Document: NUREG-0800
Document ID: 332f67ca-c2d9-4259-bbfb-485a47724ddc
Document Type: srp
Title: REGIONAL CLIMATOLOGY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600393.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.1
CFR Part: 
CFR Title: 

Content:
n with respect to state and national ambient air quality standards. 6. Meteorological conditions identified as (1) site characteristics for ESP applications, (2) design and operating bases for CP, OL, and COL applications, and (3) site parameters for DC applications, including the following: a. The weight of the 100-year return period snowpack and the weight of the 48- hour probable maximum winter precipitation (PMWP) for use in determining the weight of snow and ice on the roofs of safety-related structures. b. The ultimate heat sink (UHS) meteorological conditions resulting in the maximum evaporation and drift loss of water, minimum water cooling, and, if applicable, the potential for water freezing in the UHS water storage facility. c. The tornado parameters (including maximum wind speed, translational speed, rotational speed, and maximum pressure differential with the associated time interval) to be used in establishing pressure and tornado missile loadings on structures, systems, and components (SSCs) important to safety. d. The 100-year return period (straight-line) 3-second gust wind speed to be used in establishing wind loading on plant structures. e. Ambient temperature and humidity statistics (e.g., 2% and 1% annual exceedance and 100-year maximum dry bulb temperature and coincident wet bulb temperature; 2% and 1% annual exceedance and 100-year maximum wet bulb temperature (non-coincident); 98% and 99% annual exceedance and 100- year minimum dry bulb temperature) for use in establishing heat loads for the design of normal plant heat sink systems, post-accident containment heat removal systems, and plant heating, ventilating, and air conditioning systems. f. All other regional meteorological and air quality conditions that should be classified as climatic site characteristics for ESP applications or used as design and operating bases for CP, OL, or COL applications. All references to FSAR sections in which these conditions are used should be identified by