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Influence of fuel-cladding system deviations from the model of continuous cylinders on the parameters of WWER fuel element working ability

Abstract

In the programs of fuel rod computation, fuel and cladding are usually presented in the form of coaxial cylinders, which can change their sizes, mechanical and thermal-physical properties. The real fuel element has some typical deviations from this continuous coaxial cylinders (CCC) model as: axial asymmetry of fuel-cladding system (due to the oval form of the cladding, cracking and other type of fuel pallet damage, axial asymmetry of the volumetric heat release), gaps between the pallets (and heat release peaking in fuel near the gap), chambers in the pallets. As a result of these deviations actual fuel rod parameters of working ability - temperature, stresses, thermal fluxes relieved from the cladding, geometry changes - in some locations can greatly vary from the ones calculated according to CCC model. The influence of these deviations is extremely important while calculating the fuel rod, because they are a part of the mechanical excess coefficient. The author reviews the influence of these factors using specific examples. He applies his own two-dimensional codes based on the Finite Elements Method for calculations of temperature fields, stresses and deformation in the fuel rod elements. It is shown that consideration of these deviations, as a rule, leads to  More>>
Authors:
Scheglov, A [1] 
  1. Russian Research Centre Kurchatov Inst., Moscow (Russian Federation)
Publication Date:
Dec 31, 1994
Product Type:
Miscellaneous
Report Number:
INIS-BG-0012; CONF-9409463-
Reference Number:
SCA: 210200; PA: AIX-28:031109; EDB-97:054343; SN: 97001765472
Resource Relation:
Conference: International seminar on WWER reactor fuel performance, modelling and experimental support, Varna (Bulgaria), 7-11 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of WWER reactor fuel performance, modelling and experimental support. Proceedings; Stefanova, S.; Chantoin, P.; Kolev, I. [eds.]; PB: 272 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; FUEL RODS; FUEL-CLADDING INTERACTIONS; ASYMMETRY; AXIAL SYMMETRY; DEFORMATION; FINITE ELEMENT METHOD; FUEL PELLETS; TEMPERATURE DEPENDENCE; THEORETICAL DATA; WWER TYPE REACTORS
OSTI ID:
456084
Research Organizations:
Bylgarska Akademiya na Naukite, Sofia (Bulgaria). Inst. za Yadrena Izsledvaniya i Yadrena Energetika
Country of Origin:
Bulgaria
Language:
English
Other Identifying Numbers:
Other: ON: DE97620150; TRN: BG9600366031109
Availability:
INIS; OSTI as DE97620150
Submitting Site:
INIS
Size:
pp. 115-118
Announcement Date:

Citation Formats

Scheglov, A. Influence of fuel-cladding system deviations from the model of continuous cylinders on the parameters of WWER fuel element working ability. Bulgaria: N. p., 1994. Web.
Scheglov, A. Influence of fuel-cladding system deviations from the model of continuous cylinders on the parameters of WWER fuel element working ability. Bulgaria.
Scheglov, A. 1994. "Influence of fuel-cladding system deviations from the model of continuous cylinders on the parameters of WWER fuel element working ability." Bulgaria.
@misc{etde_456084,
title = {Influence of fuel-cladding system deviations from the model of continuous cylinders on the parameters of WWER fuel element working ability}
author = {Scheglov, A}
abstractNote = {In the programs of fuel rod computation, fuel and cladding are usually presented in the form of coaxial cylinders, which can change their sizes, mechanical and thermal-physical properties. The real fuel element has some typical deviations from this continuous coaxial cylinders (CCC) model as: axial asymmetry of fuel-cladding system (due to the oval form of the cladding, cracking and other type of fuel pallet damage, axial asymmetry of the volumetric heat release), gaps between the pallets (and heat release peaking in fuel near the gap), chambers in the pallets. As a result of these deviations actual fuel rod parameters of working ability - temperature, stresses, thermal fluxes relieved from the cladding, geometry changes - in some locations can greatly vary from the ones calculated according to CCC model. The influence of these deviations is extremely important while calculating the fuel rod, because they are a part of the mechanical excess coefficient. The author reviews the influence of these factors using specific examples. He applies his own two-dimensional codes based on the Finite Elements Method for calculations of temperature fields, stresses and deformation in the fuel rod elements. It is shown that consideration of these deviations, as a rule, leads to the increase of the maximum fuel temperature in the WWER pellets (characterized by a large central hole), temperature of the cladding, thermal flux, relieved by the coolant from the cladding, and stresses in the cladding. It is necessary to consider these factors for both validation of the fuel element working ability and interpretation of the experimental results. 4 tabs., 3 figs., 5 refs.}
place = {Bulgaria}
year = {1994}
month = {Dec}
}