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Effect of the waste exclusion distance on the postclosure performance of a reference disposal system

出版	Atomic Energy Of Canada Limited, 1995
URL	http://books.google.com.hk/books?id=tyNp0AEACAAJ&hl=&source=gbs_api

註釋Horizontal critical heat flux tests were conducted on a 37-element assembly with a heated length of 5.5 metres in the mr-3 freon heat transfer loop at crnl. the bundle cross section and radial heat flux profile represented bruce generating station fuel. the axial heat flux profile was uniform and a typical bundle junction was positioned 0.5 metres upstream of the downstream end of the heated length. test conditions covered water equivalent pressures from 1200 to 1585 psia, mass fluxes from 2 to 5 million lb/h.ft sup(2), and inlet subcoolings from 40 to 250 btu/lb. chf correlations have been fitted to the data. the initial critical heat flux condition was usually detected in the upper portion of the assembly, indicating the presence of a gravitational effect. however, the freon/water chf modelling techniques employed here were developed strictly for vertical test sections and have not been validated for horizontal test sections. downstream of the bundle junction chf was significantly higher than upstream, indicating a bundle junction effect. unfortunately, because the present string contained only one junction, no definite conclusion whether the junction depressed upstream chf or enhanced downstream chf can be drawn. however, an analysis of the test results suggests that the effect of the junction is to enhance downstream chf, so that additional junctions may have enhanced the chf performance of the string. further experiments are planned to test this postulation. a misalignment of 12 degrees at the bundle junction generally resulted in an increase in downstream chf at high coolant mass flux (5 x 10 sup(6) lb/hrft sup(2)) and a minimal effect at lower coolant flow rates.