Pebble-bed reactor

Details Pebble-bed reactor Pebble-bed reactor

1975-02-13

1976-06-01

Behrend, Harvey E.

176 32, G21C 344

Patent

active

039606562

ABSTRACT:
A pebble-bed nuclear reactor of large power rating comprises a container having a funnel-shaped bottom forming a pebble run-out having a centrally positioned outlet. A bed of downwardly-flowing substantially spherical nuclear fuel pebbles is positioned in the container and forms a reactive nuclear core maintained by feeding unused pebbles to the bed's top surface while used or burned-out pebbles run out and discharge through the outlet. A substantially conical body with its apex pointing upwardly and its periphery spaced from the periphery of the container spreads the bottom of the bed outwardly to provide an annular flow down the funnel-shaped bottom forming the run-out, to the discharge outlet. This provides a largely constant downward velocity of the spheres throughout the diameter of the bed throughout a substantial portion of the down travel, so that all spheres reach about the same burned-out condition when they leave the core, after a single pass through the core area.

REFERENCES:
patent: 2975116 (1961-03-01), Daniels
patent: 3034689 (1962-05-01), Stoughton et al.
patent: 3336203 (1967-08-01), Rausch et al.

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