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:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of plant design for protection of structures, systems, and components from internal and external hazards Secondary - Organization responsible for hydrology reviews I. AREAS OF REVIEW The review of the plant internal flood protection includes all structures, systems, and components (SSCs) whose failure could prevent safe shutdown of the plant or result in uncontrolled release of significant radioactivity. The facility design and equipment arrangements presented in the applicant's safety analysis report (SAR) are reviewed with respect to both internal (e.g. pipe break, tank failure) and external (e.g. failure of exterior tanks) causes. The review of external flood protection from natural phenomena (e.g. probable maximum flood, tsunami, etc.) is performed in a separate review as listed in the Review Interfaces subsection of this Standard Review Plan (SRP) Section. The specific areas of review are as follows: 1. The safety-related SSCs that must be protected against flooding from both external and internal causes. 3.4.1-2 Revision 3 - March 2007 2. The location of the safety-related SSCs relative to the internal flood level in various buildings, rooms, and enclosures that house safety-related SSCs. 3. Possible flow paths from interconnected non-safety-related areas to buildings, rooms, and enclosures that house safety-related SSCs (e.g., leakage through interconnecting doorways). 4. The adequacy of the isolation of safety-related systems and equipment between redundant trains and from non-safety systems that could be sources of internal flooding. 5. Provisions for protection against possible in-leakage sources, such as non-mechanistic cracks in structures and exterior openings and penetrations in structures located at a lower elevation than the internal flood level. 6. SSCs that could be a potential source of internal flooding (e.g. pipe breaks and cracks, tank and vessel failures, backflow