DETERMINATION OF THE GUARANTEED VALUE OF THE CRITICAL EMBRITTLEMENT TEMPERATURE FOR STEEL 15KH2NMFA-A

It is demonstrated that the values of the impact toughness of a crack initiation and of the impact toughness proper can be successfully used as the criteria for determining the critical embrittlement temperatur e. The guaranteed value of the critical embrittlement temperature is d efined as the intersection point of the approximated curves of the low er confidence boundary of the impact toughness and the upper shelf lin e of the impact toughness of the crack initiation with a probability o f 95%. The method developed has been used for determining the guarante ed value of the critical embrittlement temperature of the material for the shells of the active section of VVER-1000 nuclear reactors.