time definitions-reply

[Les Slaback <lester.slaback@nist.gov>]

Many licensees define time periods with tolerances, e.g.,
 1 quarter , no to exceed 4 months
 semi-annual, not to exceed 8 months
 annual, not to exceed 15 months

but you need to also make certain the overall frequency is maintained.
Quarterly is 4 times per year, 8 times per 2 years.  You cannot use the 4
month tolerance to turn it into 3 times per year.

Also note that if the frequency is explictly cited in a regulation, e.g.,
every 6 months, that cannot be changed by a license condition.
Disclaimer:  the above are the personal musings of the author, and do not
represent any past, present, or future position of NIST, the U.S. government,
or anyone else who might think that they are in a position of authority. 
Lester Slaback, Jr.  [Lester.Slaback@NIST.GOV] 
NBSR Health Physics 
Center for Neutron Research 
NIST 
Gaithersburg, MD  20899 
301 975-5810