Technical Basis for Employing Facility Ventilation Air Exchange Rates in the Decision to Downpost.

Mantooth, D. S.

Technical Information Center Oak Ridge Tennessee

关键词: Ventilation;    Air exchange rates;    Radioactive waste management;    Decision making;    Air sampling;   

RP-ID  :  DE2003807107

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

This document describes a method for utilizing the ventilation exchange rate as a basis for the decision to downpost a location within a facility from an airborne radiation area (ARA). The method is applicable when the ARA posting results from an initial air sample count that exceeds 10% of the applicable denved air concentration level (DAC) and the elevated activity is assumed to be due to (sup 220)Rn and (sup 222)Rn progeny. Under these conditions this method allows areas to be downposted substantially quicker than by other techniques. The method is not used in the case of a confirmed or suspected contamination release.