Nuclear reactor of a ball-bed type for batch-wise use of core fu

Details Nuclear reactor of a ball-bed type for batch-wise use of core fu Nuclear reactor of a ball-bed type for batch-wise use of core fu

1989-11-06

1991-09-24

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

376458, G21C 1900

Patent

active

050512307

ABSTRACT:
A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements more or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroduced, is initially partly filled with fuel balls of which two-thirds have a fissionable material content 12% below and the upper third 24% higher than the average content. This filling meets the requirements of criticality in order to begin operation. Thereafter, fuel balls are added slowly, a few hundred per day, having 150 to 250% of the average fissionable material content of the initial loading thus preserving the criticality requirements, while keeping the temperature within safe limits until the reactor cavern is filled. Thereafter the reactor is shut down, cooled off, pressure relieved and emptied, the last step typically from above. An ordered array of the fuel balls in regular layers avoids excess pressure loads on the reflector over the life time of the filling. For a random packing of the balls of a cross-section of the cavern that increases somewhat from the bottom upwards also avoids the excess pressure loads on the reflector.

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"Questions of Atomic Science and Technology", Published in Moscow, 1984, pp. 40 & 41.

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