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R6 Revision 4 Amendment 2
12/24/03
‘R’ Procedures
Structural integrity assessment procedures
have been developed and used within the U.K. power generation
industry for more than twenty years. The procedures are
recognised internationally and are known as R5 and R6.
These procedures incorporate extensive experience in fracture
mechanics, finite element analysis and testing methods
but are being continuously developed to account for advances
in the understanding of fracture mechanics and the behaviour
of engineering materials and structures.
International research and experimental
programmes continue to provide new information, which is
used as a basis to extend and support both procedures.
R6 Assessment of the integrity of
structures containing defects
R6 is
an established, validated procedure for assessing the integrity
of structurescontaining defects against failure under operational
or fault loads where creep is not significant. Both mechanical
and thermal or other residual loads can be handled and
safety margins established.
The latest release of this Procedure is R6
Revision 4 which together with two amendments has now
been issued.
Features of R6 include:
- Simple 2-parameter graphical approach
on a Failure Assessment Diagram
- Choice of assessment options - leading
to more complex analysis only when necessary
- Minimal data requirements
- Easy to follow procedure with clear
instructions
- Modular structure for easy development
- Safety factors can be calculated......not
hidden in procedure
- ‘Safety first’ philosophy
leads to conservative results
- Widely used, accepted and validated
procedure
For more information, contact Graham
Marshall at: Graham.Marshall@British-Energy.com
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