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The prediction of the-circumferential fuel-temperature distribution under ballonian condition. Vol. 3

Abstract

Swelling and thermal distortion of nuclear fuel elements due to depressurization of reactor coolant may cause contracts in points or finite regions between adjacent fuel elements in square and triangle lattices. This is very probable in Advanced Pressurized Water Reactors where the clearance between fuel elements is about 1 mm. This results in partial blocking of the coolant flow and formation of hot spots in the contact regions. In these regions, absence of coolant results in nonuniform clad circumferential temperature distribution. This causes excessive thermal stresses which may produce local melting or clad failure. An accurate prediction of the clad circumferential temperature distribution during these severe incidents is very important. This problem was studied numerically during transient and steady state conditions. Recently, a semi analytical solution for the underlying problem was derived assuming the heat transfer coefficient to vary linearly with the circumferential distance measured from the cusp point, and the heat flux at the fuel-clad interface to be a constant quantity. In the present work, an approximate analytic solution is obtained. The accuracy is tested by solving the problem numerically. Also the problem is reanalyzed by considering the heat flux at the fuel-clad interface to be a power function  More>>
Authors:
Abdallah, A M; El-Sherbiny, E M [1] 
  1. Reactor Department, Nuclear Research Center, Atomic Energy Authority, Cairo (Egypt)
Publication Date:
Mar 01, 1996
Product Type:
Miscellaneous
Report Number:
INIS-EG-002; CONF-960316-
Reference Number:
SCA: 220300; PA: AIX-28:030930; EDB-97:054563; SN: 97001765403
Resource Relation:
Conference: 6. conference of nuclear sciences and applications, Cairo (Egypt), 15-20 Mar 1996; Other Information: PBD: Mar 1996; Related Information: Is Part Of Proceedings of the sixth conference of nuclear sciences and applications. Vol. 1-4; PB: 1760 p.
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; FUEL ELEMENTS; FORECASTING; REACTOR LATTICES; TEMPERATURE DISTRIBUTION; HEAT FLUX; REACTOR COOLING SYSTEMS; SWELLING; THEORETICAL DATA; WATER
OSTI ID:
456066
Research Organizations:
Atomic Energy Establishment, Cairo (Egypt); Egyptian Society of Nuclear Sciences and Applications, Cairo (Egypt)
Country of Origin:
Egypt
Language:
English
Other Identifying Numbers:
Other: ON: DE97620041; TRN: EG9601808030930
Availability:
INIS; OSTI as DE97620041
Submitting Site:
INIS
Size:
pp. 365
Announcement Date:

Citation Formats

Abdallah, A M, and El-Sherbiny, E M. The prediction of the-circumferential fuel-temperature distribution under ballonian condition. Vol. 3. Egypt: N. p., 1996. Web.
Abdallah, A M, & El-Sherbiny, E M. The prediction of the-circumferential fuel-temperature distribution under ballonian condition. Vol. 3. Egypt.
Abdallah, A M, and El-Sherbiny, E M. 1996. "The prediction of the-circumferential fuel-temperature distribution under ballonian condition. Vol. 3." Egypt.
@misc{etde_456066,
title = {The prediction of the-circumferential fuel-temperature distribution under ballonian condition. Vol. 3}
author = {Abdallah, A M, and El-Sherbiny, E M}
abstractNote = {Swelling and thermal distortion of nuclear fuel elements due to depressurization of reactor coolant may cause contracts in points or finite regions between adjacent fuel elements in square and triangle lattices. This is very probable in Advanced Pressurized Water Reactors where the clearance between fuel elements is about 1 mm. This results in partial blocking of the coolant flow and formation of hot spots in the contact regions. In these regions, absence of coolant results in nonuniform clad circumferential temperature distribution. This causes excessive thermal stresses which may produce local melting or clad failure. An accurate prediction of the clad circumferential temperature distribution during these severe incidents is very important. This problem was studied numerically during transient and steady state conditions. Recently, a semi analytical solution for the underlying problem was derived assuming the heat transfer coefficient to vary linearly with the circumferential distance measured from the cusp point, and the heat flux at the fuel-clad interface to be a constant quantity. In the present work, an approximate analytic solution is obtained. The accuracy is tested by solving the problem numerically. Also the problem is reanalyzed by considering the heat flux at the fuel-clad interface to be a power function of the angular distance along the clad surface. Moreover, the heat transfer coefficient is assumed to be a function of both the circumferential coordinate and temperature of the clad. Discussion of the analytical solution and the assumptions are rationalized in the text. 4 figs.}
place = {Egypt}
year = {1996}
month = {Mar}
}