Document: NUREG-0800
Document ID: 866c6ef6-2f4a-45c7-9e71-43e1f66a8422
Document Type: srp
Title: Draft Revision 3– July 2018
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1807/ML18071A066.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5
CFR Part: 
CFR Title: 

Content:
own conditions. (4) Maximum pressure-minimum temperature curves for core operation. 2.2 Recommended Bases for Operating Limitations 2.2.1 Leak and Hydrostatic Tests BTP 5-3-5 Draft Revision 3 – July 2018 (1) It is recommended that no tests at pressures higher than design pressure be conducted with fuel in the vessel. (2) For system and component hydrostatic tests performed prior to loading fuel in the reactor vessel, it is recommended that hydrostatic tests be performed at a temperature not lower than RTNDT plus 60 °F. (3) For system and component hydrostatic tests performed subsequent to loading fuel in the reactor vessel, the minimum test temperature should be determined as specified in Appendix G, 10 CFR Part 50. 2.2.2 Heatup and Cooldown Limit Curves Heatup and cooldown pressure-temperature limit curves may be determined using the method given in Appendix G of the ASME Code. The effect of thermal gradients may be conservatively approximated by the procedures in Appendix G of the ASME Code or from the report, Tabulation of thermally-Induced Stress Intensity Factors (KIT) and Crack Tip Temperatures for Generating P-T Curves per ASME Section XI-Appendix G, ORNL/NRC/LTR-03/03. Calculations need only be performed for the beltline region, if the RTNDT of the beltline is demonstrated to be adequately higher than the RTNDT for all higher stressed regions and if the nozzles are not limiting. Alternatively, more rigorous analytical procedures may be used, provided that the intent of the ASME Code is met, and adequate technical justification for all assumptions and bases is provided. 2.2.3 Core Operation Limits To provide added margins during actual core operation, Appendix G, 10 CFR Part 50 requires a minimum temperature during core operation, and a 22 °C (40 °F) margin in temperature over the pressure-temperature limits as determined for heatup and cooldown in 2.2.2 above. The minimum temperature, regardless of pressure, is the temperature calculated for the