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:
plant safety, we have always required that they be designed and used in a con- servative manner. The following is a list of required design provisions which are consistent with requirements in recent CP reviews: (a) If the dewatering system is relied upon for any safety-related func- tion, the system must meet the appropriate criteria of Appendix A and Appendix B to 10 CFR Part 50. In addition, guidance for struc- tural, mechanical and electrical design criteria is provided in related sections of the Standard Review Plan 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 earth- quakes and tornados, 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 implemen- tation 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; (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 that in the event of system failure, necessary remedial action can be implemented before design basis conditions are exceeded. 2.4.12-14 Rev. 2 - July 1981 V. SARs (Standard Format & Content Information, Sections 2.4 & 2.5) for each of the plants with permanent