Document: NUREG-0800
Document ID: 4f5104c1-f91e-4f7d-a8f7-b8b18e630618
Document Type: srp
Title: INTERNAL FLOOD PROTECTION FOR ONSITE EQUIPMENT FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550043.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.4.1
CFR Part: 
CFR Title: 

Content:
derate energy line breaks that are postulated in SRP sections 3.6.1 and 3.6.2. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with GDC 2 requires that SSCs important to safety be designed to withstand the effects of natural phenomena such as earthquakes, tornados, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. Meeting the requirements of GDC 2 is necessary to ensure that flooding due to failures of non-seismic piping does not affect the ability of the plant to shut down safely and remain in safe shutdown condition. The application of GDC 2 to this SRP Section 3.4.1-5 Revision 3 - March 2007 ensures that consideration is given to full-circumferential ruptures of non-seismic moderate energy piping. These ruptures are not considered in SRP Section 3.6.2, which only applies to normal conditions, not seismic events. However, internal flooding caused by seismically full-circumferential ruptures should be considered. 2. Compliance with GDC 4 for flood protection requires that SSCs important to safety being designed to accommodate the effects of and to be compatible with the environmental conditions associated with normal operation, maintenance, testing and postulated accidents, including loss-of-coolant accidents. Meeting the requirements of GDC 4 ensures that the SSCs important to safety will be appropriately protected from potential flooding from liquid-carrying components in the plant. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of