The effect of density deviation on concrete attenuation effectiveness

In the work, the influence of concrete density deviation on shield thickness and total dose ratio outside the reactor shield, has - on the basis of numerical analysis - been considered. The possibility of introducing flexible corrections - without additional shielding calculation - to the design thickness of the shield has been noticed. It has been found that in common cases of shield design, where does not exist any necessity of minimizing the shield thickness, the tendency to minimize the value of this deviation is hardly substantiated. (author)