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:
minimizing the potential for failures of the reactor coolant pump flywheels. During operation at normal speed, a flywheel has sufficient kinetic energy to potentially produce high-energy missiles and excessive vibration of the reactor coolant pump assembly if the flywheel should fail. Overspeed of the pump rotor assembly during a transient increases both the potential for failure and the kinetic energy of the flywheel. The safety consequences of flywheel failure could be significant because of possible damage to the reactor coolant system, the containment, or the engineered safety features. Application of this criterion ensures that there will be an extremely low probability of missiles from the flywheels resulting in consequences to the reactor coolant system pressure boundary, containment, and engineered safety features. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 5.4.1.1-8 Revision 2 - March 2007 The judgment on areas to be given attention and emphasis in the review is based on the review of the material presented to determine whether it is similar to that recently reviewed on other plants and whether items of special safety significance are involved. Upon request from the primary reviewer, the review interface organizations will provide input for the areas of review stated in Subsection I of this SRP section. The primary reviewer obtains and uses such input as 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