Issues with Shield Wall in Nuclear Reactors: Nano Concrete for Better Performance

Abstract

Purpose

The study explores the potential of nano concrete in shield walls, in the absence of due studies from an attenuation point of view.

Methodology

The study adopts a conceptual and an experimental approach to explore the potential of nano concrete in enhancing durability and attenuation of radiation for shield walls. The methodology involves avoiding fine and coarse aggregates and availing fly ash both as pozzolan and micro-aggregate to refine the microstructure and reduce porosity. Laboratory trials were conducted to evaluate mechanical strength, permeability and long-term durability under simulated environmental conditions. Comparative analysis was carried out between standard concrete and nano concrete mixes to highlight improvements in microstructure and service life. In addition, attenuation properties have yet to be conducted by exposing prepared specimens blended with radiation-resistant chemicals to radiation sources, measuring the reduction in intensity through various compositions across varying thicknesses.

Findings

The findings indicate that nano concrete, with its ceramic-like microstructure, significantly improves its pore refinement, impermeability, durability and service life, added with superior strengths.

Practical Implications

The presence of mullite at >20% in fly ash renders its part of attenuation to moderate levels. The practical implications of this study suggest that nano concrete can significantly enhance the service life and functional performance of shield walls in critical infrastructure. By pore refinement and improved microstructural integrity, the material offers better resistance to environmental degradation, thereby lowering maintenance costs and extending service life.

Research Limitations

While the study presents insights into nano concrete for durability, the economic feasibility and the potential performance against radiation attenuation have yet to be established.