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:
.C. tIcularly useful ,n evaluating the need for an early revision 20555. Attention: Director. Office of Standards Development. generally available to industry is appended to this guide. The applicable requirements of these standards and re- commendations should be used to the maximum extent practical to obtain quality construction. Where dif- ferences or conflicts in interpretation exist between the codes, standards, or recommendations, use of the most stringent requirement is recommended. However, special features should be added to prevent and control or stop inadvertent operation and malfunction of the load- supporting and -moving components of the handling system. When an overhead crane handling system will be used during the plant construction phase prior to its intended service in the operating plant, separate perfor- mance specifications are needed to reflect the duty cycles and loading requirements for each service. At the end of the construction period, changes to the crane system may be required to reflect the specifications for the permanent operating plant condition. For example, if the specifications for the size of the hoist drive motor differ sufficiently for the two applications, the motor and the affected control equipment would have to be replaced or changed for the operating plant phase. Fea- tures and functions needed for the cranes during the plant construction period are not considered in this guide except where the use of the crane may influence its design and operation for the permanent plant opera- tion. Overhead cranes may be operating at the time when an earthquake occurs. Therefore. the cranes should be designed to retain control of and hold the load, and the bridge and trolley should be designed to remain in place on their respective runways with their wheels prevented from leaving the tracks during, a seismic event. If a seismic event comparable to a safe shutdown earthquake (SSE) occurs, the bridge should remain immobile on the runway,