Document: NUREG-0800
Document ID: c9c204f0-a162-491c-8c25-ee0418212f29
Document Type: srp
Title: PRESSURE-TEMPERATURE LIMITS, UPPER-SHELF ENERGY, AND PRESSURIZED
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380185.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.2
CFR Part: 
CFR Title: 

Content:
ritic materials in the RCPB will comply with the requirements of Appendix G to 10 CFR Part 50, as detailed in Section XI of the ASME 5.3.2-9 Revision 2 - March 2007 Code, and that the materials in the beltline region of the reactor vessel will comply with the requirements of 10 CFR 50.61 (PWRs only) and the guidance of Regulatory Guide 1.99. 2. Operating License/Combined License Reviews. The plant technical specifications or pressure-temperature limits report should show the P-T limits using real temperature. The staff will review these curves and their bases to determine acceptability in the following areas: A. The limiting RTNDT has been properly determined and radiation effects are included in an acceptable manner. B. Limits are shown for all required conditions and provide all required information. C. The limits proposed are consistent with the acceptance criteria described in Section II above. 3. Acceptability Determination Methods A. Pressure-Temperature Limits. The reviewer will perform an independent evaluation of one or more proposed P-T limit curves. The reviewer will base this evaluation on the methodology for constructing P-T limit curves found in Appendix G to Section XI of the most recent edition and addenda of the ASME Code that 10 CFR 50.55a has endorsed. The reviewer will also apply the additional minimum temperature requirements specified in Appendix G to 10 CFR Part 50. For checking any P-T limit curve, the following steps describe the general form of the staff’s evaluation. i. Verify what each axis of the P-T limit plot represents. “Temperature,” normally given on the horizontal axis, may be either the reactor coolant system fluid temperature (most common) or the metal temperature of the vessel. “Pressure,” normally given on the vertical axis, is the system pressure but may be given in absolute or gauge values. The reviewer should also check to see whether the curves include pressure and/or temperature measurement uncertainties have