Patent ID: 6862331

Claim:
A reactor core cooling structure that has a circular reactor core filled with a spherical fuel, and is applied to a pebble bed high temperature gas reactor for carrying reaction heat of said circular reactor core by a cooling gas consisting of any of helium and carbon dioxide, the structure comprising: cooling gas flow-in slits for making said cooling gas flow in said circular reactor core, which slits are provided at an outer graphite cylinder for covering an outside of said circular reactor core; cooling gas flow-out slits for making said cooling gas flow out from said circular reactor core, which slits are provided at an inner graphite cylinder for covering an inside of said circular reactor core; a circular cooling gas flow path that is provided at an outside of said outer graphite cylinder, and is connected to an inlet piping of said cooling gas at a foot of the outer graphite cylinder; and an inner cooling gas flow path that is provided at an inside of said inner graphite cylinder, and is connected to an outlet piping of said cooling gas at a foot of the inner graphite cylinder.