Heat Transfer Issues in Finite Element Analysis of Bounding Accidents in PPCS Models

Modelling of temperature excursions in structures of conceptual power plants during hypothetical worst-case accidents has been performed within the European Power Plant Conceptual Study (PPCS). A new, 3D finite elements (FE) based tool, coupling the different calculations to the same tokamak geometr...

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Bibliographic Details
Published in:Fusion science and technology 2005-05, Vol.47 (4), p.1003-1007
Main Authors: Pampin, R., Karditsas, P. J.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CRYOSTATS
FINITE ELEMENT METHOD
HEAT FLUX
HEAT TRANSFER
IRRADIATION
NEUTRON TRANSPORT
SURFACES
THERMAL ANALYSIS
THERMAL CONDUCTIVITY
THERMONUCLEAR POWER PLANTS
THERMONUCLEAR REACTOR MATERIALS
TOKAMAK DEVICES
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Summary:Modelling of temperature excursions in structures of conceptual power plants during hypothetical worst-case accidents has been performed within the European Power Plant Conceptual Study (PPCS). A new, 3D finite elements (FE) based tool, coupling the different calculations to the same tokamak geometry, has been extensively used to conduct the neutron transport, activation and thermal analyses for all PPCS plant models. During a total loss of cooling, the usual assumption for the bounding accident, passive removal of the decay heat from activated materials depends on conduction and radiation heat exchange between components. This paper presents and discusses results obtained during the PPCS bounding accident thermal analyses, examining the following issues: (a) radiation heat exchange between the inner surfaces of the tokamak, (b) the presence of air within the cryostat volume, and the heat flow arising from the circulation pattern provided by temperature differences between various parts, and (c) the thermal conductivity of pebble beds, and its degradation due to exposure to neutron irradiation, affecting the heat transfer capability and thermal response of a blanket based on these components.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST05-A819