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:
and the methods of application are contained in individual sections of the referenced SRP sectionChapter . 11 II. ACCEPTANCE CRITERIA The MTEBEMCB acceptance criteria are based on meeting the relevant requirements of the 12 following regulations: A. General Design Criterion 1 and 10 CFR Part 50, §50.55a(a)(1), as they relate to pump flywheel design, materials selection, fracture toughness, preservice and inservice inspection programs, and overspeed test procedures to determine their adequacy to assure a quality product commensurate with the importance of the safety function to be performed. B. General Design Criterion 4, as it relates to protecting safety-related structures, systems, and components of nuclear power plants from the effects of missiles that might result from reactor coolant pump failure. The following regulatory guide provides positions acceptable to the staff in meeting the requirements listed above: Regulatory Guide 1.14 which describes a method of minimizing the potential for failures of the flywheels of reactor coolant pump motors in light-water-cooled power reactors.13 Specific criteria necessary to meet the relevant requirements of GDC 1 and 4 and 10 CFR Part 50, 50.55a(a)(1) are as follows: 14 1. Materials Selection The applicant's selection of flywheel material is acceptable if it is in accordance with the following criteria: The flywheel material must be produced by a process (such as vacuum melting or degassing) that minimizes flaws in the material and improves its fracture toughness properties. The material must be examined and tested to meet the following criteria: a. The nil-ductility transition (NDT) temperature of the flywheel material, as obtained from dropweight tests (DWT) performed in accordance with the specification ASTM E-208 (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