DocumentCode :
300936
Title :
Time-to-burnout data for a prototypical ITER divertor tube during a simulated loss of flow accident
Author :
Marshall, T.D. ; Watson, R.D. ; McDonald, J.M. ; Wold, L.S. ; Youchison, D.L. ; Cadwallader, L.C.
Author_Institution :
Rensselaer Polytech. Inst., Troy, NY, USA
Volume :
1
fYear :
1995
fDate :
30 Sep-5 Oct 1995
Firstpage :
228
Abstract :
The Loss of Flow Accident (LOFA) is a serious safety concern for the International Thermonuclear Experimental Reactor (ITER) as it has been suggested that greater than 100 seconds are necessary to safely shutdown the plasma when ITER is operating at full power. In this experiment, the thermal response of a prototypical ITER divertor tube during a simulated LOFA was studied. The divertor tube was fabricated from oxygen-free high-conductivity copper to have a square geometry with a circular coolant channel. The coolant channel inner diameter was 0.77 cm, the heated length was 4.0 cm, and the heated width was 1.6 cm. The mockup did not feature any flow enhancement techniques, i.e., swirl tape, helical coils, or internal fins. One-sided surface heating of the mockup was accomplished through the use of the 30 kW Sandia Electron Beam Test System. Alter reaching steady state temperatures in the mockup, as determined by two Type-K thermocouples installed 0.5 mm beneath the heated surface, the coolant pump was manually tripped off and the coolant flow allowed to naturally coast down. Electron beam heating continued after the pump trip until the divertor tube´s heated surface exhibited the high temperature transient normally indicative of rapidly approaching “burnout”. Experimental data showed that time-to-burnout increases proportionally with increasing inlet velocity and decreases proportionally with increasing incident heat flux
Keywords :
fusion reactor materials; fusion reactor safety; 30 kW Sandia Electron Beam Test System; Cu; ITER divertor tube; International Thermonuclear Experimental Reactor; Type-K thermocouples; circular coolant channel; coast down; coolant pump; high temperature transient; incident heat flux; inlet velocity; oxygen-free high-conductivity copper; plasma shutdown; safety; simulated LOFA; simulated loss of flow accident; square geometry; steady state temperatures; thermal response; time-to-burnout data; Accidents; Coolants; Electron beams; Heat pumps; Inductors; Plasma simulation; Plasma temperature; Prototypes; Safety; Virtual prototyping;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Fusion Engineering, 1995. SOFE '95. Seeking a New Energy Era., 16th IEEE/NPSS Symposium
Conference_Location :
Champaign, IL
Print_ISBN :
0-7803-2969-4
Type :
conf
DOI :
10.1109/FUSION.1995.534209
Filename :
534209
Link To Document :
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