Document: NUREG-0800
Document ID: a981ccac-57b3-4732-a32e-c75326443ef0
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600398.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
al should be left on the outer and bore radii for machining to final dimensions. 2. Fracture Toughness. The pump flywheel fracture toughness properties are acceptable if they comply with the following criteria, which are derived from Subsection C.1.b and supplemented by Subsection B of RG 1.14 and the ASME Boiler and Pressure Vessel Code (ASME Code), Section III, Appendix G, Protection Against Nonductile Failure. The material should be examined and tested to establish its fracture toughness property. The minimum KIC of the material at the normal operating temperature of the flywheel should be 165 MPa /m (150 ksi /in). Use of the direct test method to obtain KIC is encouraged. Direct Test. The plane-strain fracture toughness, KIC, should be obtained in accordance with ASTM E 399-05 if linear elastic fracture mechanics is used in the fracture mechanics analysis. The J-resistance curve should be obtained in accordance with ASTM E 1820-05a if elastic-plastic fracture mechanics is used. Either test should be conducted at or below the operating temperature of the pump flywheel. 5.4.1.1-5 Revision 2 - March 2007 Indirect Tests for Certain Steel. For flywheel materials made of ASME SA-533-B Class 1, ASME SA-508 Class 2, ASME SA-508 Class 3, and ASME SA-516 Grade 65 steel, the fracture toughness values can be found in the ASME Code, Section XI, Appendix A as a function of the difference between operating temperature (T) and the RTNDT of the flywheel material, i.e., T-RTNDT . The RTNDT of the flywheel material should be determined in accordance with NB-2320 and NB-2330 of the ASME Code, Section III based on the nil-ductility transition temperature (TNDT) determined by dropweight tests (DWT) and the impact energy determined by Charpy V-notch (C v) tests. NB-2320 specifies ASTM E-208-95a as the Standard for DWT tests and ASTM A-370 as the Standard for Cv tests. If this indirect approach is applied to flywheel materials other than ASME SA-533-B Class 1, ASME SA-508 Class 2, ASME