Ferritic steels are widely used in reactor pressure vessel constructions. In the transition region, fracture toughness of the material drops drastically as the temperature drops. Local approach has been used to compute 'σ_u' and 'm', Beremin's parameters (material properties) at different temperatures considered. The material under study is the reactor pressure vessel Steel 22MnMoNi55 low alloy ferritic steel. Brittle fracture has been analyzed and probability of cleavage failure is calculated using Beremin's model. Numerical simulation (2D FEA) of tensile test was carried out on 30 round notched tensile specimens (RTNS) at -50°C, -100°C and -150°C each to determine material properties 'σ_u'(scaling parameter) and 'm' (shape parameter).
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