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: 42 of 175
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Occupational Radiation Exposure at NRC Licensed Facilities
As shown in Table 4.3, in 2010, there was a
1% increase in the net electricity generated at
LWRs. Fifty-five of the LWRs (53%) increased
power production in 2010. From 2009 to 2010,
Cook Unit 1 had the largest increase in power
production for PWRs, primarily because this
plant was in an extended outage for most of
2009 due to high vibrations in the low pressure
turbine. From 2009 to 2010, Perry had the
largest increase in power production for BWRs,
primarily because this plant had a long outage
in 2009 due to refueling, and repairs to cables
and the moisture separator reheater but
returned to full power production for almost all
of 2010. For PWRs, Crystal River 3 had the
largest decrease in power production from 2009
to 2010, as this plant had a refueling outage
that included a steam generator replacement in
2010. For BWRs, Grand Gulf had the largest
decrease in power production from 2009 to
2010, as this plant was online all year in 2009
but had a refueling outage in 2010.
4.2.3 Collective Dose per Megawatt-Year
The number of megawatt-years of electricity
generated was used in determining the ratio of
the average value of the annual collective dose
(TEDE) to the number of MW-yr of electricity
generated. The ratio was calculated by dividing
the total collective dose in person-rem by the
electric energy generated in MW-yr and is a
measure of the dose incurred by individuals at
commercial nuclear power reactors in relation to
the electric energy produced.
For the years 1973 to 1996, the electricity
generated is the gross electricity output of
the reactor. For 1997 to 2010, the number
reflects the net electricity produced. The ratio
of collective dose to the number of MW-yr
is calculated by year for BWRs, PWRs, and
LWRs, and is presented in Tables 4.1, 4.2, and
4.3. This ratio was also calculated for each
reactor site (see Appendix C). The average
collective dose per MW-yr for LWRs decreased
to a value of 0.09 rem/MW-yr in 2010 from a
value of 0.11 rem/MW-yr in 2009 due to the
combination of a 14% decrease in the collective
dose and a 1% increase in power production.
4.2.4 Average Maximum Dependable
Average maximum dependable capacity,
as shown in Tables 4.1, 4.2, and 4.3, was
calculated by dividing the sum of the net
maximum dependable capacities of the reactors
in megawatts (net megawatts electric [MWe]) by
the number of reactors included each year. The
net maximum dependable capacity is defined
as the gross electrical output as measured at
the output terminals of the turbine generator
during the most restrictive seasonal conditions
less the normal station service loads. This
"capacity" of each plant was found in Ref. 15.
4.2.5 Percent ofMaximum Dependable
The percent of maximum dependable capacity
achieved is shown for all LWRs in Table 4.3.
This parameter gives an indication of the
overall power generation performance of LWRs
as compared with the maximum dependable
capacity that could be obtained in a given year.
It is calculated by dividing the average electricity
generated per reactor by the average maximum
dependable capacity for each year.
The decrease in maximum dependable
capacity from 1996 to 1997 was due to the
change from measuring the gross electricity
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/m1/42/: accessed February 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.