Combustion Engineering, Inc.

Lawrence R Hayes

James K Hayes

Eric M Weisel

Lee A Tade, Iii

Bobby J Presley

A method of remotely installing or removing and assembling and disassembling nozzle dams (10) from outside a steam generator manway (14) using a tool set. The tools are a bifurcated segment lifting (torquing and push-pull) tool 60 to unweight and faciltate the operation of sliding dam segments (30,32) edgewise along sliding brackets (40) and bars (44) in an assembly and disassembly operation; a cam-lock component (36) operating T-shaped tool (80) with a nozzle dam rib avoiding offset (88), transverse quick-connect body (50b) straddling tool (90) pull a sleeve (50c) in order to disassembly quick-connects; and, a gasket installing, tensioning and removing hook tool (102).

Method of remotely installing or removing a nozzle dam

A motorized transporter is placed at the periphery of the tube bundle which extends up from the tube sheet within a nuclear steam generator shell. The transporter can be separated into parts as required to move it into and out of the limited space between the tube bundle and inside wall of the generator. A control station external the generator is connected by flexible cables to the transporter and its equipment in order to move the transporter, observe the transporter path for foreign objects, and retrieve such objects.

Equipment transporter for nuclear steam generator

A nuclear steam generator including a vessel, means to introduce vaporizable fluid into the bottom portion of the vessel, an outlet near the top through which vapor is discharged, a horizontal tube sheet extending across the vessel, a plurality of U-shaped tubes, having each end secured to and extending through the tube sheet, means for introducing heating fluid to one end of each of the U-shaped tubes, means for removing heating fluid from the other end of each of the U-shaped tubes, tube support means positioned within the vessel for preventing tube vibration, the tube support means including horizontally positioned means closely surrounding, but slightly spaced from each tube, means through which access can be had to the vessel interior beneath the tube sheet when the steam generator is not in operation, and testing means for determining whether or not a tube is locked into a tube support means including a longitudinal member, with a first end located inside the tube to be tested, and a second end located outside of the tube, means for securing the first end of the member to the inside of the tube, means for heating a length of the longitudinal member, and an equal length of the tube, to an elevated temperature, and means for indicating movement of the second end of the longitudinal member away from the tube end, which would indicate that the tube is locked into the support means.

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Ringgold, GA, United States of America

Lawrence R Hayes