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:
disks from the shaft.27 5. Inservice Inspection The applicant's inservice inspection program is acceptable if in compliance with the following criteria: The inservice inspection program for the steam turbine assembly should provide assurance that diskrotor flaws that might lead to brittle failure of a diskrotor at speeds up to design speed will be detected. The inservice inspection and maintenance program for the turbine assembly should include the following:comply with the manufacturers recommendations. Disassembly of the turbine at approximately 10-year intervals,Inservice inspection and maintenance activities may be performed during plant shutdown coinciding with the inservice inspection schedule as required by ASME Boiler and Pressure Vessel Code, DRAFT Rev. 2 - April 1996 10.2.3-6 Section XI, and should include complete inspection of all normally inaccessible parts, 28 such as couplings, coupling bolts, turbine shafts, low-pressure turbine blades, low-pressure diskrotors, and high-pressure rotors. This inspection should consist of visual, surface, and volumetric examinations, as required. Technical Rationale29 The technical rationale for application of these acceptance criteria to reviewing turbine rotor integrity is discussed in the following paragraphs:30 Compliance with GDC 4 requires in part that structures, systems, and components important to safety be designed to accommodate the effects of, and be compatible with, environmental conditions associated with normal operations, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. These structures, systems, and components shall be appropriately protected against dynamic effects, including missiles caused by equipment failures. GDC 4 applies to this SRP section because the turbine is a potential source of high-energy missiles that could compromise the function of plant components designated as important to safety. Protection from these missiles is provided by placing specific