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:
08-95a as the Standard for DWT tests and ASTM A-370 as the Standard for Cv tests. If this indirect approach is applied to flywheel materials other than ASME SA-533-B Class 1, ASME SA-508 Class 2, ASME SA-508 Class 3, or ASME SA-516 Grade 65 steel, justification should be given to establish equivalence of fracture toughness between the proposed flywheel material and those mentioned here. 3. Preservice Inspection. The applicant's preservice inspection program, including finish machining and ultrasonic and surface inspections, is acceptable if it complies with the following criteria, which are derived from Subsection C.4.a of RG 1.14. A. Each finished flywheel should be subjected to a 100% volumetric examination by ultrasonic methods using procedures and acceptance criteria specified in ASME Code, Section III, NB-2530 for plates, and NB-2540 for forgings. B. If the flywheel is flame cut from a plate or forging, at least 1.3 cm (1/2 inch) of material should be left on the outer and bore radii for machining to final dimensions. C. Finish machined bores, keyways, splines, and drilled holes should be subjected to magnetic particle or liquid penetrant examination. D. The inspection results should be appropriately documented to establish initial flywheel conditions, accessibility, and practicality of the program to be used as baseline information for future inservice inspections. 4. Flywheel Design. The applicant's flywheel design is acceptable if it complies with the following criteria, which are derived from Subsection C.2 of RG 1.14. The flywheel should be designed to withstand normal conditions, anticipated transients, the design basis loss of coolant accident, and the safe shutdown earthquake without loss of structural integrity. The design of the pump flywheel should also meet the following criteria: A. The combined stresses at the normal operating speed due to centrifugal forces and the interference fit of the wheel on the shaft, should not exceed 1/3 of the minimum