Document: NUREG-0800
Document ID: 3921f96a-d11f-4926-8200-7a9d08ba29cc
Document Type: srp
Title: PROBABLE MAXIMUM SURGE AND SEICHE FLOODING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340539.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.5
CFR Part: 
CFR Title: 

Content:
neers (Ref. 32). Reports of NOAA and the Corps of Engineers are used to estimate probable maximum wind fields over the Great Lakes. Models such as Platzmann's, or other verified models, may be used to estimate the maximum surge or seiche stillwater elevation *Based on the difference between normal water levels and the flood event. 2.4.5-3 Rev. 2 - July 1981 for Great Lakes sites; coincident wind-generated waves and runup are estimated as above. Two-dimensional models (References i7, 28, and 44) include seiching effects. Seiching potential is evaluated using one-dimensional models by comparing the natural period of oscillation (resonance) of the water body with the estimated meteorologically-induced wave periods. Resonance of a water body may be cal- culated by the methods presented in Reference 32 or standard texts. Generally, a demonstration that the water body cannot generate or sustain waves of the required period for resonance is satisfactory to discuss the possibility of damaging seiching. Similarly, seismically induced seiching is precluded if the natural period of oscillation of the water body is dissimilar from the period of precluded seismic excitation. Coordination with the Geosciences Branch (GB) to determine the controlling seismic parameters may be required. If resonance is possible, the maximum seiche must be considered in the selec- tion of the critical flood design bases. The above reviews are performed only when applicable to the site or site region. Some items of review may be done on a generic basis. IV. EVALUATION FINDINGS For construction permit (CP) reviews the findings will summarize the applicant's and staff's estimates of critical water level (including wind-generated wave levels) at the site. If the estimates meet the criteria (described in subsection II above), staff concurrence will be stated. If the applicant's estimates do not meet the criteria in subsection II above, and the-proposed plant may be adversely affected, a statement