Document: NUREG-0800
Document ID: 4e1c316a-99c2-4fd3-9d9b-323791bd85f8
Document Type: srp
Title: SHORT-TERM ATMOSPHERIC DISPERSION ESTIMATES FOR ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730398.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.4
CFR Part: 
CFR Title: 

Content:
distributions should be adequately described. Guidance for calculating EAB and LPZ atmospheric dispersion factors is provided in Regulatory Guide 1.145. 5. Atmospheric dispersion factors used for the assessment of consequences related to atmospheric radioactive releases to the control room for design basis, other accidents, and for onsite and offsite releases of hazardous airborne materials should be provided. Guidance for calculating control room χ/Q values for radiological releases and hazardous material releases is provided in Regulatory Guide 1.194 and Regulatory Guide 1.78, respectively. 6. For control room habitability analysis, a site plan drawn to scale should be included showing true North and potential atmospheric accident release pathways, control room intake, and unfiltered inleakage pathways. 2.3.4-6 Revision 3 - March 2007 Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with GDC 19 requires that the control room remain functional so that actions can be taken to operate the nuclear power unit safely under normal conditions and maintain the plant in a safe state under accident conditions. Adequate radiological and airborne hazardous material protection must be provided to permit access and occupancy of the control room for the duration of accidental conditions. Atmospheric dispersion estimates are significant inputs in assessments performed to demonstrate compliance with GDC 19. Guidance for determining atmospheric dispersion estimates for control room habitability during radiological accidents and hazardous material accidents is provided in Regulatory Guide 1.194 and Regulatory Guide 1.78, respectively. Meeting the requirements of this criterion provides assurance that those personnel needed to monitor and control an accident will be able to function effectively. 2. 10 CFR 100.11(a) specifies for reactor