5757

MODEL S5W REFUELING SOURCE. SHIPPING CONTAINER CONSISTING OF TWO STRUCTURES, ONE NESTED WITHIN THE OTHER, HAVING AN OVERALL ENVELOPE OF 5 FEET, 5 INCHES DIAMETER BYY 9 FEET, 5-5/8 INCHES LENGTH. THE OUTER STRUCTURE, THE SHIPPING CONTAINER, IS A RING OF POLYETHYLENE 11-1/2 INCHES THICK WITH AN OD OF 5 FEET 4 INCHES AND LENGTH OF APPROXIMATELY 5 FEET 2 INCHES. THE POLYETHYLENE IS CANNED IN A 1/2-INCH THICK CARBON STEEL SHELL. THE INNER STRUCTURE, THE REPLACEMENT AND INSTALLATION CONTAINER, FITS INTO THE CAVITY OF THE OUTER STRUCTURE. THIS ASSEMBLY CONSISTS OF A 6-1/2 INCH OD, 79-5/8 INCHES LONG STAINLESS CENTRAL TUBE, WHICH IS PLUGGED AT BOTH ENDS BY MACHINED STAINLESS STEEL FORGING. THREE CAVITIES ARE MACHINED IN THE BOTTOM END PLUG TO CONTAIN THE NEUTRON SOURCE ASSEMBLIES. A JACKET OF LEAD, 6 INCHES THICK, ENCIRCLES THE CENTRAL TUBE AND THIS INNERMOST LAYER OF SHIELDING IS A ATTENUATE T HE GAMMA RADIATION. A WALL OF POLYETHYLENE, 8-1/2 INCHES THICK, SURROUNDS THE LEAD SHIELD AND IS CANNED WITH A 1/2-INCH THICK CARBON STEEL PLATE. GROSS WEIGHT IS APPROXIMATELY 19,000 POUNDS.