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:
ad blocks should be de- signed to maintain a vertical load balance about the cen- ter of lift from load block through head block and have a reeving system of dual design. The loadblock should maintain alignment and a position of stability with either system being able to support 3W within the break- ing strength of the rope and maintain load stability and vertical aligrnment from center of head block through all hoisting components through the center of gravity of the load. 1.104-5 e. Design of the rope reeving systei(s) should be dual with each system providing separately the load balance on the head and load blocks through configura- tion of ropes and rope equalizer(s). Selection of the hoisting rope or running rope should include considera- tion of the size, construction, lay, and means or type of lubrication to maintain efficient working of the indivi- dual wire strands when each section of rope passes over the individual sheaves during the hoisting operation. The effects of impact loadings, acceleration, and emergency stops should be included in selection of rope and reeving systems. The wire rope should be 6 x 37 NWRC (iron wire rope core) or comparable classification. The lead line stress to the drum during hoisting (dynamic) at the maximum design speed with the design rated load should not exceed 20% of the manufacturer's published rated strength- Line speed during hoisting (raising or lowering) should not exceed 50 fpm. f. The maximum fleet angle from drum to lead sheave in the load block should not exceed 3-% degrees at any one point during hoisting and should have only one 1 80-degree reverse bend for each rope leaving the drum and reversing on the first or lead sheave on the load block with no other reverse bends other than at the equalizer if a sheave equalizer 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