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:
the purpose of promoting a limited movement. 4That point in the lowest range of movement control at which power is on, brakes are off, and motors are not energized. motion of the overnead brsage crane shouui nut exceea 110% of the calculated horsepower requirement at maxi- mum speed with design rated load attached. Incremental or fractional inch movements, when required, should be provided by such items as variable speed or inching motor drives. Control and holding brakes should each be rated at 100% of maximum drive torque at the point of application. If two mechanical brakes, one for control and one for holding, are provided, they should be ad- justed with one brake in each system for both the trolley and bridge leading the other and should be activated by release or shutoff of power. The brakes should also be mechanically tripped to the "on" or "holding" position in the event of a malfunction in the power supply or an overspeed condition. Provisions should be made for manual operation of the brakes. The holding brake should be designed so that it cannot be used as a foot-operated slowdown brake. Drag brakes should not be used. Oppo- site wheels on bridge or trolley that support bridge or trolley on their runways should be matched and have identical diameters. Trolley and bridge speed should be limited. A maximum speed of 30 fpm for the trolley and 40 fpm for the bridge is recommended. q. The complete operating control system and provisions for emergency controls for the overhead crane handling system should be located in the main cab on the bridge. Additional cabs located on trolley or lifting devices should have complete control systems similar to the bridge cab. Manual controls for hoisting and trolley movement may be provided on the trolley. Manual con- trols for the bridge may be located on the bridge. Re- mote control or pendant control for any of these mo- tions should be identical to those provided on the bridge cab, control panel. Provisions and locations