Document: NRC Regulatory Guide
Document ID: 6f0a99f2-d25a-44e3-b7f2-3286449a9752
Document Type: regulatory_guide
Title: Water Sources for Long-Term Recirculation Cooling Following a Loss-of-Coolant Accident (Rev. 5)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2126/ML21266A185.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.82
CFR Part: 
CFR Title: 

Content:
educe the exposure of bare metal surfaces (e.g., aluminum and uncoated carbon steel) to containment cooling water through spray impingement or immersion. These materials may be removed or protected by chemical-resistant systems (e.g., qualified coatings or jacketing). 1.1.3 Instrumentation and Operator Actions If a licensee relies on operator actions to mitigate the consequences of the accumulation of debris on the ECCS suction strainer, it should ensure that safety-related instrumentation that provides operators with an indication and audible warning of impending loss of NPSH for ECCS pumps is available in the control room. If a licensee relies on operator actions to prevent the accumulation of debris on ECCS suction strainers or to mitigate the consequences of the accumulation of debris on the ECCS strainers, it should evaluate whether operators have adequate indications, training, time, procedural guidance, and system capabilities to perform the necessary actions. 1.1.4 Inspection To ensure the operability and structural integrity of the ECCS strainers and associated structures, access openings may be necessary to permit their inspection, as well as that of the sump pits and pump suction piping inlets. Licensees should perform regular inspections (including visual examinations) of strainers, trash racks, vortex suppressors, and pump suction piping inlets for evidence of structural degradation, potential for debris bypass, and presence of corrosion or debris blockage. Licensees should conduct similar inspections for drainage flowpaths (e.g., refueling cavity drains and floor drains), debris interceptors, trash racks, and other design features upstream of the ECCS strainers that are credited in the strainer performance analysis. Inspection of the ECCS strainer, associated structures, and upstream components should be conducted late in a refueling outage to ensure the absence of debris generated by nearby construction or maintenance. 1.2 Evaluation of Alternative