Three-dimensional analysis of thermal and fluid mixing in cold leg and downcomer of PWR geometries
Technical Report
·
OSTI ID:5257407
This report describes the three-dimensional transient and steady-state computations using the COMMIX-1A computer code for the analysis of six (6) 1/5-scale thermal and fluid mixing experiments conducted at Creare, Inc. under EPRI sponsorship. The tests chosen for analyses emphasized the effects of vent valve flow, cold leg and high pressure injection (HPI) coolant flow rates, and HPI location and geometry. The COMMIX-1A computations will provide fluid temperatures and velocities in the belt-line region of the downcomer for assessment of boundary conditions for thermal stress analysis in the vessel walls. A realistic prediction for thermal and fluid mixing significantly helps establish what overcooling transients can lead to in pressurized thermal shock (PTS) events. Sample three-dimensional steady-state computations are presented for three (3) generic full-scale pressurized water reactors (PWR's) typical of Westinghouse (W), Combustion Engineering (CE), and Babcock and Wilcox (B and W) configurations as part of the code assessment.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5257407
- Report Number(s):
- EPRI-NP-3321; ON: DE84005143
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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REACTOR SAFETY
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COMPUTER CALCULATIONS
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FLUID MECHANICS
HEAT TRANSFER
HPCI
HYDRAULICS
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PRIMARY COOLANT CIRCUITS
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR PROTECTION SYSTEMS
REACTOR SAFETY
REACTORS
SAFETY
STRUCTURAL MODELS
TEMPERATURE GRADIENTS
THERMAL SHOCK
THREE-DIMENSIONAL CALCULATIONS
TRANSIENTS
WATER COOLED REACTORS
WATER MODERATED REACTORS