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:
92 tests. Both drop weight nil-ductility transition temperature (NDTT) tests and 93 Charpy V-notch tests must be run to determine the RT . The NDTT NDT temperature, as determined by drop weight tests (ASTM E-208-1969 ) is the 94 95 RT if, at 33 C (60 F) above the NDTT, at least 68 J (50 ft-lbs) of energy NDT 96 97 and 0.89 mm (35 mils) lateral expansion (LE) are obtained in Charpy V- 98 99 notch tests on specimens oriented in the weak direction (transverse to the 100 101 direction of maximum working). DRAFT Rev. 2 - April 1996 5.3.2-20 In most cases, the fracture toughness testing performed on vessel material for older plants did not include all tests required to determine the RT in this NDT manner. Acceptable estimation methods for the most common cases, based on correlations of data from a large number of heats of vessel material, are provided below for guidance in determining RT when measured values are not NDT available . 102 (1) If dropweight tests were not performed, but full Charpy V-notch curves were obtained, the NDTT for SA-533 Grade B, Class 1 plate and weld material may be assumed to be the temperature at which 41 J (30 ft-lbs)103 was obtained in Charpy V-notch tests, or -18 C (0 F) , whichever was 104 higher. (2) If dropweight tests were not performed on SA-508, Class II forgings, the NDTT may be estimated as the lowest of the following temperatures: (a) 33 C (60 F) . 105 (b) The temperatures of the Charpy V-notch upper shelf. (c) The temperature at which 136 J (100 ft-lbs) was obtained on 106 Charpy V-notch tests if the upper-shelf energy values were above 136 J (100 ft-lbs) . 107 (3) If transversely-oriented Charpy V-notch specimens were not tested, the temperature at which 68 J (50 ft-lbs) and 0.89 mm (35 mils) LE 108 109 would have been obtained on 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