Document: NUREG-0800
Document ID: 967102fd-cb63-4897-b488-1358be1b2640
Document Type: srp
Title: TURBINE DISK INTEGRITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350072.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2.3
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Content:
REVIEW RESPONSIBILITIES Primary - Materials Engineering Branch (MTEB) Secondary - None I. AREAS OF REVIEW General Design Criterion 4 requires that structures, systems, and components important to safety shall be appropriately protected against environmental and dynamic effects, including the effects of missiles, that may result from equipment failure. Because turbine disks have large masses and rotate at relatively high speeds during normal reactor operation, failure of a disk may result in the genera- tion of high energy missiles and cause excessive vibration of the turbine rotor assembly. Measures taken by the applicant to assure turbine disk integrity and reduce the probability of turbine disk failure satisfy the relevant requirements of General Design Criterion 4. The purpose of this section of the SRP is to review and evaluate the information submitted by the applicant to assure turbine disk integrity and a low probability of turbine disk failure with the generation of missiles. The following areas of the applicantts safety analysis report (SAR) relating to turbine disk integrity are reviewed: 1. Materials Selection The low-pressure turbine rotor assembly usually consists of a rotor shaft with shrunk-on disks. Low-pressure disk stresses are due to thermal gradients, the interference fit, and centrifugal forces. These stresses are relatively high. The low-pressure turbine operates at lower temperatures than the high-pressure turbine. Thus, it is particularly important that low-pressure disks be made of a tough material. The use of suitable design, materials, and inservice inspection can greatly reduce the probability of a turbine disk failure. Rev. 1 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to