Document: NUREG-0800
Document ID: 57051ec2-9a01-488e-8294-573ed557f3eb
Document Type: srp
Title: GROUNDWATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070262.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.12
CFR Part: 
CFR Title: 

Content:
nal design will be based on data gathered during the construction excavation, if the current design bases are inadequate. DRAFT Rev. 3 - April 1996 2.4.12-10 We have reviewed the applicant's plans for providing monitoring programs during construction and operation and his commitment to notify the staff and to appropriately modify the design if measurements show significantly higher groundwater flows than assumed for the preliminary design. We conclude that this meets the requirements of 10 CFR Part 50, §50.55(e)(1)(iii) with respect to the dewatering system. We find that the 41 monitoring program will provide sufficient data for design input and conclude that an acceptable design, in compliance with 10 CFR Part 50, §50.55a, can be provided for the measured groundwater flow. In addition to the capability of the permanent dewatering system to handle normal groundwater flow, we asked the applicant to consider the effects of accidents and natural phenomena on the capability of the permanent dewatering system in compliance with General Design Criterion (GDC) 4. The applicant had already considered the effects of 42 infiltration of rainfall within the radius of influence assuming blockage of discharge pipes from the wall drains to the sump in the auxiliary building, but had not considered the effects on the sump in the absence of such blockage. In considering accidents that could release fluids within the radius of influence, the applicant concentrated his assessment on a large source of water, the condenser circulating water system, and on sources that could be accidental released directly into the wall drain. The applicant states that the failure of a circulating water system pipe inside the turbine building would cause water to be ponded to a depth of 13 feet 4 m (13 ft) above the turbine 43 building floor. The wall of the adjacent auxiliary building facing the turbine building will be constructed as a seismic Category I wall up to a level of 13 feet 6 inches 4.1 m