Document: NRC Regulatory Guide
Document ID: 1ff1e9f9-6081-422a-b088-bc699514103c
Document Type: regulatory_guide
Title: Control of Heavy Loads at Nuclear Facilities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2100/ML21006A335.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.244
CFR Part: 
CFR Title: 

Content:
f heavy components above and around smaller structures (e.g., service water pump replacement through the roof of a water intake structure). The guidelines of Std. NML-1 use a risk-informed approach by qualitatively considering the probability and consequences of a load handling event during a planned lift to accommodate variations in safety significance and the associated controls applied to manage the risk of the lift. The probability of a load handling event is established by evaluating the handling system design, rigging configuration, and load characteristics. The potential consequences of a load handling event are classified considering the properties of the lifted load and the SSCs in the vicinity of the load path. The classifications are “standard lift,” “special lift,” and “critical lift,” with “nuclear safety critical lift” a subset of critical lift. Nuclear safety critical lifts encompass lifts that could challenge the continued performance of fundamental safety functions and are comparable to the scope of lifts the staff considered in developing NUREG-0612. Maintenance activities in which a load handling event could reduce the redundancy of equipment available to perform a fundamental safety function but could not directly prevent the accomplishment of the function may be classified as special lifts. DG - 1381, Page 7 of 16 The guidelines of ASME Std. NML-1 address the plans for conduct of normal handling system operations, including maintenance, surveillance, and periodic testing of handling system SSCs. These plans for normal operations include lift procedures; crane operator and rigger qualifications; crane inspection, testing, and maintenance; and selection and use of lifting devices not specially designed. These guidelines have been expanded to address the variety of load handling systems that may be used for safety-significant load handling evolutions. These guidelines provide an acceptable means of defining plans for conduct of