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:
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 materials properties, including descriptions of the procedures used to minimize flaws and improve fracture toughness, are reviewed to establish that sufficient information is provided to evaluation the adequacy of the low-pressure rotor materials. Included in this information are: A. A discussion of the ductile-brittle transition temperatures (fracture appearance transition temperature of nil-ductility transition temperature) of the materials and the tests and standards used to determine them. B. The Charpy V-notch test program used to establish minimum upper-shelf energies of the rotor materials. C. The fracture toughness test program used to establish minimum upper-shelf toughness of the rotor materials. 2. Fracture Toughness. The fracture toughness of the materials and the materials tests or correlations of Charpy and tensile data to toughness properties are reviewed to establish that the turbine rotor materials exhibit adequate fracture toughness at normal operating temperature and during startup. 3. Pre-service Inspection. The pre-service inspection program information is reviewed to verify: A. the rotor forgings are first machined with minimum excess stock prior to heat treatment; B. visual and surface inspections are performed on all finished machined surfaces; C. a 100% volumetric (ultrasonic) examination is performed; D. before welding and/or brazing, all surfaces prepared for welding will be surface examined; E. after welding and/or brazing, all surfaces exposed to steam will be surface examined, giving particular attention to stress risers and welds; F. welds will be ultrasonically examined in the radial and radial-tangential sound beam directions. 4. Turbine Rotor Design. The low-pressure turbine rotor design information, including allowable stresses,