Document: NUREG-0800
Document ID: dc7fdaed-8abd-4b49-b5df-dcf64a9b93b0
Document Type: srp
Title: SHORT-TERM DISPERSION ESTIMATES FOR ACCIDENTAL ATMOSPHERIC
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070235.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.3.4
CFR Part: 
CFR Title: 

Content:
ric conditions, y z 2.3.4-3 DRAFT Rev. 2 - April 1996 should be related to measured meteorological parameters. The methodology for establishing these relationships should be appropriate for estimating the consequences of accidents within the range of distances which are of interest with respect to site characteristics and established regulatory criteria. 4. Cumulative probability distributions of relative concentrations (X/Q) should be constructed to describe the probabilities of these X/Q values being exceeded. All cumulative probability distributions of X/Q should be presented for appropriate distances (e.g., the exclusion area boundary distance and the outer boundary of the low population zone) and time periods as specified in Section 2.3.4.2 of Regulatory Guide 1.70, "Standard Format and Content of Safety Analysis Reports for Nuclear Power Plants." The methods of generating these distributions should be adequately described. 5. Relative concentrations used for assessment of consequences of atmospheric radioactive releases for design basis and other accidents, and for onsite and offsite releases of hazardous airborne materials. Technical Rationale11 The technical rationale for application of these acceptance criteria is discussed in the following paragraphs:12 1. Compliance with GDC 19 concerning personnel radiation exposures inside the control room during design basis accident conditions requires radiation protection such that exposures are limited to 50 mSv (5 rem) or less to the whole body, or its equivalent to any part of the body, during access and occupancy for the duration of the accident. A radiation dose associated with access and occupancy of the control room under accident conditions is specified so that personnel assigned to monitor and control the accident will be able to perform these functions without concern for their personal health and safety. Guidance on evaluation of control room habitability during accidents is provided in Regulatory Guide