论文信息 - Use of load path dependent material fracture toughness values (WPS) in the safety analysis of RPV stade

Use of load path dependent material fracture toughness values (WPS) in the safety analysis of RPV stade

Abstract The effect of warm prestressing (WPS) has been investigated for the specific material and loading conditions of the central circumferential weld of the reactor pressure vessel of KKS under emergency core cooling. Warm prestressing results in a significant rise of effective fracture toughness. The magnitude of the WPS-effect as a function of warm prestressing, path of unloading, amount of cooling (e.g. change of yield stress) can be predicted on the basis of a theoretical model of Chell et al.. Crack initiation can be excluded for emergency core cooling (ECC)-loading and for material conditions beyond end of life for the central circumferential weld of the pressure vessel of KKS.

[1] L. Hodulak,et al. Material characterization by J-R curves of a 20MnMoNi55 forging , 1984 .

[2] G. Chell. A Fracture Mechanics Approach to Predicting the Effects of Warm Prestressing and its Applications to Pressure Vessels , 1979 .

[3] A. Cowan,et al. A review of warm prestressing studies , 1983 .

[4] G. D. Fearnehough,et al. The Influence of Warm Prestressing on the Brittle Fracture of Structures Containing Sharp Defects , 1972 .

[5] D. A. Curry,et al. A micromechanistic approach to the warm pre-stressing of ferritic steels , 1981 .

[6] F. J. Loss,et al. Significance of warm prestress to crack initiation during thermal shock. Interim report. [Loss of coolant accidents] , 1977 .

[7] L. P. Harrop,et al. Warm pre-stressing during severe thermal shock loading of a pressure vessel , 1979 .

[8] G. G. Chell,et al. A theory of warm prestressing: experimental validation and the implications for elastic plastic failure criteria , 1981, International Journal of Fracture.