Document: NUREG-0800
Document ID: 26aca061-b0de-4983-bbca-3fccb00afc2f
Document Type: srp
Title: PRESSURE-TEMPERATURE LIMITS AND PRESSURIZED THERMAL SHOCK1
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070431.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.2
CFR Part: 
CFR Title: 

Content:
n transverse specimens may be estimated by 110 one of the following criteria: (a) Test results from longitudinally-oriented specimens reduced to 65% of their value to provide conservative estimates of values expected from transversely oriented specimens. (b) Temperatures at which 68 J (50 ft-lbs) and 0.89 mm (35 mils) 111 112 LE were obtained on longitudinally-oriented specimens increased 11 C (20 F) to provide a conservative estimate of the 113 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 41 J (30 ft-lbs) was obtained, that temperature may 114 be used as an estimate of the RT provided that at least 61 J (45 ft-lbs) NDT 115 was obtained if the specimens were longitudinally oriented. If the minimum value obtained was less than 61 J (45 ft-lbs) , the RT may 116 NDT be estimated as 11 C (20 F) above the test temperature. 117 5.3.2-21 DRAFT Rev. 2 - April 1996 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 102 J (75 ft-lbs) for vessels with an estimated 118 end-of-life neutron fluence (> 1 MeV) of 1x10 and over. A value of 119 19 95 J (70 ft-lbs) is considered adequate for material for vessels that will be 120 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. If tests were only made on longitudinal specimens, the values should be reduced to 65% of the longitudinal values to estimate the transverse properties. The predicted end-of-life Charpy upper shelf energy and adjusted reference temperature for the reactor vessel materials must meet the requirements of 10 CFR 50, Appendix G, paragraph