Abstract




 
   

Vol. 9, No. 2 (May 1996) 45-52   

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  THERMAL -HIDRAOLYC STUDY OF TRR CORE IN FUEL CONVERSION FROME HIGHLY ENRICHED URANIUM TO LOW ENRICHED URANIUM FUEL (RESEARCH NOTES)
 
 
A. Pazirandeh and M. A. Shirazi
 
Physics Department
University of Tehran
Tehran, Iran
 
 
 
 

Abstract    The Atomic Energy Organization of Iran (AEOI) planned to refuel the HEU fueled core by LEU fuel in 1992*. In the fuel conversion, neutronics analysis and kinetic study for HEU and LEU cores have been carried out in order to be able to adjust LEU core parameters with those of HEU. In the thermal-hydraulic study of the LEU core, the diversity of combinations of number of plate/SFE (standard fuel element), fuel-loading/SFE and water channel gap were considered. In the calculational study, temperature distribution of clad surface along the hottest channel was determined and T(ONB), T(Sat), CHF (critical heat flux), and DNBR (departure from uncleate boiling) were calculated. No major technical problem is encountered in the fuel conversion. MDNBR was calculated in the hottest channel to be about 3.55 in normal operation with fuel loading varying between 225-300 g U-235/SFE.

 

Keywords    Thermal-hydraulic, Fuel-conversion, HEU/LEU Fuel, MDNBR, COBRA- 3C, UČ3O8-Al Fuel, Flux Ratio, T(ONB), Rectangular Channel, Downward Forced Convection, Subchannel.

 

References   

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3. Rowe D. S., "COBRA-3C Analytical Computer Program for Steady and Transient Thermal-Hydraulic Analysis Rod Bundle Fuel Element BNWL-1695", Bettele-Northwest, Richland, WA, (March. 1973).

4. Collier J.G., "Convective Boiling and Condensation", McGraw-Hill (1972).

5. Forti G. and Vincenti E., "The Codes COSTANZA for the Dynamics of Liquid-cooled Nuclear Reactors". EUR-3633e, (1967).

6. Sudo Y., Ando H., Ikawa H. and Ohishi N., "Core Thermohydraulic Design with 20% LEU Fuel for Upgraded Research Reactor JRR-2", J. Nuc. Sci. & Tech. 22 (7) (July 1985) (551-564.

7. Incropera F.P. and DeWitt D.P., "Introduction to Heat Transfer" John-Wiley & Sons, (1985).

8. Chapman A.J., "Heat Transfer", Second edition, The McGraw-Hill Book Company, (1967).






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