抄録
A suitable surveillance test program was developed for evaluating the change in fracture toughness of material after long service operation using a retired petroleum reactor pressure vessel. The surveillance program is based on the correlation derived in advance from the standard Charpy absorbed energy (CV) and fracture toughness (KIc, KId) data for pre-service material and on the Charpy energy (CV) obtained from the periodic surveillance after service operation.
It is here demonstrated that KId(CV) estimated from the Charpy data shows a good agreement with valid KId determined experimentally for all the base metal, weld deposit and heat affectted zone (HAZ) of the material. The validity of the surveillance program was also discussed.
