Document: NUREG-0800
Document ID: 967102fd-cb63-4897-b488-1358be1b2640
Document Type: srp
Title: TURBINE DISK INTEGRITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350072.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2.3
CFR Part: 
CFR Title: 

Content:
h the ultrasonic inspections and the accep- tance criteria in the SAR agree with ASME Boiler and Pressure Vessel Code, Section III, NB-2530 for plate materials or NB-2540 for forgings, is reviewed. 4. Turbine Disk Design The design and stress analysis procedures used for the low-pressure turbine disks are reviewed including the following areas: a. Load combinations at normal operating speed and allowable stresses. b. Design overspeed and basis for selection of design overspeed. C. Load combinations at design overspeed and allowable stresses. The SAR data are compared and evaluated against subsection II.4 of this SRP section. 5. Inservice Inspection The inservice inspection program described by the applicant, including areas to be inspected, methods of inspection, frequency of inspection, and acceptance criteria, is reviewed and compared with the requirements of subsection II.5 of this SRP section. IV. EVALUATION FINDINGS The staff concludes that the integrity of the turbine disk is acceptable and meets the relevant requirements of General Design Criterion 4 of 10 CFR Part 50. This conclusion is based upon the following: The applicant has met the requirements of General Design Criterion 4 of 10 CFR Part 50 with respect to the use of materials with acceptable fracture toughness and elevated temperature properties, adequate design, and the requirements for preservice and inservice inspections. The applicant has described his program for assuring the integrity of low-pressure turbine disks by the use of suitable materials of adequate fracture toughness, conservative design practices, and preservice and inservice inspections. The staff concurs that these provisions provide reasonable assurance that the probability of failure with missile generation is low during normal operation, including transients up to design overspeed. V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plan for using this SRP