The concept of an innovative plate-type steam generator (SG) for a fast reactor, fabricated using hot isostatic pressing (HIP), was presented. The heat-transfer plate, which is assembled with rectangular tubes and fabricated using HIP, is surrounded by a leak-detection layer. The optimum form for the detection layer was determined by crack extension analysis. The concept can be applied in both pool-type and loop-type liquid-metal cooled fast reactors (LMFRs). In this report, the fabrication technique is described as applied to a loop-type LMFR. Optimum HIP conditions of 1423 K (1150°C)⁠, 1200 kgf/cm2(117 MPa)⁠, and 3 h for modified 9Cr–1Mo steel were determined from HIP tests, tensile tests, and structural inspection. Nickel-type solder (BNi-5) and gold-type solder (BAu-4) were examined as potential joining materials to laminate the heat-transfer plates. Tensile test comparisons showed that BAu-4 was superior, so it was used. No problems were observed in the fabrication of a partial model of a SG (HIP of the rectangular tubes, brazing the plates, welding the header, etc.)

Issue Section:
Nuclear Power
Keywords:
alloy steel, boron alloys, brazing, crack detection, fission reactor accidents, fission reactor cooling, fission reactor materials, gold alloys, heat exchangers, heat transfer, hot pressing, leak detection, nickel alloys, nuclear reactor steam generators, solders, tensile testing
Topics:
Brazing, Heat transfer, Leakage, Liquid metal cooled reactors, Manufacturing, Hot pressing, Fracture (Materials), Welding, Heat exchangers, Solders, Plates (structures), Sodium fast reactors, Stress, Steel
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 by American Society of Mechanical Engineers
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