Document: NUREG-0800
Document ID: ba716f3a-da21-413e-a855-dc0255b76522
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100680157.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
tangential stress at speeds from normal to design overspeed should be at least 2 /in (consistent with SRP Section 10.2.3, ATurbine Disk Integrity@), or alternatively, the ratio of KIC to the applied K should be 3.16 for normal and upset conditions and 1.41 for emergency and faulted conditions (consistent with the ASME Code approach). This fracture mechanics analysis should consider crack growth due to identified degradation mechanisms for the largest flaw which could be missed by inspection (use the NRC accepted value of 0.25 inch for Westinghouse Owners Group [WOG] and ABB Combustion Engineering Owners Group [CEOG] flywheels if a smaller value can not be justified). The analysis should be submitted as a topical report to the NRC staff for evaluation. 5. Overspeed Test. The applicant's commitment to perform an overspeed test is acceptable if each flywheel assembly is tested at the design overspeed of the flywheel. This criterion is taken from Subsection C.3 of RG 1.14. 6. Inservice Inspection (ISI). The applicant's ISI program is acceptable if it complies with the following criteria, which are derived from Subsection C.4.b of RG 1.14, operating experience, and staff=s evaluation of WOG=s and CEOG=s fracture mechanics analyses on reactor coolant pump flywheels of operating plants. A. A volumetric examination by ultrasonic methods of the areas of higher stress concentration at the bore and keyway extending to half of the flywheel radius, or a surface examination by liquid penetrant or magnetic particle methods of all exposed 5.4.1.1-7 Revision 3 - May 2010 surfaces, at approximately 10 operating year intervals, during the refueling or maintenance shutdown coinciding with the inservice inspection schedule as required by the ASME Code, Section XI. Removal of the flywheel is not required. B. Examination procedures and acceptance criteria should be in conformance with the requirements specified in Subsection II.3.A of this SRP section. 7. Operational Programs. For COL