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:
seismic excursions. The design rated load plus operational and seismically induced pendulum and swinging load effects on the crane should be considered in the design of the trolley, andthey should be added to the trolley weight for the design of the bridge. d. All weld joints for load-bearing structures including those susceptible to lamellar tearing should be inspected, including nondestructive examination for soundness of the base metal and weld metal. e. A fatigue analysis should be considered for the critical load-bearing structures and components of the crane handling system. The cumulative fatigue usage factors should reflect effects of the cyclic loading from both the construction and operating periods. f. Preheat and postheat treat~nent (stress re- lief) temperatures for all weldments should be specified in the weld procedure. For low-alloy steel, the recom- mendations of Regulatory Guide 1.50, "Control of Pre- heat Temperature for Welding- of Low-Alloy Steels." should be applied. 2. Safety Features a. The automatic controls, and limiting de- vices should be designed so that, when disorders due to inadvertent operation, component malfunction, or dis- arrangement of subsystem control functions occur singly or in combination during the load handling and failure has not occurred in either subsystems or components, these disorders will not prevent the handling system from being maintained at a safe neutral holding position. b. Auxiliary systems, dual components, or an- cillary systems should be provided so that. in case of subsystem or component failure, ,the load will be retained and held in a stable or immobile safe position. c. Means should be provided for using the de- vices required in repairing, adjusting, or replacing the failed component(s) or subsystem(s) when failure of an active component or subsystem has occurred and the load is supported and retained in the safe (temporary) position with the handling system immobile. As an alter- native to