Document: NUREG-0800
Document ID: 8d8c874b-f1ef-4884-8228-654f526c0ce4
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070445.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
ion 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 28 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. 4. Flywheel Design The following flywheel design criteria are derived from Regulatory Guide 1.14, C.2. The applicant's flywheel design is acceptable if in compliance with the following criteria: 5.4.1.1-5 DRAFT Rev. 2 - April 1996 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 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 specified yield strength or 1/3 of the measured yield strength in the weak direction of the material if appropriate tensile tests have been performed on the actual material of the flywheel. b. The design overspeed of a flywheel should be at least 10% above the highest anticipated overspeed. The anticipated overspeed should include consideration of the maximum rotational speed of the flywheel if a break occurs in the reactor coolant piping in either the suction or discharge side of the pump. TheAn acceptable basis for the assumed design overspeed, addressing pipe breaks consistent with the design basis for reactor coolant piping, should be submitted to the staff for review.29 c. The combined stresses at the design overspeed, due to centrifugal forces and the interference fit, should not exceed 2/3 of the minimum specified yield strength, or 2/3 of the measured yield strength in the weak direction if appropriate tensile tests have been performed on