J and J' integral evaluation of a crack in a reactor pressure vessel under pressurized thermal shock

J and J' integrals are evaluated for an assumed crack in a rector pressure vessel under pressurized thermal shock (PTS) conditions. First, two dimensional analyses are carried out assuming the cladding on the inner surface of the vessel wall. Several kinds of PTS conditions are treated, and it is shown that the RFT condition gives the most severe results. J values are compared with JIc and JIa and the possibilies of the crack growth in the vessel wall are discussed. Second, three dimensional analyses are conducted and the results are compared with those of two dimensional analyses. (author)