Measurement of countercurrent phase separation and distribution in a two-dimensional test section
The degree of phase separation that occurs in the core of a pressurized water reactor (PWR) during various postulated accidents is an important consideration for studying the course of events during such accidents. The dependence of countercurrent phase separation and distribution phenomena on flow quality, mass flux and system geometry was studied experimentally in a two-dimensional (2-D) test section. A two-phase (air/water) mixture flowed upwards and single-phase water flowed downward along one side of the test section. This countercurrent flow configuration was intended to simulate the so-called chimney effect in the diabatic JAERI 2-D experiments in Japan. A large air/water loop used with a 91.44 cm x 91.44 cm x 1.27 cm test section to study phase separation and distribution effects. A traversing single beam gamma-densitometer was used to measure the chordal average void fractions at several elevations along the test section. Cross-plots between various flow conditions and geometries were made. An error analysis giving the total error in the void fraction measurements was also performed. High speed photographs were also made of the flow structure, to provide information on flow regimes. The photographic records and the void fraction and hydraulic inflow/outflow data are presented in a form suitable for the assessment of advanced generation computer codes (e.g., TRAC).
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Nuclear Engineering
- OSTI ID:
- 5444667
- Report Number(s):
- NUREG/CR-3577; ON: DE84900662
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
AIR
COOLANT LOOPS
COOLING SYSTEMS
COUNTER CURRENT
ENERGY SYSTEMS
FLUID FLOW
FLUIDS
GASES
HYDROGEN COMPOUNDS
LOSS OF COOLANT
OXYGEN COMPOUNDS
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTORS
SIMULATION
TWO-PHASE FLOW
VOID FRACTION
WATER
WATER COOLED REACTORS
WATER MODERATED REACTORS