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:
tion and with the use of emergency operating controls and devices that have been designed into the handling system. The complete hoisting machinery should be allowed to "two block" during the hoisting test (load block limit and safety devices are bypassed). This test, conducted at slow speed without load, should provide assurance of the integrity of the design, the equipment, the controls, and the overload protection devices. The test should demonstrate that the maximum torque that can be developed by the driving system, including the inertia of the rotating parts at the overtorque condition, will be absorbed or controlled prior to two-blocking. The complete hoisting machinery should be tested for ability to sustain a load hangup condition by a test in which the load block attaching points are secured to a fixed anchor or excessive load. The drum should be cap- able of one full revolution before starting the hoisting test. c. The preventive maintenance program rec- ommended by the designer and manufacturer-4hkuld also prescribe and establish the MWL for which the crane will be used. The maximum working load should be plainly marked on each side of the crane for each hoist- ing unit. It is recommended that the critical load handling cranes should be continuously maintained at DRL capacity. d. The cold proof test provided for in regula- tory positions C.l b.3 and 4 should consist of a periodic 1.104-8 dumm% load test as follows: Metal temperature of the structural members, essential to the structural integri,ý of the crane handling system should be at or below the minimum operating temperature. The corresponding d*mmy load should be equal to 1.25 times the max- imum working load (MWL). If it is not feasible to ý,-.hive the minimum operating temperature during the test, the dummy load should be increased beyond the design rated load 1.5 percent per degree F temperature difference. ,Test frequency should be approximately 40 months or less; however, crane handling