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    Integral Forged Pump Casing for the Primary Coolant Circuit of a Nuclear Reactor: Development in Design, Forging Technology, and Material


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    Developments in the forging of large casings for primary circuit coolant pumps for light water reactors in Germany are demonstrated beginning with the multiple forging fabricated version and ending with the integral forged type. This version is the result of the joint efforts of the pump manufacturer and the forgemaster after a cost-gain evaluation and represents an optimum solution in view of its functional and economical performance and also considering the high requirements for mechanical-technological properties, including homogeneity of the material. The development from 22 NiMoCr 3 7/A 508 Class 2 to 20 MnMoNi 5 5/A 508 Class 3 and their optimization will be demonstrated. This development is based mainly on minimizing the sulfur content and on vacuum carbon deoxidation (VCD), which results in a reduction of the A-segregations, in improving fracture toughness and isotropy, and in the desired fine-grain structure.


    castings for reactor primary coolant pumps, forged/welded version, integral forged version, reactor pressure vessel steels, segregations, vacuum carbon deoxidation (VCD), fracture toughness, mechanical properties, isotropy

    Author Information:

    Austel, W
    Managers, Schmiedewerke, Krupp-Klöckner, GMBH, Osnabrück,

    Körbe, H
    Managers, Schmiedewerke, Krupp-Klöckner, GMBH, Osnabrück,

    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP17369S