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Developments in the Flaw Assessment Procedures of R6 Revision 4 and BS7910

[+] Author Affiliations
R. A. Ainsworth, P. J. Budden

British Energy Generation, Ltd., Gloucester, UK

A. R. Dowling

BNFL Magnox Generation, Berkeley, UK

J. K. Sharples

Serco Assurance, Warrington, UK

Paper No. PVP2003-2023, pp. 19-25; 7 pages
  • ASME 2003 Pressure Vessels and Piping Conference
  • Flaw Evaluation, Service Experience, and Reliability
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4154-5
  • Copyright © 2003 by ASME


The British Standards flaw assessment procedure BS7910 was issued in 1999 and combined and updated the previous published documents PD6493 and PD6539 for components operating at temperatures where creep was negligible and important, respectively. A major revision, Revision 4, of the R6 defect assessment procedures was released about a year later. Both BS7910 and R6 are under active development. This paper describes updates to the BS7910 and R6 Revision 4 documents since they were first issued. Ongoing developments which will lead to future revisions to the documents are also described.

Copyright © 2003 by ASME
Topics: Creep , Temperature



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