAULICS; PWR TYPE REACTORS; ECCS; FLOW RATE; TEMPERATURE DISTRIBUTION; ACCIDENTS; ENERGY TRANSFER; ENGINEERED SAFETY SYSTEMS; FLUID MECHANICS; MECHANICS; REACTOR ACCIDENTS; REACTOR CHANNELS; REACTOR COMPONENTS; REACTOR PROTECTION SYSTEMS; REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210100 - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled

Citation Formats

Arrieta, L., and Yadigaroglu, G. Analytical model for bottom reflooding heat transfer in light water reactors (the UCFLOOD code). United States: N. p., 1978. Web.
Arrieta, L., & Yadigaroglu, G. Analytical model for bottom reflooding heat transfer in light water reactors (the UCFLOOD code). United States.
Arrieta, L., and Yadigaroglu, G. Tue . "Analytical model for bottom reflooding heat transfer in light water reactors (the UCFLOOD code)". United States.
@article{osti_6558445,
title = {Analytical model for bottom reflooding heat transfer in light water reactors (the UCFLOOD code)},
author = {Arrieta, L. and Yadigaroglu, G.},
abstractNote = {The UCFLOOD code is based on mechanistic models developed to analyze bottom reflooding of a single flow channel and its associated fuel rod, or a tubular test section with internal flow. From the hydrodynamic point of view the flow channel is divided into a single-phase liquid region, a continuous-liquid two-phase region, and a dispersed-liquid region. The void fraction is obtained from drift flux models. For heat transfer calculations, the channel is divided into regions of single-phase-liquid heat transfer, nucleate boiling and forced-convection vaporization, inverted-annular film boiling, and dispersed-flow film boiling. The heat transfer coefficients are functions of the local flow conditions. Good agreement of calculated and experimental results has been obtained. A code user's manual is appended.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {8}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: