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:
l 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 been included in the curves. If so, these must be removed before the evaluation outlined below will give comparable results. ii. Determine the reference temperature (RTNDT) at the 1/4 thickness (1/4 T) and 3/4 T locations for each vessel beltline material. For preservice hydrostatic testing curves, this determination shall be based on the initial material properties for each material determined in accordance with ASME Code, Section III, NB-2331 or BTP 5-3. 5.3.2-10 Revision 2 - March 2007 For all other curves (inservice leak/hydrostatic testing, heatup, cooldown, core critical operation), a period of applicability should be specified, usually in effective full-power years (EFPYs) of operation. This should be specified, along with the 1/4 T and 3/4 T neutron fluence (E > 1.0 MeV) at the EFPY value for each beltline material, to account for the effects of radiation on the material properties of each beltline material. The RTNDT values at the 1/4 T and 3/4 T locations for each beltline material through the end of the specified period of applicability should be determined in accordance with Regulatory Guide 1.99. iii. The following fundamental equation should be satisfied at each P-T point along any P-T limit curve: KI applied = KIc where: KI applied = The stress intensity due to pressure (membrane) and thermal gradient (bending) loads at the tip of the 1/4 T defect postulated in Appendix G to Section XI of the ASME Code. KIc = The lower bound, plane strain, crack initiation fracture toughness for the material as represented in Figure 1. iv. KI applied shall be calculated from an equation of the general form: KI applied = SF * Mm * (p * Ri / t) + KI thermal where: SF = A structural factor applied to the pressure loading as specified in Appendix G to Section XI of the ASME