STP1023

    Evaluation of Zircaloy-2 Pressure Tubes from NPD

    Published: Jan 1989


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    Abstract

    The pressure tubes of Canadian Deuterium Uranium (CANDU) reactors are monitored to evaluate their health. The main factors that affect their service life are changes in dimensions, shape, mechanical properties, and flaw tolerance. We have developed equip-ment and techniques to measure these properties and assess the health of the tubes. In this paper we describe the examination of the Zircaloy-2 pressure tubes of the Nuclear Power Demonstration (NPD) reactor. Their dimensional changes posed no problems. However, the combined effect of irradiation and the presence of radial hydrides caused the fracture toughness to decrease to such an extent that it would be difficult to assure leak-before-break in the future. Thus the reactor was closed down after 25 years of operation.

    Keywords:

    Zircaloy-2, pressure tubes, fitness-for-service, shape changes, flaw tolerance, deuterium pick-up


    Author Information:

    Coleman, CE
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    Cheadle, BA
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    Causey, AR
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    Chow, PCK
    Atomic Energy of Canada Limited, Research Company, Whiteshell Nuclear Research Establish-ment, Pinawa, Manitoba

    Davies, PH
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    McManus, MD
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    Rodgers, DK
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    Sagat, S
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario

    van Drunen, G
    Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario


    Paper ID: STP18856S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP18856S


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