STP1366

    Effect of Irradiation on Fracture Toughness in the Transition Range of RPV Steels

    Published: Jan 2000


      Format Pages Price  
    PDF Version (380K) 16 $25   ADD TO CART
    Complete Source PDF (27M) 16 $371   ADD TO CART


    Abstract

    The effect of irradiation on cleavage fracture toughness in the ductile-brittle transition range of RPV steels was studied using precracked Charpy-V (PCCv) specimens. Four kinds of RPV steels of ASTM A533B class 1 made by Japanese steel makers were used for this study. Neutron irradiation to PCCv specimens was carried out at JMTR. An approach based on the weakest link theory was applied to analyze the specimen size effect and the scatter of fracture toughness. The scatter of fracture toughness was confirmed to have a Weibull type distribution. Irradiation effect on the scatter was found insignificant. The fracture toughness transition curves were determined by PCCv data according to the master curve approach and the Japanese code. The shift of the master curve due to neutron irradiation was somewhat greater than the Charpy 41J shift. The scheme to estimate the lower bound of fracture toughness was also studied.

    Keywords:

    reactor pressure vessel, surveillance, structural integrity, irradiation embrittlement, fracture toughness, precracked Charpy, master curve, lower bound


    Author Information:

    Onizawa, K
    Senior Engineer, Research Engineer and Head, Reactor Component Reliability Laboratory, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Tobita, T
    Senior Engineer, Research Engineer and Head, Reactor Component Reliability Laboratory, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Suzuki, M
    Senior Engineer, Research Engineer and Head, Reactor Component Reliability Laboratory, Japan Atomic Energy Research Institute, Ibaraki-ken,


    Paper ID: STP12391S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP12391S


    CrossRef ASTM International is a member of CrossRef.