Document: NRC Regulatory Guide
Document ID: b143ccef-ed08-482d-bc4b-b4e012328090
Document Type: regulatory_guide
Title: Applications for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1523/ML15233A056.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.206
CFR Part: 
CFR Title: 

Content:
ation. Therefore, the facility design will determine whether intake structures and related components are within the scope of construction. Cooling Towers Depending on the plant design, it is possible for an applicant to demonstrate, similar to that for intake structures, that cooling tower structures do not have a safety function. This conclusion may not apply to related SSCs, such as pumps associated with the CWS, because there are examples of plant transients and safety system actuations that have loss of circulating water flow as an initiating event. To expand the preconstruction activities beyond the cooling tower structure, applicants need to perform design-specific reviews to ensure that a loss of circulating water system flow caused by loss of pumps or other components is not a plausible initiating event for a reactor scram or safety system actuation. Therefore, the facility design will determine whether cooling towers and related components are within the scope of construction. Turbine Building Structure or Foundation The turbine/generator system is within the scope of construction because failure of the turbine/generator could cause a reactor scram. However, depending on the plant design, it is possible for an applicant to demonstrate that a plausible failure of the turbine building structure or foundation (settling) would not result in a reactor scram or safety system actuation. Depending on the facility design, the turbine building structure or foundation may not fall within the scope of construction, if the reactor scram or safety system actuation criterion is the only reason to consider it. Temporary or Permanent Features This section addresses the distinction between temporary and permanent construction features (e.g., retaining walls and dewatering systems). As discussed in the supplementary information for the final LWA rule, excavation and other site preparation activities, whether permanent or temporary, are outside the scope of construction and