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:
lan for Category I structures, systems and components. However, all portions of the system need not be designed to accommodate all design basis events, such as earthquakes and tornadoes, provided that such events cannot either influence the system or that the consequences of failure from such events is not important to safety; nevertheless, a clear demonstration of the effectiveness of a backup system and the timeliness of its implementation must be provided; (b) The potential for localized pressures developing in areas which are not in contact with the drainage system, or in areas where pipes enter or exit the structural walls or mat foundations, must be considered. (c) Uncertainty in detecting operational problems and providing a suitable monitoring system must be considered; (d) The potential for piping fines and clogging of filter and drainage layers must be considered; 2.4.12-19 DRAFT Rev. 3 - April 1996 (e) Assurance must be provided that the system as proposed can be expected to reliably perform its function during the lifetime of the plant; and (f) Where the system is safety related, is not totally redundant, or is not designed for all design basis events, provide the bases for a technical specification to assure ensure that in the event of system failure, necessary remedial action can be implemented before design basis conditions are exceeded. V. SARs (Standard Format & Content Information, Sections 2.4 & 2.5) for each of the plants with permanent dewatering systems should include the following information: (a) Provide a description of the proposed dewatering system, including drawings showing the proposed locations of affected structures, components, and features of the system. Provide information related to the geotechnical and hydrologic design of all system components such as interceptors, drainage blankets, and previous fills with descriptions of material source, gradation limits, material properties, special construction features, and placement and