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:
ystem(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 repairing the crane in place, means may be provided for safely moving the immobilized handling system with load to a safe laydown area that has been designed to accept the load while the repairs are being made. d. The design of the crane and its operating area should include provisions that will not impair the safe operation of the reactor or release radioactivity when corrective repairs, replacements, and adjustments are being made to place the crane handling system back into service after component failure(s). 3. Equipment Selection a. Dual load attaching points (redundant de- sign) should be provided as part of the load block assem- bly which is designed so that each attaching point will be able to support a static load of 3W (W is weight of the design rated load) without permanent deformation of any part of the load block assembly other than localized strain concentration in areas for which additional mate- rial has been provided ror wear. b. Lifting devices that are attached to the load block such as lifting beams, yokes, ladle or trunnion type hooks, slings, toggles, and clevises should be of re- dundant design with dual or auxiliary device or combina- tions thereof. Each device should be designed to support a static load of 3W without permanent deformation. c. The vertical hoisting (raising and lowering) mechanism which uses rope and consists of upper sheaves (head block), lower sheaves (load block), and rope reeving system, should provide for redundantly de- signed dual hoisting means. Maximum hoisting speed should be no greater than 5 fpm. d. The head and load 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