Document: NUREG-0800
Document ID: 217f75d5-3db3-41ce-939d-8f7a5fcf0f68
Document Type: srp
Title: feet 0.76 m (2.5 ft).   The applicant in Section 2.4.12 of the PSAR has described the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070262.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5
CFR Part: 
CFR Title: 

Content:
flow patterns during dewatering for the construction excavation is also necessary to verify assumed design bases relating to such factors as permeability and aquifer continuity. In addition, the final design of the system should be based on construction dewatering data and related observations to assure ensure that the values estimated from site exploration data are conservative. Lastly Finally, the final design of the dewatering system and 60 its hydrologic and geotechnical operational monitoring program should be confirmed by construction excavation and dewatering information. See (f) for considerations of differing system types. 1 DRAFT Rev. 3 - April 1996 2.4.12-20 If such information fails to support the conservatism of design information previously reviewed by the staff, the changed information should be reviewed under 10 CFR Part 50, Subsections 50.35(b) and 10 CFR 50.55(e)(1)(iii).61 (c) Provide analyses and their bases for estimates of groundwater flow rates in the various parts of the permanent dewatering system, the area of influence of drawdown, and the shapes of phreatic surfaces to be expected during operation of the system. The extent of influence of the drawdown may be especially important if a natural or manmade water body affects, or is affected by, the dewatering systems. (d) Provide analyses, including their bases, to establish conservative estimates of the time available to mitigate the consequences of system degradation that could 1 cause groundwater levels to exceed design bases. Document the measures that will be taken to either repair the system or provide an alternate dewatering system that would become operational before the design basis groundwater level is exceeded. (e) Provide both the design basis and normal operation groundwater levels for safety-related structures, systems, and components. The design basis groundwater level is defined as the maximum groundwater level used in the design analysis for dynamic or static loading