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Title: Spring/dimple instrument tube restraint

A nuclear fuel assembly for a pressurized water nuclear reactor has a spring and dimple structure formed in a non-radioactive insert tube placed in the top of a sensor receiving instrumentation tube thimble disposed in the fuel assembly and attached at a top nozzle, a bottom nozzle, and intermediate grids. The instrumentation tube thimble is open at the top, where the sensor or its connection extends through the cooling water for coupling to a sensor signal processor. The spring and dimple insert tube is mounted within the instrumentation tube thimble and extends downwardly adjacent the top. The springs and dimples restrain the sensor and its connections against lateral displacement causing impact with the instrumentation tube thimble due to the strong axial flow of cooling water. The instrumentation tube has a stainless steel outer sleeve and a zirconium alloy inner sleeve below the insert tube adjacent the top. The insert tube is relatively non-radioactivated inconel alloy. The opposed springs and dimples are formed on diametrically opposite inner walls of the insert tube, the springs being formed as spaced axial cuts in the insert tube, with a web of the insert tube between the cuts bowed radially inwardly for forming the spring,more » and the dimples being formed as radially inward protrusions opposed to the springs. 7 figures.« less
Inventors:
;
Issue Date:
OSTI Identifier:
140719
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) OAK; SCA: 220400; 210200; PA: EDB-94:051832; SN: 94001164751
Patent Number(s):
US 5,265,138/A/
Application Number:
TRN: 94:018519
Contract Number:
AC03-90SF18495
Resource Relation:
Other Information: PBD: 23 Nov 1993
Research Org:
Westinghouse Electric Corp
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; 21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; PWR TYPE REACTORS; IN CORE INSTRUMENTS; REACTOR INTERNALS; GUIDE TUBES; RESTRAINTS; FUEL ASSEMBLIES; SLEEVES; DESIGN; POSITIONING