STP903

    18—18 Corrosion-Resistant Retaining Rings for Nuclear Power Plant Generators

    Published: Jan 1986


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    Abstract

    Several years ago, the Pamiers Plant of the Compagnie Française de Forges et Fonderies (C3F) undertook a research program on the 18-18 corrosion-resistant grade for retaining rings.

    An extensive testing program conducted in association with Electricite de France led to a decision to equip the 900- and 1300-MW generators of French nuclear power plants with NMF 18 retaining rings (NMF 18 is the C3F trademark for the 18-18 material).

    To date, 20 rings have been manufactured in the following sizes: 1. Outer diameter: 1746 to 2040 mm (68.74 to 80.31 in.). 2. Thickness: 83 to 90 mm (3.27 to 3.74 in.). 3. Height: 700 to 775 mm (27.56 to 30.51 in.). 4. Weight: 2.5 to 3.5 metric tons.

    The guaranteed yield strength at midwall is 750, 850, or 900 MPa (109, 123, or 130 ksi), depending on the type of ring.

    After a review: (a) of the properties of the 18-18 grade and their comparison with the conventional 18-4 material and (b) of the principal results of the test program, we are describing the specifics of the manufacturing process and the facilities of these large rings.

    Keywords:

    Nonmagnetic rings, austenitic manganese steels, corrosion-resistant grades, stress corrosion


    Author Information:

    Rambaud, JB
    Technical manager, Usinor, Paris,

    Cazenave, RH
    Chief metallurgist, Pamiers Plant, Compagnie Française de Forges et Fonderies, Pamiers,


    Paper ID: STP17363S

    Committee/Subcommittee: A01.14

    DOI: 10.1520/STP17363S


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