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:
om longitudinally-oriented specimens reduced to 65% of their value to provide conservative estimates of values expected from transversely oriented specimens. (b) Temperatures at which 50 ft-lbs and 35 mils LE were obtained on longitudinally-oriented specimens increased 20'F to provide a conservative estimate of the temperature that would have been required to obtain the same values on transversely-oriented specimens. (4) If limited Charpy V-notch tests were performed at a single temperature to confirm that at least 30 ft-lbs was obtained, that temperature may be used as an estimate of the RTNDT pro- vided that at least 45 ft-lbs was obtained if the specimens were longitudinally oriented. If the minimum value obtained was less than 45 ft-lbs, the RTNDT may be estimated as 200F above the test temperature. 1.2 Estimation of Charpy V Upper-Shelf Energies For the beltline region of reactor vessels, the upper shelf toughness must be adequate to accommodate degradation by neutron radiation. The original minimum shelf energy must be 75 ft-lbs for vessels with an estimated end of life neutron fluence (> 1 MeV) of 1 x 1010 and over. A value of 70 ft-lbs is considered adequate for material for vessels that will be subjected to lower fluences. If upper-shelf Charpy energy values were not obtained, conservative estimates should be made using results of tests on specimens from the first surveillance capsule removed. 5.3.2-14 Rev. 1 - July 1981 If tests were only made on longitudinal specimens, the values should be reduced to 65% of the longitudinal values to estimate the transverse properties. 1.3 Reporting Requirements Fracture toughness information required by the Code and by Appendix G, 10 CFR Part 50, must be reported in the FSAR to provide a basis for. evaluating the adequacy of the operating limitations given in the Technical Specifications. In the case of older plants, the data may be estimated, using the procedures listed above, or other methods that can be shown to be