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Dynamic response of single hexagonal LMFBR core subassembly wrappers

Abstract

To analyze the dynamic structural response of the LMFBR core subassembly hexagonal wrappers to postulated local energy releases and the sensitivity of the response to variations in both the pressure loading and the material properties of the stainless steel, a finite-element computer code STRAW has been developed. A series of experiments was performed to study the effects of variations in material properties. The amount of coldworking to which the Type 316 stainless steel is subjected has a strong influence upon the ductility and the elastic yield point. The usual fabrication process produced a nominally 20% coldworking with a yield point of about 680 MPa. By designing a special set of dies for the drawing process, a very low ductility hexcan was produced for which the yield point was raised to 820 MPa. Conversely, the yield point was lowered to 170 MPa by a solution annealing process producing a highly ductile test hexcan. A metallurgical study was conducted to find a representative brittle simulant material for the irradiated end-of-life steel properties. An aging treatment for Type 446 stainless steel was developed which reproduced the expected tensile-flow behavior of the in-pile subassembly. Further study is underway to investigate the fracture properties of  More>>
Publication Date:
Jul 01, 1977
Product Type:
Conference
Report Number:
INIS-mf-4592; CONF-770807-(Pt.E)
Reference Number:
AIX-10-426499; ERA-04-054730; EDB-79-117147
Resource Relation:
Conference: 4. international conference on structural mechanics in reactor technology, San Francisco, CA, USA, 15 Aug 1977; Related Information: Part of Transactions of the 4th international conference on structural mechanics in reactor technology, Vol. E. Structural Dynamics in Fast Reactor Accident Analysis
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; LMFBR TYPE REACTORS; RESPONSE FUNCTIONS; FAILURES; FUEL ASSEMBLIES; HEXAGONAL CONFIGURATION; PRESSURE DEPENDENCE; REACTOR ACCIDENTS; S CODES; STAINLESS STEELS; STRAINS; ACCIDENTS; ALLOYS; BREEDER REACTORS; CHROMIUM ALLOYS; COMPUTER CODES; CONFIGURATION; CORROSION RESISTANT ALLOYS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FUNCTIONS; IRON ALLOYS; IRON BASE ALLOYS; LIQUID METAL COOLED REACTORS; REACTORS; STEELS; 210500* - Power Reactors, Breeding
Sponsoring Organizations:
US ERDA
OSTI ID:
6077830
Research Organizations:
Commission of the European Communities, Brussels (Belgium)
Country of Origin:
CEC
Language:
English
Submitting Site:
INIS
Size:
11 p.
Announcement Date:
Apr 01, 1979

Citation Formats

Ash, J. E., Marciniak, T. J., and (Argonne National Lab., IL (United States)). Dynamic response of single hexagonal LMFBR core subassembly wrappers. CEC: N. p., 1977. Web.
Ash, J. E., Marciniak, T. J., & (Argonne National Lab., IL (United States)). Dynamic response of single hexagonal LMFBR core subassembly wrappers. CEC.
Ash, J. E., Marciniak, T. J., and (Argonne National Lab., IL (United States)). 1977. "Dynamic response of single hexagonal LMFBR core subassembly wrappers." CEC.
@misc{etde_6077830,
title = {Dynamic response of single hexagonal LMFBR core subassembly wrappers}
author = {Ash, J. E., Marciniak, T. J., and (Argonne National Lab., IL (United States))}
abstractNote = {To analyze the dynamic structural response of the LMFBR core subassembly hexagonal wrappers to postulated local energy releases and the sensitivity of the response to variations in both the pressure loading and the material properties of the stainless steel, a finite-element computer code STRAW has been developed. A series of experiments was performed to study the effects of variations in material properties. The amount of coldworking to which the Type 316 stainless steel is subjected has a strong influence upon the ductility and the elastic yield point. The usual fabrication process produced a nominally 20% coldworking with a yield point of about 680 MPa. By designing a special set of dies for the drawing process, a very low ductility hexcan was produced for which the yield point was raised to 820 MPa. Conversely, the yield point was lowered to 170 MPa by a solution annealing process producing a highly ductile test hexcan. A metallurgical study was conducted to find a representative brittle simulant material for the irradiated end-of-life steel properties. An aging treatment for Type 446 stainless steel was developed which reproduced the expected tensile-flow behavior of the in-pile subassembly. Further study is underway to investigate the fracture properties of the simulant material. The pressure pulses were generated by the controlled expansion of high-pressure detonation poducts from low-density explosives detonated inside a vented steel cannister. The orifice configuration of the cannister and the charge mixture ratio were designed to produce two specified pulse shapes. A charge containing 37,7 g PETN mixed with 35 wt % inert, hollow-glass microballoons developed a pressure pulse peak of 9.5 MPa at 1.0 ms. Increasing the PETN to 41 g resulted in a 14.6 MPa peak pressure, and increasing the explosive concentration to 90 wt % in the mixture increased the burning rate and the pulse risetime, so that the peak occurred at 0.6 ms.}
place = {CEC}
year = {1977}
month = {Jul}
}