Document: NUREG-0800
Document ID: a981ccac-57b3-4732-a32e-c75326443ef0
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600398.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
required to ensure that this review procedure is complete. The review procedure involves the following: 1. Materials Selection. The materials selection, including the procedures to minimize flaws and improve mechanical properties as described by the applicant, are reviewed and compared with the requirements of Subsection II.1 of this SRP section. If it is a new material not used in prior licensing cases, the materials selection is reviewed and evaluated to establish its acceptability. Based on past evaluations, the following materials are suitable for pump flywheels provided that they meet all the criteria listed in Subsections II.1 and II.2 of this SRP section: ASME SA-533-B Class 1, ASME SA-508 Class 2, ASME SA-508 Class 3, and ASME SA-516 Grade 65. The specification for each of these materials is provided in the ASME Code, Section II. 2. Fracture Toughness. The fracture toughness properties of the flywheel materials, including test data where applicable, are reviewed and compared with the requirements of Subsection II.2 of this SRP section. Two methods for deriving the fracture toughness of the flywheel materials are acceptable: 1) the direct method using fracture mechanics testing as described in Subsection II.2 of this SRP section, and 2) the indirect method using the RTNDT of the flywheel as described in Subsection II.2 of this SRP section for flywheel materials made of ASME SA-533-B Class 1, ASME SA-508 Class 2, ASME SA- 508 Class 3, or ASME SA-516 Grade 65 steel. The actual fracture toughness property or the nil-ductility reference temperature of the flywheel materials and the stated normal operating temperature of the flywheel should be consistent with those specified in the licensee’s SAR. 3. Preservice Inspection. The preservice inspection program, including finish machining and ultrasonic and surface inspections as described by the applicant, is reviewed and compared with the requirements of Subsection II.3 of this SRP section. The extent to which the