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Nuclear reactor fuel assemblies

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1. A NUCLEAR REACTOR FUEL ASSEMBLY COMPRISING AN ELONGATED TUBULAR CASING, A PACK OF PLAIN-FACED CLAD FUEL PLATES EXTENDING AXIALLY WITHIN SAID CASING, UNFUELED SHEET METAL SPACERS, SAID SPACERS BEING GENERALLY COEXTENSIVE WITH AND INTERLEAVED BETWEEN SAID PLATES AND BETWEEN THE OUTER PLATES OF SAID PACK OF PLATES AND THEIR RESPECTIVELY OPPOSING CASING WALLS, SAID SPACERS BEING CORRUGATED TO GIVE LINES OF CONTACT WITH PLATES FROM ONE END OF SAID PACK TO THE OTHER END OF SAID PACK, SAID SPACERS BEING RESILIENTLY COMPRESSIBLE BY VIRTUE OF THE CORRUGATIONS AND BEING IN A STATE OF COMPRESSION WITHIN SAID ASSEMBLY TO HOLD SAID PACK OF PLATES TIGHTLY IN SAID CASING, AND WHEN IN SAID COMPRESSED STATE, THE SPACING OF SAID LINES OF CONTACT DOES NOT EXCEED SEVEN TIMES THE DISTANCE OF SEPARATION BETWEEN THE OPPOSED FACES OF ADJACENT FUEL PLATES.
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