Document: NUREG-0800
Document ID: bb1a5a83-5b12-456c-b141-1e450c066cff
Document Type: srp
Title: ONSITE METEOROLOGICAL MEASUREMENTS PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1818/ML18183A446.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.3
CFR Part: 
CFR Title: 

Content:
e), a finer wind speed category breakdown should be used for the lower speeds so data are not clustered in a few categories. "Calm" wind conditions (defined as wind speeds less than the starting speed of the anemometer or vane, whichever is higher) are checked for reasonableness. They should be identified in the joint frequency distributions as a separate wind speed class, without directional assignment for each atmospheric stability class. Data quality should be checked using the methodology in NUREG-0917 (Reference 14) or similar approaches. 2.3.3-14 Draft Revision 4 – September 2018 COL applicants referencing a standard design should choose meteorological measurement heights appropriate for the probable atmospheric release heights. As an example, a third measurement height above 60 meters may be implemented in situations where the stack releases exceed 85 meters or higher. Annual joint frequency distributions for each expected mode of release (ground level and elevated) are checked for appropriateness of the measurement heights for wind direction, wind speed, and atmospheric stability. Winds at the 10-meter level and the temperature difference (ΔT) between the vent height and the 10-meter level are used for vent and containment penetration or leakage releases. Winds from near release height and ΔT between release height and the 10-meter level are used for stack releases. ANSI/ANS-3.11-2015, EPA-454/R-99-005, and EPA-454/B-08-002 are sources of information that can be used during the review. 3. Review Procedures Specific to 10 CFR Part 52 Application Type a. Early Site Permit Reviews Subpart A to 10 CFR Part 52 specifies the requirements and procedures applicable to the Commission’s review of an ESP application for approval of a proposed site. Information required in an ESP application includes a description of the site characteristics and design parameters of the proposed site. The scope and level of detail for the review of this information parallels that