Document: NUREG-0800
Document ID: a4f5c92f-1c1f-4a9c-b4d4-cb2fcc282cae
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340666.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
examina- tion by ultrasonic methods at approximately ten-year intervals, during the plant shutdown coinciding with the inservice inspection schedule as required by the Code, Section XI. Removal of the flywheel is not required. c. A preservice baseline inspection incorporating all the procedures of a. and b. above, which should establish initial flywheel conditions, accessibility, and practicality of the program. d. Examination procedures and acceptance criteria should be in conformance with the requirements specified in subsection II.3.a of this SRP Section. III. REVIEW PROCEDURES The reviewer will select and emphasize material from the procedures described below, as may be appropriate for a particular case. For each area of review, the following review procedure is followed: 1. Materials Selection The materials selection, including the procedures to minimize flaws and improve mechanical properties 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 subsection II.1 and 11.2 of this SRP section: ASME SA-533-8 Class 1, ASME SA-508 Class 2, and ASME SA-516 Grade 65 (Ref. 2). 5.4.1.1-5 Rev. 1 - July 1981 2. Fracture Toughness The fracture toughness properties of the flywheel materials, including test data where applicable, are reviewed and compared with the require- ments of subsection II.2 of this SRP section. Two alternative methods for deriving the fracture toughness of the flywheel materials are acceptable. The value of the critical stress intensity factor is based on fracture mechanics testing, while the use of the reference temperature approach is based on the stated normal operating temperature of the flywheel and the actual