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:
of drain outlets in the sump will provide assurance that the zoned filter, drains, and pumps are functioning properly. Seismic Category I manholes, located along the exterior walls of the reactor and auxiliary buildings, will provide access to the perforated pipe in the zoned wall filter for inspection and cleanout. These manholes can be used for temporary installation of pumps in the unlikely event that groundwater rises in the wall drains. An inspection and monitoring procedure will be developed for both the construction and operation phase of the plant. Several observation wells will be located at strategic locations to monitor groundwater levels in the vicinity of the shield and auxiliary buildings and will be used to verify that the groundwater drawdown is effected as predicted and to establish its extent of influence in the yard area. These wells will be monitored periodically during construction for a sufficient period to verify that a steady-state condition has been achieved. The details of the operational monitoring program will be provided during the operating license stage of our review. The applicant states that design parameters used to size the dewatering system and to establish the monitoring program will be verified during construction excavation. The applicant has agreed that the currently proposed system would be modified or other groundwater drainage designs 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, modifications 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. DRAFT Rev. 3 - April 1996 2.4.12-10 We have reviewed the applicant's plans for