Document: NRC Regulatory Guide
Document ID: 626cd346-6298-4966-a92d-c5d4b24bbc2b
Document Type: regulatory_guide
Title: Overhead Crane Handling Systems for Nuclear Power Plants
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1303/ML13038A096.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.104
CFR Part: 
CFR Title: 

Content:
izer is used. The fleet angles between individual sheaves for rope should not exceed 1-½ degrees. Equalizers may be of the beam or sheave type or combinations thereof. For the recommended 6 x 37 IWRC classification wire rope,•the pitch diameter of the lead sheave should be 30-times the rope diameter foi the 180-degree reverse bend, 26 times the rope diameter for running sheaves and drum, with 13 times the rope diameter for equalizers. The pitch diameter is measured from the center of the rope on the drum or sheave groove through the center of the drum or sheave to the center of the rope on the opposite side. The dual reeving system may be a single rope from each end of a drum terminating at one of the blocks or equalizer with pro- visions for equalizing'beam type load and rope stretch, with each rope designed for the total load, or a 2-rope system may be used from each drum or separate drums using a sheave equalizer or beam equalizer, or any other combination which provides two separate and complete reeving systems. g. The portions of the vertical hoisting system components, which include the head block, rope reeving system, load block, and dual load-attaching device, should each be designed to sustain a test load of 200% of the design rated load. Each reeving system and each one -of the load-attaching devices should be assembled with approximately a 6-inch clearance between head and load blocks and should support 200% of the design rated load without permanent deformation other than localized strain concentration or localized degradation of the com- ponents. A 200% static-type load test should be per- formed for each reeving system and a load-attaching point at the manufacturer's plant. Measurements of the geometric configuration of the attaching points should be made before and after the test and should be fol- lowed by a nondestructive examination that should con- sist of combinations of magnetic particle, ultrasonic, radiograph, and dye penetrant examinations