Development of a nonequilibrium ECC mixing model for use in RELAP4/MOD7

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6111014

Fischer, S R ^[1]; Chow, H; Van Arsdall, G; Stadtke, H

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1. EG and G Idaho, Inc., Idaho Falls, ID

The nonequilibrium mixing model, which interfaces with the existing homogeneous equilibrium calculational scheme used in RELAP4, is described in detail. Preliminary comparisons between code calculations using the mixing model and experimental data are presented for Westinghouse Electric cold leg ECC injection tests, Battelle Columbus Laboratories and Creare ECC bypass tests, and LOFT and Semiscale tests. These code--data comparisons indicate the need for consideration of nonequilibrium effects in code simulations of the ECC bypass refill phase of postulated LOCA transients. In addition, these results point out the need for continued development of constitutive relations for use in modeling steam water mixing phenomena.

• Research Organization: Idaho National Engineering Lab., Idaho Falls (USA)
• Sponsoring Organization: Not Available; USDOE
• DOE Contract Number: EY-76-C-07-1570
• OSTI ID: 6111014
• Report Number(s): CONF-790423-1
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
COMPUTER CODES
ECCS
ENGINEERED SAFETY SYSTEMS
FLUID FLOW
FLUID MECHANICS
HYDRODYNAMICS
LOSS OF COOLANT
MATHEMATICAL MODELS
MECHANICS
MIXING
PWR TYPE REACTORS
R CODES
REACTOR ACCIDENTS
REACTOR PROTECTION SYSTEMS
REACTORS
TWO-PHASE FLOW
WATER COOLED REACTORS
WATER MODERATED REACTORS