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PBMR Reactor Unit Seismic Response Including Impact Damping

[+] Author Affiliations
N. F. du Plooy

Pebble Bed Modular Reactor (Pty) Ltd., Centurion, South Africa

Paper No. PVP2008-61797, pp. 115-119; 5 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4831-9 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


The Pebble Bed Modular Reactor (PBMR) is a High Temperature Reactor (HTR), with a closed-cycle, gas turbine power conversion system. The PBMR essentially comprises a steel pressure vessel which holds the enriched uranium dioxide fuel encapsulated in graphite spheres. The fuel is supported by a graphite block reflector and a steel core barrel. It is clear that the Reactor Unit consists of parts with very different damping properties. Additionally a large number of gapped supports are used to satisfy the support requirements for both thermal and seismic load cases. In this paper a method to account for the energy dissipation through impact of the gapped supports is investigated. It is found that the inclusion of viscous impact damping results in significant reductions of the impact force.

Copyright © 2008 by ASME
Topics: Damping



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