Document: NUREG-0800
Document ID: e2737d9a-8e56-46cb-a97d-aaf62a442c6c
Document Type: srp
Title: PRESSURE-TEMPERATURE LIMITS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340637.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.2
CFR Part: 
CFR Title: 

Content:
l surveillance program described in Appendix H of 10 CFR Part 50. d. The Code specifies the stress components that must be used for the KI calculations, and the factors that must be applied to each to 5.3.2-3 Rev. 1 - July 1981 provide adequate safety margins. The Code, by reference to WRC-175, specifies the expression to use for calculating the KI, using the applied stresses and the postulated flaw geometry. Although calcu- lations are usually made by a computer, curves are provided in the Code to facilitate the use of conservative hand calculations if desired. 3. Pressure-Temperature Requirements The requirements for the pressure-temperature limits are as follows: a. Pressure-Temperature Limits for Prdtservice Hydrostatic Tests During preservice hydrostatic tests (if fuel is not in the vessel), the KIR must be greater than the KI caused by pressure. The expression used is: KI = KI(pressure) < KIR b. Pressure-Temperature Limits for Inservice Leak and Hydrostatic Tests During performance of inservice leak and hydrostatic tests, the KIR must be greater than 1.5 times the KI caused by pressure. The expression used is: KI = 1.5 KY(pressure) < KIR c. Pressure-Temperature Limits for Heatup and Cooldown Operations At all times during heatup and cooldown operations, the KIR must be greater than the sum of 2 times the K1 caused by pressure and the K1 caused by thermal gradients. The expression used is: KI = 2KY(pressure) + Ki(thermal) < KIR d. Pressure-Temperature Limits for Core Operation At all times that the reactor core is critical (except for low power physics tests) the temperature must be higher than that required for inservice hydrostatic testing, and in addition, the pressure-temperature relationship shall provide at least a 400F margin over that required for heatup and cooldown operations. III. REVIEW PROCEDURES The reviewer will select and emphasize material from the procedures described below, as may be appropriate for a particular case. 1. Preliminary Safety