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DOE-STD-3013-2000
Table B-6
Isotopic Mix and Heat Generation Rates in Various Grades of Plutonium
Weapon
Fuel
Power
Hanford
Hanford
Hanford
Nuclide
Pure
239
Pu
4-7%
10-13%
16-19%
238
Pu
0.05%
0.1%
1.0%
0.01%
0.09%
0.24%
239
Pu
100.0%
93.50%
86.1%
63.0%
93.77%
86.94%
80.66%
240
Pu
6.00%
12.0%
22.0%
6.00%
11.81%
16.98%
241
Pu
0.40%
1.6%
12.0%
0.20%
1.00%
1.44%
242
Pu
0.05%
0.2%
3.0%
0.03%
0.17%
0.69%
241
Am
0.14%
0.86%
2.80
Initial
1.93
2.53
3.15
8.95
2.46
4.02
7.20
SHGR,
w/kg
Maximum
1.93
2.81
4.48
18.5
2.61
4.72
7.92
SHGR,
w/kg
Figure B-4 shows how the heat generation rate changes with time for each of the materials
given in Table B-6, except for the power grade material. A chart showing the heat generation in
that is given in Figure B-5, where
it can be compared with the
8
7
Several characteristics are
6
immediately evident: 1) the
Pu-239
Weapons
5
maximum is very flat and broad;
Fuel
4-7%
4
2) the variation between initial
10-13%
16-19%
and maximum SHGR is a function
3
241
Pu content (and
of the initial
2
238
Pu content, although that
the
1
0
10
20
30
40
50
60
70
80
Years
is not as obvious); and 3) for the
Hanford material, the maximum
Figure B-4. Heat Generation rates in various grades of plutonium
as a function of time.
SHGR is only about 15% greater
than the initial SHGR. Figure B-5 provides an extreme example of the increase in SHGR with
time. This is due to the considerable buildup of 241Pu, representing a source of 241Am and
hence a future heat generation capability. Fortunately, the "power grade" curve is not
65

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