Environmental Engineering Reference
In-Depth Information
TABLE 11.2
Selected.Power.Uprates.in.the.United.States
Number
Plants
%Uprates
MW th
ApprovedYear
Type
1
Calvert.Cliffs.1
5.5
140
1977
S
2
Monticello
6.3
105
1998
E
3
Comanche.Peak.2
1
. 34
1999
MUR
4
ANO-2
7.5
211
2002
E
5
Match.1
1.5
. 41
2003
MUR
6
Susquehanna.1
13
463
2008
E
Note: Type:.S.=.Stretch;.MUR.=.measurement.uncertainty.recapture;.E.=.Extended.
Source: .
Data. from. U.S.. NRC. (Nuclear. Regulatory. Commission).. 2008.. Power.
uprates. for. nuclear. plants,. backgrounder.. Washington,. DC:. Ofice. of.
Nuclear.Reactor.Regulation.
TABLE 11.3
Power.Uprate.Expectations.in.the.United.States
Measurement
Uncertainty
Recapture
Uprates
Stretch
Power
Uprates
Extended
Power
Uprates
Total
Uprates
Expected
Thermal
Power
(MW th )
Fiscal
Year
2008
0
2
2
. 4
804
2009
0
5
6
11
1,966
2010
0
0
6
. 6
1,368
2011
0
0
2
. 2
895
2012
0
0
1
. 1
221
Total
0
7
17
24
5,254
Source: .
Data. from. U.S.. NRC. (Nuclear. Regulatory. Commission).. 2008.. Power.
uprates. for. nuclear. plants,. backgrounder.. Washington,. DC:. Ofice. of.
Nuclear.Reactor.Regulation.
from.0.001.to.1.based.on.the.power.uprate..This.is.used.for.the.power.uprates.
measures.(PUMs).expressed.as.a.percent.power.uprate.
Therefore,.in.Figure 11.5,.each.dot.is.increasing.linearly.up.to.a.10%.power.
uprate,. because. the. maximum. power. uprate. for. most. NPPs. is. 10%. for. the.
examples.in.Table.11.6..For.the.translation.of.the.igure.into.a.graph.of.the.
distribution. function. of. power. uprates. in. Table  11.6,. the. random. number.
selector.is.0.4.in.Calvert.Cliffs.1,.because.the.uprate.is.5.5%,.which.is.a.value.
between.5.0.and.5.9.
11.2.3 Refueling Factor (RF)
Security.of.an.NPP.is.extremely.important.during.a.refueling.period.because.
there.are.unexpected.fuel.losses,.so.this.period.is.considered.to.be.an.operational.
uncertainty..The.refueling.cycle.is.assumed.as.18.months..The.quantiications.
 
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