Occupational Radiation Exposure at Commercial Nuclear Power Reactors and Other Facilities 2010, Prepared for the Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, May 2012 Page: 46 of 175
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Occupational Radiation Exposure at NRC Licensed Facilities
BWR collective doses have decreased by
approximately 21% and PWR collective doses
have decreased by approximately 36%.
In 2010, the average collective dose per reactor
for PWRs decreased by 20% to 55 person-rem
and the average collective dose per reactor for
BWRs decreased by 9% to 137 person-rem
from the 2009 values of 69 person-rem and 151
person-rem respectively. The average collective
dose per reactor for LWRs decreased by 14%
from 96 person-rem in 2009 to 83 person-rem
in 2010. This is the fourth year that the average
collective dose per reactor for LWRs has been
below 100 person-rem since tracking began in
1973. The overall decreasing trend in average
reactor collective doses since 1994 indicates
that licensees are continuing to successfully
implement as low as is reasonably achievable
(ALARA) dose reduction processes at their
facilities. In 2010, the number of individuals with
measurable dose per reactor decreased to 548
for PWRs and increased to 1,063 for BWRs.
Figures 4.2 and 4.3 are plots of most of the
other information that is given in Tables 4.1,
4.2, and 4.3. Table 4.3 shows that in 2010 the
net electricity generated decreased slightly to
92,134 MW-yr, while the number of operating
reactors has remained constant for the past
twelve years. Table 4.3 also shows that the
value for the total collective dose for all LWRs
decreased by 14% to 8,631 person-rem in 2010
from a value of 10,025 person-rem in 2009.
The average measurable dose per individual
remained the same at 0.12 rem in 2010 (not
adjusted for transient individuals).
The decrease seen in dose trends since
1994 may be attributable to several factors.
Utilities have completed the tasks initiated as
a result of the lessons learned from the 1979
TMI accident, and they are increasing efforts
to avoid and reduce exposure. The concept
of keeping exposures to ALARA levels is
continually being stressed, and most utilities
have established programs to collect and
share information relative to exposure control
processes, techniques, and procedures.
To further assist in the identification of any
trends that might exist, Figure 4.4 displays
the average and median6 values of the
collective dose per reactor for BWRs and for
PWRs for the years 1994 through 2010. The
median values are included here for statistical
completeness and are not used in other
sections of the report. The ranges of the values
reported each year are shown by the vertical
lines with a small bar at each end marking the
two extreme values. The rectangles indicate the
range of values of the collective dose exhibited
by those plants ranked in the 25th through the
75th percentiles. The median collective dose
for PWRs decreased from 56 person-rem in
2009 to 41 person-rem in 2010. The median
collective dose for BWRs decreased from
133 person-rem in 2009 to 123 person-rem
in 2010. Figure 4.4 also shows that, in 2010,
50% of the PWRs reported collective doses
between 32 and 63 person-rem, while 50% of
the BWRs reported collective doses between
88 and 188 person-rem. The middle 50% of
BWRs and PWRs in Figure 4.4 are the reactors
between the 25% and 75% dose range. These
values are based on an annual collective dose
6 The median is the value at which 50% of the reactors reported greater collective doses and the other 50% reported smaller
Forty-Third Annual Report, 2010
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McCormick, D. E. Lewis D. A. Hagemeyer Y. U. Occupational Radiation Exposure at Commercial Nuclear Power Reactors and Other Facilities 2010, Prepared for the Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, May 2012, report, July 7, 2012; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc839694/m1/46/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.