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: 5 of 175
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This report summarizes the occupational exposure data that are maintained in the U.S. Nuclear
Regulatory Commission's (NRC) Radiation Exposure Information and Reporting System (REIRS).
The bulk of the information contained in the report was compiled from the 2010 annual reports
submitted by five of the seven categories of NRC licensees subject to the reporting requirements of
10 CFR 20.2206. Because there are no geologic repositories for high-level waste currently licensed
and no NRC-licensed low-level waste disposal facilities currently in operation, only five categories
will be considered in this report. The annual reports submitted by these licensees consist of
radiation exposure records for each monitored individual. These records are analyzed for trends and
presented in this report in terms of collective dose and the distribution of dose among the monitored
Annual reports for 2010 were received from a total of 190 NRC licensees. The summation of reports
submitted by the 190 licensees indicated that 192,424 individuals were monitored, 81,961 of whom
received a measurable dose (Table 3.1).2 When adjusted for transient workers who worked at more
than one licensee during the year, there were actually 142,471 monitored individuals and 62,782 who
received a measurable dose (See Section 5).
The collective dose incurred by these individuals was 10,617 person-rem, which represents a 12%
decrease from the 2009 value. This decrease was primarily due to the decrease in collective dose
at commercial nuclear power reactors, as well as a decrease in the collective dose for most of the
other categories of NRC licensees. The number of individuals receiving a measurable dose also
decreased, resulting in an average measurable dose of 0.13 rem for 2010. The average measurable
dose is defined as the total effective dose equivalent (TEDE) divided by the number of individuals
receiving a measurable dose.
In calendar year 2010, the average annual collective dose per reactor for light water reactor (LWR)
licensees was 83 person-rem. This represents a 14% decrease from the value reported for 2009 (96
person-rem). The decrease in collective dose for commercial nuclear power reactors was due to an
11% decrease in total outage hours in 2010. During outages, activities involving increased radiation
exposure such as refueling and maintenance are performed while the reactor is not in operation.
The average annual collective dose per reactor for boiling water reactors (BWRs) was 137 person-
rem for 35 BWRs, and 55 person-rem for 69 pressurized water reactors (PWRs).
Analyses of transient individual data indicate that 29,333 individuals completed work assignments
at two or more licensees during the monitoring year. The dose distributions are adjusted each year
to account for the duplicate reporting of transient individuals by multiple licensees. The adjustment
to account for transient individuals has been specifically noted in footnotes in the figures and tables
for commercial nuclear power reactors. In 2010, the average measurable dose per individual for all
licensees calculated from reported data was 0.13 rem. Although the average measurable dose per
individual from data submitted by licensees was 0.13 rem, a corrected dose distribution resulted in
an average measurable dose per individual of 0.17 rem.
1 Commercial nuclear power reactors and test reactor facilities, industrial radiographers; fuel processors (including uranium
enrichment facilities), fabricators, and reprocessors; manufacturing and distribution of byproduct material; independent spent
fuel storage installations; facilities for land disposal of low-level waste; and geologic repositories for high-level waste. There are
currently no NRC licensees involved in low-level waste disposal or geologic repositories for high-level waste.
2 The number of individuals with measurable dose includes any individual with a dose greater than zero rem and does not include
doses reported as "not detectable."
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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. (https://digital.library.unt.edu/ark:/67531/metadc839694/m1/5/?rotate=180: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.