Pressure-tube nuclear reactor including fuel assembly with thermal baffle

Claim 1

IN A NUCLEAR REACTOR WHEREIN U-SHAPED PRESSURE-TUBES ARE SUSPENDED WITHIN A TANK OF LIQUID MODERATOR, FUEL ASSEMBLIES ARE DISPOSED WITHIN THE LEGS OF THE PRESSURE-TUBES, AND PRIMARY COOLANT IS CIRCULATE THROUGH THE PRESSURETUBES, AN IMPROVED FUEL ASSEMBLY COMPRISNG A FLOW BAFFLE OF TUBULAR SHAPE WITH A PLURALITY OF FLAT SIDES, A HOLLOW CYLINDRICAL THERMAL BAFFLE SURROUNDING SAID FLOW BAFFLE IN CYLINDRICAL THERMAL BAFFLE SURROUNDING SAID FLOW BAFFLE IN SPACED RELATIONSHIP THERETO, AN UPPER GUIDE RING AND A LOWER QUIDE RING TO WHICH THE UPPER AND LOWER ENDS OF SAID FLOW BAFFLE AND SAID THERMAL BAFFLE ARE ATTACHED, A GRID MEMBER EXTENDING ACROSS THE COOLANT FLOW PATH DEFINED BY SAID FLOW BAFFLE AND SAID GUIDE RINGS, A PLURALITY OF FUEL RODS POSITIONED BY SAID GRID MEMBER IN PARALLEL RELATIONSHIP AND HELD NESTED TOGETHER BY SAID FLOW BAFFLE, SPACING MEANS PROVIDED ON SAID FUEL ELEMENTS OF SUCH A SIZE AS TO MAINTAIN PROPER SPACING THEREBETWEEN WHEN IN NESTED RELTATIONSHIP WITHIN SAID FLOW BAFFLE, AND APERTURES NEAR THE INLET END OF SAID FLOW BAFFLE TO PROVIDE STAGNANT PRIMARY COOLANT BETWEEN SAID BAFFLES.