Document: NUREG-0800
Document ID: 60504484-b86d-4048-bba0-59d150675db4
Document Type: srp
Title: TURBINE DISKROTOR  INTEGRITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070578.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2.3
CFR Part: 
CFR Title: 

Content:
1 REVIEW RESPONSIBILITIES Primary - Materials Engineering Branch (MTEB) Civil Engineering and Geosciences Branch (ECGB)2 Secondary - NoneMaterials and Chemical Engineering Branch (EMCB)3 I. AREAS OF REVIEW General Design Criterion 4 (GDC 4) requires that structures, systems, and components 4 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 diskrotors have large masses and rotate at relatively high speeds during normal reactor operation, failure of a diskrotor may result in the generation of high energy missiles and cause excessive vibration of the turbine rotor assembly. Measures taken by the applicant to assure ensure5 turbine diskrotor integrity and reduce the probability of turbine diskrotor failure satisfy the relevant requirements of General Design Criterion 4 GDC 4.6 The purpose of this section of the Standard Review Plan (SRP) is to review and evaluate the 7 information submitted by the applicant to assure ensure turbine diskrotor integrity and a low probability of turbine diskrotor failure with the generation of missiles. The following areas of the applicant's safety analysis report (SAR) relating to turbine diskrotor integrity are reviewed: 1. Materials Selection The low-pressure turbine rotor assembly usually may consists of a rotor shaft with shrunk-on disks or a one-piece rotor using either an integral forging or welded design. 8 DRAFT Rev. 2 - April 1996 10.2.3-2 Low-pressure diskrotor 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 diskrotors be made of a tough material. The use of suitable design, materials, fabrication techniques, coating processes, nondestructive examinations during the fabrication