Document: NRC Regulatory Guide
Document ID: cf64153e-7623-469c-a3f9-b57ba0f5497d
Document Type: regulatory_guide
Title: Reactor Coolant Pump Flywheel Integrity + HISTORY - HISTORY 01/2006 – Periodic Review of Revision 1 – No Issues Identified
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003739936.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.14
CFR Part: 
CFR Title: 

Content:
tion.7 d. An analysis should be conducted to predict the critical speed for nonductile fracture of the flywheel. Justification should be given for the stress analysis method, the estimate of flaw size and location, which should take into account initial size and flaw growth in service, and the values of fracture toughness assumed for the material. The analysis should be submitted to the NRC staff for evaluation.3 e. An analysis should be conducted to predict the critical speed for excessive4 deformation of the fly wheel. The analysis should be submitted to the NRC staff for evaluation.3 f. The normal speed should be less than one-half of the lowest of the critical speeds calculated in regulatory positions C.2.c, d, and e above. g. The predicted LOCA overspeed should be less than the lowest of the critical speeds calculated in regulatory positions C.2.c., d, and e. 3. Testing Each flywheel assembly should be spin tested at the design speed of the flywheel. 4. Inspection a. Following the spin test described in regulatory position C.3, each finished flywheel should receive a check of critical dimensions and a nondestructive exam ination as follows: (1) Areas of higher stress concentrations, e.g. bores, keyways, splines, and drilled holes, and surfaces adjacent to these areas on the finished flywheel should be examined for surface defects in accordance with paragraph NB-2545 or NB-2546 of Section III of the ASME Code using the procedures of paragraph NB-2540. No linear indications more than 1.6 mm (1/16 inch) long, other than laminations, should be permitted. (2) Each finished flywheel should be subjected to a 100% volumetric examination by ultrasonic meth ods using procedures and acceptance criteria specified in paragraph NB-2530 (for plates) or paragraph NB-2540 (for forgings) of Section III of the ASME Code. 'The analyses outlined in regulatory positions C.2.c, d, and e should preferably be submitted in topical reports rather than on a case-by-case basis for those