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Modelling the behaviour of a control-element blade during irradiation
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics. (FSCN – Fibre Science and Communication Network)
1997 (English)In: Computers & Structures, 1997, Vol. 64, no 5/6, 1113-1127 p.Conference paper, (Refereed)
Abstract [en]

The control-rod elements in a boiling-water reactor contain natural boron carbide (B4C) powder, used as neutron-absorber material and clad in stainless-steel blades. During in-reactor service, the internal production of helium gas and point defects in neutron-irradiated boron carbide cause swelling which can induce significant contact stresses in the blade causing, eventually, stress-corrosion cracking of the blades. In this work, a finite-element analysis of a control-rod blade consisting of B4C powder and stainless-steel cladding has been performed using ADINA. An algorithm for the finite-element calculation of a porous material such as B4C powder has been developed and which models both swelling and consolidation behaviour of B4C powder. The Drucker-Prager constitutive law has been used to model the consolidation effect. The model has been verified with an analytical solution for a simple geometry. A number of cases with B4C powder in contact with stainless steel and using the actual blade design have been studied for which contact stresses, the displacements and the effective stresses are calculated. Finally, the model has been used to predict the deformation of the blade during irradiation under B4C swelling and irradiation-induced creep of stainless steel.

Place, publisher, year, edition, pages
1997. Vol. 64, no 5/6, 1113-1127 p.
Keyword [en]
Fracture mechanics
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-1529DOI: 10.1016/S0045-7949(97)00021-7Local ID: 1482OAI: oai:DiVA.org:miun-1529DiVA: diva2:26561
Available from: 2008-09-30 Created: 2008-09-30Bibliographically approved

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Citation style
  • apa
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