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Title: Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions

Abstract

This paper presents a two-dimensional structural analysis for the evaluation of a single core subassembly due to internal overpressure associated with possible failure of fuel pins having high fission gas plenum pressure. Structural models are developed for the subassemblies and their surroundings with emphasis on the critical physical aspects of the problem. With these models the strains, deformations and the extent of permanent damage (plastic strain) to the subassemblies can be assessed. The nonlinear structural analyses was performed with a finite element program called STRAW (Structural Transient Response of Assembly Wrappers). This finite element program is applicable to nonlinear large displacement problems. The results of this study indicate that the permanent deformation (damage) is strongly influenced by the rise time (time to reach peak pressure) of the pressure pulse and the pressure in the fuel pin. The rise time is influenced by the opening time of the flow path for release of gas from the fuel pin plenum. Several examples are illustrated with various rise times and pressure magnitudes and the resulting permanent deformation of the hexcan wall.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6152846
Report Number(s):
ANL/RE/CP-79101; CONF-930702-32
ON: DE93015546
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Pressure vessels and piping conference, Denver, CO (United States), 25-29 Jul 1993
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; FUEL PINS; FAILURES; LMFBR TYPE REACTORS; FINITE ELEMENT METHOD; MECHANICAL STRUCTURES; PRESSURIZATION; REACTOR ACCIDENTS; REACTOR SAFETY; RESPONSE FUNCTIONS; S CODES; STAINLESS STEEL-316; STRUCTURAL MODELS; ACCIDENTS; ALLOYS; AUSTENITIC STEELS; BREEDER REACTORS; CALCULATION METHODS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STEELS; COMPUTER CODES; CORROSION RESISTANT ALLOYS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FUEL ELEMENTS; FUNCTIONS; HEAT RESIS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; LIQUID METAL COOLED REACTORS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NUMERICAL SOLUTION; REACTOR COMPONENTS; REACTORS; SAFETY; STAINLESS STEELS; STEEL-CR17NI12MO3; STEELS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210500 - Power Reactors, Breeding

Citation Formats

Pfeiffer, P A, and Kulak, R F. Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions. United States: N. p., 1993. Web.
Pfeiffer, P A, & Kulak, R F. Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions. United States.
Pfeiffer, P A, and Kulak, R F. 1993. "Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions". United States. https://www.osti.gov/servlets/purl/6152846.
@article{osti_6152846,
title = {Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions},
author = {Pfeiffer, P A and Kulak, R F},
abstractNote = {This paper presents a two-dimensional structural analysis for the evaluation of a single core subassembly due to internal overpressure associated with possible failure of fuel pins having high fission gas plenum pressure. Structural models are developed for the subassemblies and their surroundings with emphasis on the critical physical aspects of the problem. With these models the strains, deformations and the extent of permanent damage (plastic strain) to the subassemblies can be assessed. The nonlinear structural analyses was performed with a finite element program called STRAW (Structural Transient Response of Assembly Wrappers). This finite element program is applicable to nonlinear large displacement problems. The results of this study indicate that the permanent deformation (damage) is strongly influenced by the rise time (time to reach peak pressure) of the pressure pulse and the pressure in the fuel pin. The rise time is influenced by the opening time of the flow path for release of gas from the fuel pin plenum. Several examples are illustrated with various rise times and pressure magnitudes and the resulting permanent deformation of the hexcan wall.},
doi = {},
url = {https://www.osti.gov/biblio/6152846}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}

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