Document: NUREG-0800
Document ID: 8d8c874b-f1ef-4884-8228-654f526c0ce4
Document Type: srp
Title: PUMP FLYWHEEL INTEGRITY (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070445.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.1.1
CFR Part: 
CFR Title: 

Content:
Reference. 35 ), should be no higher than -12.5 C 15 16 (10 F) . 17 DRAFT Rev. 2 - April 1996 5.4.1.1-4 b. The Charpy V-notch (C ) upper-shelf energy level in the "weak" direction (WR v orientation in plates) of the flywheel material should be at least 68 N·m (50 ft-lbs) . A minimum of three C specimens should be tested from each plate or 18 v forging, in accordance with ASTM A-370 (Reference. 46 ). 19 20 2. Fracture Toughness The following fracture toughness criteria are derived from Regulatory Guide 1.14, C.1.c, and the ASME Boiler and Pressure Vessel Code (hereafter "the Code"), Section III, Appendix G, Protection Against Nonductile Failure (Reference 4) . The pump 21 22 flywheel fracture toughness properties are acceptable if they are in compliance with the following criteria: The minimum static fracture toughness of the material at the normal operating temperature of the flywheel should be equivalent to a reference stress intensity factor (K ) critical stress intensity factor, K , of at least 165 MPa m (150 ksi in) . Ir Ic 23 24 Compliance can be demonstrated by either of the following: a. Testing of the actual material to establish the K K value at the normal Ic Ir 25 operating temperature. b. Determining that the normal operating temperature is at least 56 C (100 F)26 above the RT . NDT 3. Preservice Inspection The following preservice inspection criteria are derived from Regulatory Guide 1.14, C.1.d, C.1.e, and C.1.fC.4.a. The applicant's preservice inspection program including 27 finish machining and ultrasonic and surface inspections is acceptable if in compliance with the following criteria: a. Each finished flywheel should be subjected to a 100% volumetric examination by ultrasonic methods using procedures and acceptance criteria specified in Code Section III, NB-2530 for plates, and NB-2540 for forgings. b. If the flywheel is flame cut from a plate or forging, at least 1.3 cm (1/2 inch) of 28 material should be left on the outer and bore radii for