G - Physics – 21 – C
Patent
G - Physics
21
C
359/38
G21C 9/00 (2006.01) G21C 9/027 (2006.01)
Patent
CA 1091366
ABSTRACT A nuclear reactor having an inherently safe automatic shutdown capability. The nuclear reactor comprises a pressure vessel, a core located within the vessel and containing a sufficient amount of fissionable material to establish and sustain a chain-type fission reaction, and a plurality of elongated conduits disposed in a regular arrangement within the vessel. Each of the conduits defines a fluid flow path and comprises a first section located within and extending through the core, and a second section located exteriorly of the core and positioned above the first section. Each of the conduits contains a plurality of substantially spherical bodies having a high neutron absorption cross section. The bodies are present in a sufficient quantity to substantially fill the first section of each of the conduits and have a diameter of less than about one-half that of the narrowest part of the fluid flow path of the conduit, so that said bodies are freely movable through said conduits. The conduits are provided with a first fluid connection to a lower part of the first section and a second fluid connection to an upper part of the second section for the passage of a pressurized fluid therethrough while maintaining the reactor in operation. The nuclear reactor further comprises a means for supplying the pressurized fluid to said first fluid connection for moving all of said plurality of bodies from the first section to said second section of each of the elongated conduits to form a hydraulically stacked bed of the spherical bodies. A bypass means is located intermediate the second fluid connection, and the second section of each of the conduits and includes a plurality of fluid passageways distributed along the length of the second section to provide a ratio of the length of the second section provided with fluid passageways to the length of the second section occupied by the stacked bed of bodies of from about 0.5:1 to 1.2:1 for permitting a portion of the pressurized fluid to bypass a portion of the stacked bed of bodies during normal operation of the reactor. Each of the plurality of fluid passageways has a cross-sectional area less than that of any single spherical body.
288043
Ash Edward B.
Bernath Louis
Facha Joseph V.
Ridout & Maybee Llp
Rockwell International Corporation
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