FABRICATION, QUALITY CONTROL AND THERMAL FATIGUE TESTING OF A TYPE FIRST WALL
Among the various concepts proposed for the first wall (F.W.) of an Experimental Fusion Reactor, such as NET/INTOR, a continuous shell cooled by an array of cooling ducts presents some advantages, as pointed out in other papers at this Conference. To check the industrial feasibility and the adequacy of this design to the operating conditions of the INTOR/NET F. W., it was started an experimental programme dealing with the various aspects of fabrication, quality control and testing of a reduced scale model. The model consists of a plate, dimensions 250x200x14 mm, made out of 316 stainless steel. Cooling pipes of the same material, 6 mm O.D. and 4 mm I.D., are brazed with a NICO-BRAZE alloy to grooves machined on one surface of the plate. After brazing, the plate is formed to the final shape and the cooling tubes are welded to the headers. Each step of the fabrication process is monitored by ultrasonic tests. This paper describes the optimization of the parameters controlling the fabrication process such as the machining tolerances of the grooves, the - time temperature cycle of the brazing procedure and the bending of the plate with the brazed cooling tubes. The paper describes moreover the thermal fatigue testing facility, in which the model will be tested. This facility is designed to produce an uniform heat flux to 0.5 Ms/m**2 on the F.W. model surface, by means of tungsten filament quartz lamps. Testing atmosphere, temperature and pressure of the coolant and shape of the temperature cycle will be as close as possible to the operating conditions foreseen for the F.W. of a NET/INTOR type reactor. The aim of the testing programme is to compare the results of the thermal fatigue experiments with the predictions of the existing codes for the design of high temperature components.
Bibliographic Reference: 13TH SYMPOSIUM ON FUSION TECHNOLOGY, VARESE (ITALY), SEPT. 24-28, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907, MENTIONING PAPER E 31725 ORA
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Record Number: 1989123019800 / Last updated on: 1987-01-01
Available languages: en