1. R5, Assessment procedure for the high temperature response of structures, Issue 3, British Energy Generation Ltd., Gloucester, UK, 2003.
2. Procedure R6 Revision 4, Assessment of the integrity of structures containing defects, British Energy Generation Ltd, Gloucester, UK, 2004.
3. Guide on methods for assessing the acceptability of flaws in metallic structures,2005
4. Boiler and pressure vessel code,2004
5. API Recommended Practice 579, 1st ed., American Petroleum Institute, Washington, 2000.