DefinePK

Abstract

The design of Liquid Metal Fast Breeder Reactor systems (LMFBR) requires consideration of elevated-temperature, time-dependent deformation, since many components will be operating at temperatures in the creep range of the materials of construction. Therefore a suitable method of establishing the stress-strain-time-temperature relationships for these materials is necessary for use in the design of such high temperature components. Although 316 L(N) Stainless Steel is specified by ASME nitrogen in range of 0.1 to 0.16 Wt.%, for Prototype Fast Breeder Reactor (PFBR), nitrogen content is limited to 0.08 Wt. %, in view of improved weld ability, code data availability and for minimizing scatter mechanical properties. For high temperature components operating in creep Range 316L (N) has been favored. Other major advantages of austenitic stainless steel 316L (N) include existence of vast data on mechanical properties including very long term creep data, ease of availability and fabrication above all the availability of design data in the ASME code selected for PFBR design.