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 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 should be provided in the design of the control systems for devices for emergency control or operations. Limiting devices, mechanical and electrical, should be provided to indicate and control or prevent overtravel and overspeed of hoist (raising or lowering) and for both trolley and bridge travel movements. Buffers for bridge and trolley travel should be included. r. Safety devices such as limit type switches provided for malfunction, inadvertent operation, or fail- ure should be in addition to and separate from the limit- ing means or devices provided for operation in the afore- mentioned. These would include buffers, bumpers, and devices or means provided for control of malfunction(s). s. The operating requirements for all travel movements (vertical and horizontal movements or rota- tion, singly or in combination) incorporated in the de- sign for permanent plant cranes should be clearly de- frned in the operating manual for hoisting and for trolley and bridge travel. The designer should establish the max- imum working load (MWL). The MWL should not be less than 85% of the design rated load (DRL) capacity for 1.104-7 -the n.w crane at time, of operation. The redundancy in design, design factors, selection of components, and balance of auxiliary-ancillary and dual items in the de- sign and manufacture will provide or dictate the maxi- mum working load for the critical load handling crane systems. The MWL should not exceed the DRL for the Overhead Crane Handling System. t. When the permanent plant crane is to be used for construction anid the operating requirements for construction are not identical to those required for pre- manent plant service, the construction operating require- ments should be completely defined separately. The crane should be designed