Document: NUREG-0800
Document ID: be033a97-be2a-4a23-91fe-52b123162b3b
Document Type: srp
Title: LOW WATER CONSIDERATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730439.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.11
CFR Part: 
CFR Title: 

Content:
e effects to low water from other phenomena (including potential blockage of intakes by sediment, debris, littoral drift, and ice) are reviewed along with a complete history of low water conditions in the vicinity of the site and a thorough listing of types of phenomena, locations and durations of these events, and descriptions of hydrometeorological and hydrogeological characteristics accompanying these events that are sufficient to establish the history of low water phenomena in the vicinity of the site. Estimates of the most severe low water condition caused by failures of water control structures should be consistent with the analysis presented in SAR Section 2.4.4. Estimates of the most severe surge or seiche induced low water condition should be consistent with SAR Section 2.4.5. Estimates of the most severe tsunami induced low water condition should be consistent with SAR Section 2.4.6. Estimates of the most severe ice-induced low water condition should be consistent with SAR Section 2.4.7. If the site is susceptible to such phenomena, minimum water levels resulting from setdown (sometimes called runout or rundown) from hurricane surges, seiches, and tsunami should be higher than the intake design basis for essential water supplies. For coastal sites, the appropriate probable maximum hurricane (PMH) wind fields should be postulated to give maximum winds blowing offshore, thus creating a probable minimum surge level. Low water levels on inland ponds, lakes, and rivers due to surges should be estimated from probable maximum winds oriented away from the plant site. The same general analysis methods discussed in SRP Sections 2.4.5 and 2.4.6 are applicable to low water estimates due to the phenomena discussed. The potential for surges in intake sumps (i.e., seiching in intake structures and surges in intake pipes) that could cause adverse effects are reviewed to ensure that the effects have been properly accounted for in the intake design. The potential for