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Title: GAS-PRESSURE BONDING OF FLAT-PLATE FUEL ASSEMBLIES

Abstract

subscale fiat-plate fuel subassemblies measuring up to 2 by 2 by 20 in., incorporating 16 Zircaloy-2-clad uranium -zirconium fuel plates and 15 coolant channels, were successfully fabricated by the gas-pressurebonding process. Autoclave design, specimen-container configuration, and the design and preparation of specimen components were among the problems studied. Uneven heating of the bonding specimen, caused in part by convective heat transfer, was minimized by developing a special four-element muffie-type resistance heater for the autoclave and by filling void space between the specimen and heater with copper plates and sand. With this arrangement there was only a 10 to 15 deg F variation over a 36-in. zone at 1500 deg F. A type 304 stainless specimen container design, resembling in cross section a swastika, allowed distortion-free bonding of specimens without supplementary jigging. The practicality of building up an entire assembly from simple, rectanrular pieces was demonstrated. This technique makcs it easier to maintain the close dimensional tolerances required for fabrication of flat-plate assemblies and elimirates the expensive machining required to produce one-piece picture frames. Flat Ti-Namel stock inserted between the Zircaloy-2clad fuel plates during assembly of the components was removed after bonding was completed by acid etching to form the coolantmore » channels. Chromium plating the Ti Namel prevented reaction with the Zircaloy-2. In studies of surface preparation, it was found that removing 2 to 3 mils of surface by reaching belt abrading of the components with 60-grit SiC produced consistent bonding. Bonding of the assemblies at 1550 deg F for 4 hr under a helium pressure of 10,000 psi produced excellent results. (auth)« less

Authors:
; ; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4268139
Report Number(s):
BMI-1312
NSA Number:
NSA-13-008907
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; ACIDS; BONDING; CHEMICAL REACTIONS; CHROMIUM; CONFIGURATION; COOLANT LOOPS; COPPER; ECONOMICS; ETCHING; FUEL CANS; FUEL ELEMENTS; HEAT TRANSFER; HEAT TREATMENTS; HEATING; HELIUM; HIGH TEMPERATURE; INERT GASES; MACHINE PARTS; MACHINING; MECHANICAL STRUCTURES; PLANNING; PLATES; PREPARATION; PRESSURE; PRESSURE VESSELS; SAND; SILICON CARBIDES; STAINLESS STEELS; THICKNESS; URANIUM ALLOYS; VARIATIONS; WEAR; ZIRCALOY; ZIRCONIUM ALLOYS

Citation Formats

Paprocki, S.J., Hodge, E.S., Boyer, C.B., and Getz, R.W. GAS-PRESSURE BONDING OF FLAT-PLATE FUEL ASSEMBLIES. United States: N. p., 1959. Web. doi:10.2172/4268139.
Paprocki, S.J., Hodge, E.S., Boyer, C.B., & Getz, R.W. GAS-PRESSURE BONDING OF FLAT-PLATE FUEL ASSEMBLIES. United States. doi:10.2172/4268139.
Paprocki, S.J., Hodge, E.S., Boyer, C.B., and Getz, R.W. Tue . "GAS-PRESSURE BONDING OF FLAT-PLATE FUEL ASSEMBLIES". United States. doi:10.2172/4268139. https://www.osti.gov/servlets/purl/4268139.
@article{osti_4268139,
title = {GAS-PRESSURE BONDING OF FLAT-PLATE FUEL ASSEMBLIES},
author = {Paprocki, S.J. and Hodge, E.S. and Boyer, C.B. and Getz, R.W.},
abstractNote = {subscale fiat-plate fuel subassemblies measuring up to 2 by 2 by 20 in., incorporating 16 Zircaloy-2-clad uranium -zirconium fuel plates and 15 coolant channels, were successfully fabricated by the gas-pressurebonding process. Autoclave design, specimen-container configuration, and the design and preparation of specimen components were among the problems studied. Uneven heating of the bonding specimen, caused in part by convective heat transfer, was minimized by developing a special four-element muffie-type resistance heater for the autoclave and by filling void space between the specimen and heater with copper plates and sand. With this arrangement there was only a 10 to 15 deg F variation over a 36-in. zone at 1500 deg F. A type 304 stainless specimen container design, resembling in cross section a swastika, allowed distortion-free bonding of specimens without supplementary jigging. The practicality of building up an entire assembly from simple, rectanrular pieces was demonstrated. This technique makcs it easier to maintain the close dimensional tolerances required for fabrication of flat-plate assemblies and elimirates the expensive machining required to produce one-piece picture frames. Flat Ti-Namel stock inserted between the Zircaloy-2clad fuel plates during assembly of the components was removed after bonding was completed by acid etching to form the coolant channels. Chromium plating the Ti Namel prevented reaction with the Zircaloy-2. In studies of surface preparation, it was found that removing 2 to 3 mils of surface by reaching belt abrading of the components with 60-grit SiC produced consistent bonding. Bonding of the assemblies at 1550 deg F for 4 hr under a helium pressure of 10,000 psi produced excellent results. (auth)},
doi = {10.2172/4268139},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {1}
}