Results and analysis of the INEL once through steam generator air-water and steam-water experiments
Experiments have been conducted in steam/air facilities that model BandW Once Through Steam Generator (OTSG) heat transfer and fluid flow behavior during auxiliary feedwater (AFW) injection. The experiments and analysis described in this paper examine the basic phenomena of AFW radial and axial flow distribution, tube support plate (TSP) flooding, and tube heat transfer. Flow distribution is studied visually and measured in an unheated multi-tube (625 tubes) full scale 1/8 sector of the OTSG that includes three TSP's. Heat transfer is examined in a heated single tube facility with either one or two broached hole support plates and either air or steam upflow. The flow distribution experiments indicate that radial, axial, and azimuthal spreading is a strong function of AFW flow rate and a weaker function of vapor upflow although liquid spreading becomes an increasingly stronger function of vapor upflow as the flooding line is approached. A semi-empirical model of AFW penetration without gas flow is presented. The model is extended to include the influence of gas flow by correlation. The heat transfer experiments indicate that heat transfer is highly dependent on AFW injection rate, and in particular on whether or not the water flows down the tubes as a continuous film or breaks into rivulets. A computer model of heat transfer has been developed, and is described. The data gathered during the experiments and the models developed from this data are currently being incorporated into the RELAP5 computer code. 20 refs., 16 figs.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls (USA)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 6535008
- Report Number(s):
- EGG-M-88326; CONF-8810155-31; ON: DE89005138
- Resource Relation:
- Conference: 16. water reactor safety information meeting, Gaithersburg, MD, USA, 24 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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