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:
REVIEW RESPONSIBILITIES Primary - Materials Engineering Branch (MTEB) Secondary - None I. AREAS OF REVIEW General Design Criterion 4 (Ref. 1) requires that structures, systems, and components of nuclear power plants important to safety be protected against the effects of missiles that might result from equipment failures. Because flywheels have large masses and rotate at speeds of 900 rpm or 1200 rpm during normal reactor operation, a loss of flywheel integrity could result in high energy missiles and excessive vibration of the reactor coolant pump assembly. The safety consequences could be significant because of possible damage to the reactor coolant system, the containment, or the engineered safety features. General Design Criterion 1 (Ref. 1) and 10 CFR Part 50, §50.55a(a)(1) require that structures, systems, and components important to safety shall be designed, fabricated, erected and tested to quality standards which shall be identified and evaluated to determine their adequacy to assure a quality product in keeping with the required safety function. The following areas relating to reactor coolant pump flywheel integrity are reviewed by MTEB: 1. Materials Selection Reactor coolant pump flywheels are of a simple geometric shape, and are made of ductile material. Their quality can be closely controlled and their service conditions are not severe; therefore, the use of suitable material, coupled with adequate design and inservice inspection can provide a suffi- ciently small probability of a flywheel failure that the consequences of failure need not be protected against. Rev. 1 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsibe for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commisslon's policy to inform the nuclear industry and the general public of regulatory procedures