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Title: Transfer of fuel assemblies

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
Authors:
; ;
Publication Date:
OSTI Identifier:
5874201
Report Number(s):
US 4487741
TRN: 85-010187
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