High temp. gas cooled reactor absorber rod - guiding coolant gas down centre and up outer annulus

摘要

A high-temp. gas-cooled reactor is fitted with absorber rods which are moved directly into the pebble pile. The coolant gas passes in the absorber rod centrally downward along one of the concentric jackets for the absorber part. After deflection at the point bottom end the gas flows up in the outer annulus to the exit holes at a given height above the point. This eliminates any possible high temp. differential or stresses in the material along the absorber rod and at its point.