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Title: Transfer of fuel assemblies

Abstract

Fuel assemblies of a nuclear reactor are transferred during fueling or refueling or the like by a crane. The work-engaging fixture of the crane picks up an assembly, removes it from this slot, transfers it to the deposit site and deposits it in its slot at the deposit site. The control for the crane includes a strain gauge connected to the crane line which raises and lowers the load. The strain gauge senses the load on the crane. The signal from the strain gauge is compared with setpoints; a high-level setpoint, a low-level setpoint and a slack-line setpoint. If the strain gauge signal exceeds the high-level setpoint, the line drive is disabled. This event may occur during raising of a fuel assembly which encounters resistance. The high-level setpoint may be overridden under proper precautions. The line drive is also disabled if the strain gauge signal is less than the low-level setpoint. This event occurs when a fuel assembly being deposited contacts the bottom of its slot or an obstruction in, or at the entry to the slot. To preclude lateral movement and possible damage to a fuel assembly suspended from the crane line, the traverse drive of the crane ismore » disabled once the strain-gauge exceets the lov-level setpoint. The traverse drive can only be enabled after the strain-gauge signal is less than the slack-line set-point. This occurs when the lines has been set in slack-line setting. When the line is tensioned after slack-li ne setting, the traverse drive remains enabled only if the line has been disconnected from the fuel assembly.« less

Inventors:
; ;
Publication Date:
OSTI Identifier:
5874201
Patent Number(s):
US 4487741
Application Number:
TRN: 85-010187
Assignee:
Westinghouse Electric Corp. EDB-85-072008
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 30 Nov 1981; Other Information: PAT-APPL-325881
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; FUEL ASSEMBLIES; MATERIALS HANDLING; MATERIALS HANDLING EQUIPMENT; REACTOR FUELING; REACTOR SAFETY; REACTORS; STRAIN GAGES; EQUIPMENT; MEASURING INSTRUMENTS; SAFETY; 220300* - Nuclear Reactor Technology- Fuel Elements

Citation Formats

Vuckovich, M., Burkett, J. P., and Sallustio, J.. Transfer of fuel assemblies. United States: N. p., 1984. Web.
Vuckovich, M., Burkett, J. P., & Sallustio, J.. Transfer of fuel assemblies. United States.
Vuckovich, M., Burkett, J. P., and Sallustio, J.. 1984. "Transfer of fuel assemblies". United States. doi:.
@article{osti_5874201,
title = {Transfer of fuel assemblies},
author = {Vuckovich, M. and Burkett, J. P. and Sallustio, J.},
abstractNote = {Fuel assemblies of a nuclear reactor are transferred during fueling or refueling or the like by a crane. The work-engaging fixture of the crane picks up an assembly, removes it from this slot, transfers it to the deposit site and deposits it in its slot at the deposit site. The control for the crane includes a strain gauge connected to the crane line which raises and lowers the load. The strain gauge senses the load on the crane. The signal from the strain gauge is compared with setpoints; a high-level setpoint, a low-level setpoint and a slack-line setpoint. If the strain gauge signal exceeds the high-level setpoint, the line drive is disabled. This event may occur during raising of a fuel assembly which encounters resistance. The high-level setpoint may be overridden under proper precautions. The line drive is also disabled if the strain gauge signal is less than the low-level setpoint. This event occurs when a fuel assembly being deposited contacts the bottom of its slot or an obstruction in, or at the entry to the slot. To preclude lateral movement and possible damage to a fuel assembly suspended from the crane line, the traverse drive of the crane is disabled once the strain-gauge exceets the lov-level setpoint. The traverse drive can only be enabled after the strain-gauge signal is less than the slack-line set-point. This occurs when the lines has been set in slack-line setting. When the line is tensioned after slack-li ne setting, the traverse drive remains enabled only if the line has been disconnected from the fuel assembly.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month =
}
  • A description is given of a hood for transferring fuel assemblies between two or more separate guide ramps inclined to the vertical at the same angle of slope and extending respectively through a first passage into the reactor vessel and through a second passage into a fuel-assembly storage chamber. The hood comprises at least one shielded duct joined to a flanged rotating portion which is so arranged that the open lower end of the shielded duct is positioned in the line of extension of one guide ramp and then the other as a result of displacement of the rotating portion.more » (Official Gazette)« less
  • BS>A reactor fuel element assembly consisting of a graphite sleeve containing a cluster of fuel elements is patented. The fuel elements are positioned to their ends by one or more rings at each end of the sleeve. When the assembly is placed end-to-end with a similar assembly, adjoining ring surfaces permit laminar flow of coolant through the sleeves. The rings have a hollow, semi-elliptical cross section. (M.P.G.)
  • A rotary transfer subsystem is described for transferring production fluids, electrical power, hydraulic power, and control signals across a rotating interface between an offshore vessel and a flowline bundle of service hoses and high-pressure hoses which are connected to a deepwater production riser system. Tensioning devices are also described for maintaining a selected tension on terminal hoses between the interface and the vessel while the vessel weathervanes during maintenance of position in a watch circle above the riser system. The subsystem and the tensioning devices are mounted on the vessel which is equipped with a powered turret within a circularmore » moonpool and is capable of performing most subsea service functions on the riser system without major equipment support. The subsystem and the tensioning devices, in combination, comprise a column assembly which is attached to the turret and supports horizontal loops of terminal hoses; a multi-passage swivel for accommodating a portion of the terminal hoses containing gas; a tower for selectively tensioning these hoses and for connecting them to production piping; a traveling sheave and drive mechanism which supports horizontal loops of the remaining hoses while maintaining tension on them and adjusting their lengths, between connections to storage facilities in the vessel and to the column assembly, while the column assembly remains rotatably stationary with respect to the flowline bundle during weathervaning of the vessel through at least 270/sup 0/; and hose support trays for supporting horizontal spans of all hoses between the tower and the column and between the column and the traveling sheave.« less