ISO 10645:2022
[Current]
Nuclear energy — Light water reactors — Decay heat power in non-recycled nuclear fuels
...ISO 10645:2022(E)
where
S
k
is the power density, in kilowatts per kilogram of uranium in the fuel;
a
eff
is the effective enrichment of fissile material which is calculated from the initial enrichment
a
0
, expressed as a percentage by mass...
...a
a
eff
=+
0
2
10 , (27)
For enrichments and burnups typical of LWRs,
k
in Formula (26) yields values of P
Cs
(t,T) which exceed
the exact values by up to 5 %...
...la (28)
Pt TH tP tT
S E
,, ()= () () (28)
yields conservatively high results, when using the factors H(t) from Table 8, provided that the following
boundary conditions are fulfilled:
initial enrichment, expressed as a percentage by mass, 1,9 % a
0
...
