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4.1 Blowdown Heat Transfer Single Tube Experiments and Their Interpretation

DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf.370
pages 595-608

D. Juhel
Commissariat a I'Energie Atomique, DTCE/STT-CEN. Grenoble, France

R. Ricque
Commissariat a I'Energie Atomique, DTCE/STT-CEN. Grenoble, France

I. Toth
Commissariat a I'Energie Atomique, DTCE/STT-CEN. Grenoble, France


The blowdown tests on the OMEGA, loop, at Grenoble, began in 1976 [1]. A new series of blowdown experiments was performed in 1978 in order to improve the understanding of the heat transfer phenomena during the blowdown phase of a loss of coolant accident. This experimental program is similar to the "separate effects" test programs carried out at ANL [2], EPRI [3] or ORNL [4].
The new series of experiments retained practically the geometry of the first one. The heated test section was a directly heated 3,66 m long tube internally cooled, the only difference being in wall thickness : it was reduced from 3 to 2 mm in order to reduce the response time of the thermocouples welded to the tube external surface. Much attention was paid to the instrumentation, especially what concerned flow rate and temperature measurements. Besides the applications of symetrical Venturis that allowed good measurement of reversed flow rates, special ball bearing turbine flow meters have been installed. An improved resolution for the wall temperature measurements allows to follow these temperature variations more exactly. Most of the experimental runs were conducted until the wall temperature reached 700°C.
After a short description of the experimental set-up and the instrumentation the pages presents typical experimental results for cold and hot leg breaches. Modelisation of the heat transfer processes encountered during the different phases of blowdown are discussed in the last chapters.

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