Document: 10 CFR Part 51
Document ID: d8bcfb7d-0cf8-4ae8-b37d-a39cc8f0604d
Document Type: cfr
Title: Definitions.
Source: 10 CFR Part 51
Source URL: https://www.ecfr.gov/current/title-10/part-51/section-51.4
Revision Date: 
Chapter: 
Section ID: 51.4
CFR Part: 51
CFR Title: 10

Content:
§ 51.4 Definitions. As used in this part: Act means the Atomic Energy Act of 1954 (Pub. L. 83-703, 68 Stat. 919) including any amendments thereto. Commission means the Nuclear Regulatory Commission or its authorized representatives. Construction means: ( 1 ) For production and utilization facilities, the activities in paragraph (1)(i) of this definition, and does not mean the activities in paragraph (1)(ii) of this definition. ( i ) Activities constituting construction are the driving of piles, subsurface preparation, placement of backfill, concrete, or permanent retaining walls within an excavation, installation of foundations, or in-place assembly, erection, fabrication, or testing, which are for: ( A ) Safety-related structures, systems, or components (SSCs) of a facility, as defined in 10 CFR 50.2 ; ( B ) SSCs relied upon to mitigate accidents or transients or used in plant emergency operating procedures; ( C ) SSCs whose failure could prevent safety-related SSCs from fulfilling their safety-related function; ( D ) SSCs whose failure could cause a reactor scram or actuation of a safety-related system; ( E ) SSCs necessary to comply with 10 CFR part 73 ; ( F ) SSCs necessary to comply with 10 CFR 50.48 and criterion 3 of 10 CFR part 50, appendix A ; and ( G ) Onsite emergency facilities ( i.e., technical support and operations support centers), necessary to comply with 10 CFR 50.47 and 10 CFR part 50, appendix E . ( ii ) Construction does not include: ( A ) Changes for temporary use of the land for public recreational purposes; ( B ) Site exploration, including necessary borings to determine foundation conditions or other preconstruction monitoring to establish background information related to the suitability of the site, the environmental impacts of construction or operation, or the protection of environmental values; ( C ) Preparation of a site for construction of a facility, including clearing of the site, grading, installation of drainage, erosion and other