Document: NUREG-0800
Document ID: 9756acc3-3645-4542-87b2-dba98ae1d5d5
Document Type: srp
Title: TURBINE ROTOR INTEGRITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190015.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2.3
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of materials engineering issues related to flaw evaluation and welding Secondary - None I. AREAS OF REVIEW General Design Criterion 4 (GDC 4), "Environmental and Missile Dynamic Effects Design Bases," of Appendix A to 10 CFR Part 50 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 rotors have large masses and rotate at relatively high speeds during normal reactor operation, failure of a rotor may cause excessive vibration of the turbine rotor assembly and result in the generation of high energy missiles. Measures taken by the applicant to ensure turbine rotor integrity and reduce the probability of turbine rotor failure must satisfy the relevant requirements of GDC 4. The low-pressure turbine rotor assembly may consist of a rotor shaft with shrunk-on disks or a one-piece rotor using either an integral forging or welded design. Low-pressure rotor are subject to relatively high stresses caused by thermal gradients, the interference fit, and centrifugal forces. The low-pressure turbine operates at lower temperatures than the high-pressure turbine. Thus, it is particularly important that low-pressure rotor be made of a tough material. The use of suitable design, materials, fabrication techniques, coating 10.2.3-2 Revision 2 - March 2007 processes, and nondestructive examinations during the fabrication process, and inservice inspection can greatly reduce the probability of a turbine rotor failure. The purpose of this section of the Standard Review Plan (SRP) is to review and evaluate the information submitted by the applicant to ensure turbine rotor integrity and a low probability of turbine rotor failure with the generation of missiles. The specific areas of review are as follows: 1. Materials Selection. The