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Re: LSA


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The best explanation I've seen is in the NRC Inspection Manual, Temporary 
Instruction 2515/133, "Implementation of Revised 49 CFR Parts 100-179 and 10 
CFR Part 71."  Paragraph 4.02e, page 9, states that, "In the definition of 
LSA, a distinction is made between the terms 'essentially uniformly 
distributed' and 'distributed throughout.'  The term 'essentially uniformly 
distributed' is intended to be more restrictive than 'distributed throughout.' 
 Both terms are intended to disallow LSA classification for a material with 
very high radioactivity (such as a leaking sealed source) in one location and 
a large quantity of non-radioactive material surrounding it, thereby reducing 
the average concentration to within specified limits..."   
 
It should be noted that DOT issued a correction to 49 CFR 173, in a Federal 
Register Notice of May 8, 1996, which revises the LSA definitions to use 
"distributed throughout" for LSA-II and LSA-III, but retains "essentially 
uniformly distributed" for LSA-I.   
 
 
Bill Lipton 
The opinions expressed are strictly mine.


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Subject: LSA
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Any insights as to why NRC revised part 71
to use the term 'distributed throughout'
intead of the DoT term 'essentially 
uniformly distributed'? see 61FR28723
dated 6/6/96.

A little risk adds spice to life.
slaback@MICF.NIST.gov


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