Thermal transient strength test of a welded vessel model; No.1 Design and fubrication of the model

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Thermal transient strength tests in using the Thermal Transient Strength Test Facility for Structures (TTS) have been carried out to develop the design method for fast breeder reactor components under thermal loadings. The design and the fabrication of the Welded Vessel Model which is to be tested at TTS are described in this report. In this model, the noteworthy typical shape and stress distribution as seen in the structural design of Large Fast Breeder Reactor (LFBR) and the modified SUS316 which is a hopeful material for LFBR are incorporated. The Welded vessel Model is a cocoon-like model which has 25mm thickness, 2210mm hight and 850mm inner diameter, and it has seven test portions of interest, namely inlet/outlet nozzle, upper/skirt Y-janctions, vessel ring, inner shell ring and inner shell support flange. In design of this model, thermal transient conditions were established by performing Hydraulic-thermal analyses, and then, heat transfer analyses and thermal stress analyses were performed. Test portions of interest were evaluated using the special design guide for TTS tests. Materials and welding method adopted are basically the ones applicable to LFBR's reactor structures.