دانلود رایگان مقاله طراحی سازه دال سقف راکتور سریع استخر سدیم سرد

Abstract

The roof slab of the nuclear reactor supports all the components of the reactor. Roof slab is essentially a box structure with top and bottom plates interconnected by vertical shells and radial stiffeners welded to them. The gap between the top and bottom plates is filled with concrete that provides biological and thermal shielding in the top axial direction of the reactor. The 500 MWe Prototype Fast Breeder Reactor (PFBR) is designed based on the Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE) which are categorized under level A and level D loadings respectively. The primary objective of this work is to optimize the design of the roof slab and to predict and ascertain the structural integrity of the optimized roof slab under static, harmonic and seismic loading conditions. Regression models for critical design parameters are developed and are used in the optimization algorithm.

6. Conclusion

The roof slab considered in this work plays an important role in the structural health of a nuclear reactor as it supports the entire load of the reactor. Hence; the structural integrity assessment of roof slab is mandatory and has been investigated in this work. The prime objective of this work is to carry out design optimization of the roof slab to reduce the overall weight of the nuclear reactor. A metamodel based optimization approach has been adopted in the present work. The design optimization of roof slab using metamodels has yielded a weight reduction of 19.44% as the weight of roof slab is reduced by 30.37 tonnes from the total weight of 155 tonnes. The optimum configuration of roof slab is checked for the design adequacy using static, harmonic and seismic analysis. It is demonstrated based on numerical investigations that the optimized roof slab meets the functional and structural integrity requirements mentioned in the RCC-MR code.