Document: NUREG-0800
Document ID: 48fb37ec-8e3e-4c2c-96c3-daa5e7da62f9
Document Type: srp
Title: of the applicant's SAR is reviewed to identify any missing data,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340557.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.12
CFR Part: 
CFR Title: 

Content:
drainage designs 2. 4.12-5 Rev. 2 - July 1981 would be adopted in the event that the current design parameters are found to be substantially changed, as determined during construction excavation. For example, if the site soils or rocks are found to be more permeable, causing an increase in the design discharge, modifi- cations such as increased pump size, or other designs would be implemented. The applicant has also agreed that the final design will be based on data gathered during the construction excavation, if the current design bases are inadequate. We have reviewed the applicant's plans for providing monitoring pro- grams 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 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 4. The applicant had already considered the effects of 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 accidently released